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| operating and service manual 20T4G18 model 1008254-501 part number serial number http://
model 20T4G18 2 http:// ec declaration of conformity w e ; am plif ier research 160 school house road souderton, pa 18964 declare that our product; the model 200t4g18 am plifier to which this declaration relates is in com p liance with the requirem e nts of the eec emc directive (89/336/eec) and low voltage directive (73/23/eec) in accordance with the relative standards listed below: emc: en 50082-1: 1992 electrom a gnetic com p atibility ? generic im m unity standard en 50081-1: 1992 electrom a gnetic em issions requirem e nts for industrial, scientific, and medical (ism) equipm ent saf e ty: en 60950 (1995) the ce m a rking is affixed on the device according to the ec directives. donald r. shepherd president http:// m odel 20T4G18 4 http:// instructions for safe operation before applying power safety symbols thi s sy m bol i s m a rked on t h e equi pm ent when it is necessary for the user to refer to th e m a n u a l fo r im p o r tan t safety in fo rm atio n . dangerous voltages are present. use extrem e care. caution : the caut i on sy m bol denot es a potential hazard. attention m u st be given to the statem ent to prevent dam a ge, destruction, or harm . indicates protective earth term inal. rev i ew this ma nua l a nd beco me fa milia r with a ll sa fety markings and instructions. verify that the equipment line voltage selection is compatible with the main power source. protection provided by the equipment may be impaired if used in a manner not specified by amplifier research. intended purposes thi s equi pm ent i s i n t e nded for general l a borat ory use i n a wi de vari et y of i ndust r i a l and sci e nt i f i c appl i cat i ons. it i s desi gned t o be used i n t h e process of generat i ng, cont rol l i ng, and m easuri ng hi gh l e vel s of el ect rom a gnet i c r a di o frequency (r f) energy . therefore, t h e out put of t h e am pl i f i e r m u st be connect ed t o an appropr iate load such as an antenna or field-generating devi ce. it is the responsibility of the user to assu re th at th e d e v i ce is o p e rated in a lo catio n wh ich will co n t ro l th e rad i ated en erg y su ch th at it will n o t cau se in j u ry an d will n o t v i o l ate reg u l ato r y lev e ls o f electro m a g n e tic interference. range of environmental conditions thi s equi pm ent i s desi gned t o be safe under t h e fol l o wi ng envi ronm ent a l condi t i ons: haz ardous rf voltages ? indoor use ? altitude up to 2000m the r f vol t a ges on t h e cent e r pi n of t h e r f out put connect or can be hazardous. the rf out put connector should be connected to a load before ac p o w er is ap p lied to th e am p lifier. do n o t co m e in to co n t act with th e cen ter p i n o f th e rf output connector or accessori es connected to it. place the equipm ent in a non-operating c ondition before disconnecting or connect i ng t h e l o ad t o t h e r f out put connect or. ? tem p erat ure of 5c t o 40c ? max i m u m relativ e h u m id ity 8 0 % fo r tem p eratu r es u p to 31c . decreasi ng l i n earl y t o 50% at 40c . ? main supply voltage fluctuations not to exceed 10% of t h e nom i n al vol t a ge or m i ni m u m and m a xi m u m aut o rangi ng val u es. ? pol l u t i on degree 2: norm al l y non-conduct i v e wi t h occasional condensation. w h ile the equipm ent will not cause hazardous condition over this environm ental range, its perform ance m a y vary . safety ground thi s equi pm ent i s provi ded wi t h a prot ect i v e eart h t e rm i n al . the m a i n power source t o t h e equi pm ent m u st suppl y an uni nt errupt ed safet y ground of suffi ci ent si ze t o t h e i nput wi ri ng t e rm i n al s, power cord, or suppl i e d power cord set . the equi pm ent must not be used if th is p r o t ectio n is im p a ired . cooling air c a re shoul d be exerci sed not t o bl ock t h e cool i ng ai r i n l e t s or out l e t s . c ool i ng ai r bl ockage can resul t i n dam a ge t o t h e r f am p lifier o r in term itten t sh u t -d o w n s . physical damage the r f am pl i f i e r shoul d not be operat e d i f t h ere i s phy si cal dam a ge, m i ssi ng hardware, or m i ssi ng panel s . maintenance caution adjust m e nt , m a i n t e nance, or repai r of t h e equi pm ent m u st be perform ed only by qualified personnel. hazardous energy m a y be present whi l e prot ect i v e covers are rem oved from t h e equi pm ent even i f di sconnect ed from the power source. contact m a y result in personal injury. replacem ent fuses are requi red t o be of speci fi c t y pe and current rat i ng. http:// m odel 20T4G18 2 http:// additional warnings & notes warning: this equipm ent operates at potentially lethal voltages. only trained, qualified personnel should operate, maintain, or service it. haz a rdous energy may be present while protective covers are removed from the equipment even if disconnect ed from the power source. contact may result in personal injury. caution: adjustment, maintenance, or repair of the equipment must be performed only by qualified personnel. caution: replacement fuses are required to be of specific type and current rating. caution: the information in this document wa s obtained from reliable sources and was believed to be accurate at the time of publication. since subsequent modifications to the machine may have been made, use this information only as a guide. carefully compare the unit's actual configuration and operation to the descriptions in this manual before you undertake to operate, service, or modify this mach ine. any variance or modification should be noted, dated, and initialed in the discrepant part of all manuals on hand for future reference. if you have technical or editorial comments you wish to make to the manufactu rer, please write them on photocopies of the relevant sheets. note: the contents of this document are the prop erty of the manufacturer and this document is delivered on the express condition that it not be disclosed, reproduced in whole or in part, or used for manufacture for anyone other than the manufacturer without its written consen t, and that no right is granted to disclose or so use any information in this document. http:// model 20T4G18 4 http:// t able of contents table of co ntents .................................................................................................. i 1. description and spe cifications .............................................................. 1 1.1 t w t a d e s c r i p t i o n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 suggested applications .............................................................................................. 1 1.3 specifications ............................................................................................................. 1 1.4 accessori es ................................................................................................................. 1 1.5 test data sheet .......................................................................................................... 2 2. theory of op eration ..................................................................................... 5 2.1 design of the am plifier ............................................................................................... 5 2.2 description of the rf circuit ..................................................................................... 5 2.3 description of the power supply ............................................................................... 6 3. o p e r a t i o n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.1 warnings and cautions .............................................................................................. 7 3.2 installation .................................................................................................................. 8 3.2.1 unpacking ............................................................................................................... 8 3.2.2 mounting ................................................................................................................. 8 3.2.3 cooling requirem e nts ............................................................................................. 9 3.2.4 ac line power connections ................................................................................. 10 3.2.5 rf output connections ......................................................................................... 10 3.2.6 external interlock connector ................................................................................ 10 3.3 front panel features ................................................................................................. 11 3.4 front panel display and soft key s .......................................................................... 12 3.5 rear panel features .................................................................................................. 16 3.6 initial turn on and warm -up procedure ................................................................. 16 3.7 em ergency by pass operation .................................................................................. 17 3.8 rem o te ieee-488 operation ................................................................................... 18 3.9 twta general considerations ................................................................................ 23 4. mainte nance ..................................................................................................... 25 4.1 safety warning ........................................................................................................ 25 4.2 unauthorized repairs ............................................................................................... 25 4.3 preventive maintenance ........................................................................................... 25 4.4 troubleshooting ....................................................................................................... 26 4.5 non-repairable modules ......................................................................................... 27 5. technical docum entation ...................................................................... 29 5.1 top level build tree ............................................................................................... 30 5.2 schem a t i c s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.3 wiring diagram s ...................................................................................................... 33 5.4 parts lists ................................................................................................................. 35 5.4.1 parts list, hpa logic and control module, a16485-000 .................................... 36 5.4.2 parts list, power supply (short) for twt 5172, a23720-099 ........................... 38 5.4.3 parts list, em ergency by pass board, a24830-001 .............................................. 39 5.4.4 parts list, em ergency by pass board, a24830-002 .............................................. 40 5.4.5 parts list, hpa interface board (plastic), a25444-000 ....................................... 41 i http:// m odel 20T4G18 5.4.6 parts list, hpa 20w 4.2-18ghz (ar), a28825-300 .......................................... 44 5.4.7 parts list, microwave power assem bly , a r , a 2 8 8 2 6 - 0 0 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 5.5 recom m e nded spare parts ....................................................................................... 46 5.6 sam p le program for ieee-488 com m unication ...................................................... 47 illustrations figure 3-1 - rear view of hpa .......................................................................................... 9 figure 3-2 - twta front panel features ......................................................................... 11 figure 3-3 - front panel display screens .......................................................................... 12 figure 3-4 - twta rear panel features ........................................................................... 15 tables table 1 - front panel features ............................................................................................. 9 table 2 - rear panel features ............................................................................................ 15 table 3 - catalog of ieee-488 com m a nds ....................................................................... 17 table 4 - catalog of status codes ..................................................................................... 18 table 5 - catalog of fault codes ....................................................................................... 19 table 6 - catalog of sy stem state codes .......................................................................... 19 table 7 - catalog of *sta?; response codes .................................................................. 20 table 8 - catalog of *stb?; response codes .................................................................. 20 ii http:// 1. description and specifica t ions this manual provides operating, interfacing and sel ected service information pertinent to amplifier research model 20T4G18 broadband microwave amp lifier. the model 20T4G18 is a 20 watt c/i/j band traveling-wave tube am plifier (twta). 1.1 twta description the am plifier uses a broadband m i cro- traveling-wave tube (twt) to provide 20 watts m i nim u m output over the twt am plifier' s full bandwidth. the am plifier is well suited for susceptibility and general laboratory testing where instantaneous bandwid th and high gain are required. the am plifier is com p letely self-contained and packaged for standard 19-inch rack m ounting or bench top use. the front panel of the rack m ountable am plifie r is 5.25 inches high, and the overall unit is 25.25 inches deep, excluding the rear-panel connectors. for bench top use, the am plifier is supplied in an enclosure with integral carry ing handles. prim ary power is 99-260 volts 50-60 hz., single phase. an efficient switching power supply design provides m i nim u m power consum ption. a fast regulation control loop and a high degree of filtering ensure perform ance within specifications over a wide range of operating conditions. the am plifier is fully enclosed, and the upper and lower panels of the rack m ountable am plifier are interlocked to reduce the likelihood of accidental contact with high voltage. 1.2 suggested applications ? rf susceptibility testing ? antenna and com ponent testing ? equipm ent calibration ? general laboratory instrum e ntation 1.3 specifications refer to the am plifier research data sheet on the following pages for detailed specifications. 1.4 accessories am plifier research offers a num ber of accessori es for use with this am plifier including: ? directional coupler ? antenna ? flexible transm ission line refer to a current am plifier research catalogue for microwave accessories. rev b 1 http:// m odel 20T4G18 1.5 test data sheet a test data sheet for a specific unit is prepared at the tim e of m a nufacture and is included with the unit' s copy of this m a nual. 2 rev b http:// 1 60 s c ho o l h o u s e r oad , s o ud er t o n, p a 1 896 4 - 9 990 u s a p hon e 215 - 723 - 8 1 8 1 ? f a x 21 5- 7 23-568 8 model 20T4G18 m1, m2 20 watts cw 4.2 - 18 ghz the model 20T4G18 is a self contained, forced air cooled, broadband traveling wave tube (tw t ) m i crowave am plifier designed for applications wh ere wide instantaneous bandwidth, high gain and m oderate power output are required. a reliabl e m i cro tw t provides a conservative 20 watts m i nim u m at the am plifier output connector. stat ed power specifications are at fundam e ntal frequency. the am plifier' s front panel digital display shows fo rward and reflected output plus extensive system status inform ation accessed through a series of m e nus via soft keys. status indicators include power on, warm -up, standby, operate, faults, excess reflected power warning and rem o te. standard features include a built-in ieee-488 (gpib) interface, 0db m input, vsw r protection, gain control, rf output sam p le port, auto sleep, plus m onitoring of tw t helix current, cathode voltage, collector voltage, heater current, heater voltage, baseplate tem p erature and cabinet tem p erature. modular design of the power supply and rf com ponents a llow for easy access and repair. use of a switching m ode power supply results in significant weight reduction. housed in a stylish contem porary cabinet this un it is designed for benchtop use but can be rem oved from the cabinet for rack m ounting. the model 20t 4g18 provides readily available rf power for a variety of applications in test and measurem ent, (including emc rf susceptibility testing), industrial and university research and developm ent, and service applications. 0 20 40 60 watts 2 4 6 8 10 12 14 16 18 20 frequency (ghz) 20T4G18 typical power output cw linear @ 1db compression rev111804 http:// specifications model 20T4G18 power (fundamental), cw , @ output connector n o min al ........................................................................................................... 42 watts m i n imu m ......................................................................................................... 20 watts lin e ar @ 1db comp r e s s i on ............................................................................ 10 watts min imu m flatn e s s ......................................................................................................... 9 db maximu m , 4.2 - 18 ghz 5db maximum, 8.0 - 18 ghz freq u e n c y res po n s e ................................................................................ 4.2 - 18 g h z in s t an tan e ou s l y i n put for rated output ......................................................................... 1.0 milliwatt maximu m gai n (at maximu m s e ttin g) ............................................................................... 43 db min imu m g a i n ad ju s t m e n t (con tin u o u s r a n g e) ........................................................ 35 db min imu m i n pu t i m p ed an ce ......................................................................................... 50 oh ms , vs w r 2.0:1 ma ximum o u tpu t i m p ed an ce ..................................................................................... 50 oh ms , vs w r 2.5:1 typic al mismatch tolerance ............................................................................... outp ut power foldback protect ion at r e flected power exceedin g 20 watts. will operate with ou t damage or oscillation with any magnitu de and phase of source and load imp edance. may oscillate with unshie l de d ope n due to c o upling to input. should not be tes t ed with con n ector off. modulation capability .......................................................................... will faith fully reproduce am, f m, or pulse modulation appearing on the input signal. am peak envelope power limited to specified power. noi s e pow er dens i t y ................................................................................ m i n u s 80 dbm/hz (maximu m) minus 90 dbm/hz (typical) harm o n i c d i s t o r ti o n (at 20 watts ) ......................................................... 4. 2-4.5g hz ; m i n u s 0dbc maximu m, minus 1dbc typical 4.5-5ghz; minus 1dbc maximum, minus 2dbc typical 5-7ghz; minus 2.5dbc maximum, minus 4dbc typical 7- 10 ghz; minus 5dbc maximum, minus 9dbc typical 10 - 12 ghz; minus 8dbc maximum, minus 12dbc typical above 12 ghz; minus 20dbc maximum, minus 30dbc typical primary powe r ............................................................................................ 99-260 vac 50/60 hz single phase, 600 va maximumn connectors rf in pu t ....................................................................................................... type n female on rear panel rf ou tpu t ..................................................................................................... type tn c female on rear panel rf ou tpu t s a mple por t ................................................................................. type n fe male on r e ar p anel gpib ............................................................................................................ i eee-488-(f) i n ter l ock ...................................................................................................... d b -15 female o n rear panel co o l i n g ........................................................................................................... fo r ced air ( self contained fans), air entry and exit in re ar. model configuration model number description weigh t size (h x w x d) 20T4G18 w ith rem o vable enclosure 32 kg ( 70lb) 50. 3 x 16. 5 x 68. 6 cm 19. 8 x 6. 5 x 27 in 20t 4g18m 1 enclosure rem o ved f o r rack m o unting, slides and f r ont handles installed 25 kg ( 55lb) 48. 3 x 13. 3 x 68. 6 cm 19. 0 x 5. 25 x 27 in 20t 4g18m 2 shipped without an outer cabi net 23 kg ( 50lb) 48. 3 x 13. 3 x 68. 6 cm 19. 0 x 5. 25 x 27 in http:// 2. theor y of opera t ion 2.1 design of the amplifier the m odel 20T4G18 twt am plifier consists of four principal subsy s tem s . two of these subsy s tem s , the m i crowave power assem bly (a28826-000) and the twt power supply (a23720-099) are discussed in sections 2.2 and 2.3, respectively . the other two subsy s tem s are the m i croprocessor c ontrol sy stem and the twta packaging. these both consist of a num ber of subassem blies. see the build tr ee in section 5.1 for further inform ation about how the parts lists are structured. the heart of the m i croprocessor control sy stem is th e control head assem bly (a25403-302), which consists of the cpu board (a25450-000), the hpa display board (a25425-001), and the data link board (a22488). the m i croprocessor control sy stem supervises the power supply , provides m e tering display , processes operator front panel inputs, and enables com m unication with a host com puter over the ieee-488 interface. the control head is provided with its own power suppl y and, other than thru the ieee-488 interface bus, is electrically isolated from the am plifier. com m unication w ith the am plifier is via fiberoptic links to the hpa interface assem bly (a25444-000). the twta packaging consists of cabinet assem bly (a28827-000). the cooling sy stem utilizes a dc blower with a dedicated dc power supply . 2.2 description of the rf circuit the twta consists of two stages of rf am plificati on: a solid state pream p assem bly with adjustable gain (e01122-000) and a traveling-wave tube am plifier (e08137-000). the ty pe n rf input connector is located on the rear panel. the rf input is fed to the input connector on the solid state pream p. the solid state pream p' s output driv es the rf input of the twt. the rf output of the twt is a ty pe tnc coaxial connector. the output is directed through a short cable to a -35/-35 db dual directional coupler. the output tnc connector of the c oupler protrudes through the rear panel of the twta to function as the rf output connector. the reverse port on the directional coupler is connected to a cry s tal detector, whose output is used for vswr protection by the power supply logic board, for vswr m easurem e nt in the leveling loop, and for reverse power m easurem e nt on the hpa interface board. the forward port output is split by a -10 db coupler. the direct output is connected to a cry s tal detector via a pad. the output of the cry s tal detector is used on the hpa interface board to m easure forward power. the side port of the coupler is connected to the rf sam ple port on the rear panel. with an optional reverse power sam ple port on the rear panel, an additional ?10 db coupler is connected to the reverse port of the sy stem ?s dual directional coupler. the output port of the ?10 db c oupler is connected to a detector diode whose output is used on the hpa interface board to m easure reflected power and for vswr foldback and protection. the coupled port of the ?10 db coupler is connected to the reverse power sam ple port on the rear panel. rev b 5 http:// m odel 20T4G18 am plifier gain is determ ined by the solid state pream p (ssa), which has a voltage-controlled attenuator. the control head determ ines the output of a digital-to-a nalog converter (dac) on the hpa interface board. the output of the dac controls the ssa attenuator. th e em ergency by pass board (a24830) m ounted behind the front panel is provided with a circuit that increases the attenuation so that forward power is lim ited to a level on the order of 50 watts. forward power is also lim ited so that reverse power does not exceed approxim a tely 20 watts. in em ergency by pass operation (see section 3.7) th e gain control signal is provided locally by m eans of a potentiom e ter on the em ergency by pass board. the fo ldback circuit rem a ins on line in em ergency by pass operation. 2.3 description of the power supply the twt power supply is of m odular construction. lo w voltage power for logic and control of the entire power supply assem bly is provided by the low voltage power supply m odule (a23687-001). in addition this m odule provides dc power for the hpa interface and em ergency by pass boards. control logic and twt protection circuits are contained in the hpa logic and control assem bly (a16485-000). the heater power supply module (a10010-000) powers the twt dc heater. the micro- twt requires no separate grid or anode supply . the high voltage power supply consists of the follo wing: the power factor correction m odule (a23683-100) converts line voltage to dc for the high voltage sw itching supply . switching transistors are on the power board assem bly (a23710-000), and switching is controlle d by the pulse width modulation (pwm) board (a10017-100). the high voltage transform e r and rectifie rs are contained in the high voltage diode/cap assem bly (a21457-001). the high voltage dc is filtered in the hv filter assem bly (a21454). low voltage interconnects between the power supply m odul es are through a m o therboard. it is installed in a finned heat sink assem bly to which the m odules are bolted. the heat sink is cooled by the incom i ng cabinet air. the heat sink/motherboard assem bly is a23711-000. 6 rev b http:// 3. opera t ion 3.1 warnings and cautions throughout this m a nual, the sy m bol: warning: indicates that a hazard exists that m a y r esult in personal injury or loss of life. caution: indicates that failure to follow pro cedures m a y result in dam a ge to the equipm ent. warning: danger - high voltage present: electrical equipment in this twta generates and stores high-voltage energy that can result in fatal electro cution. do not operate the twta with covers or the front panel removed. service work must be performed only by technicians thoroughly familiar with the high-voltages present in microwave tube amplifiers in general, and with this equipment in particular. never handle the twt leads or the high-voltage connectors unless the unit has been unplugged and it has been positively established that the high-voltage filter capacitors have been discharged to a known safe level. warning: safety ground improper grounding of this equipment can result in electric shock. the twta must be operated only with a line cord with a safety ground wire. it is the user's responsibility to ascertain that the power connector is properly wired and that the power outlet is grounded. warning: explosive atmosphere to avoid explosion, never operate this twta in an explosive atmosphere. this equipment is not certified for op eration in an explosive atmosphere. rev b 7 http:// m odel 20T4G18 3.2 installation 3.2.1 unpacking upon receiving the twta, unpack the unit and inspect it fo r obvious signs of external dam a ge. if dam a ge is observed, notify the carrier and contact an authorized service representative. save and store the shipping container in case the unit need s to be returned in the future for calibration or repair. 3.2.2 mounting the twta m a y be operated as a standalone benchtop unit, or it m a y be installed in a 19" rack. if rack m ounting is desired, first rem ove the am plifier from the cabinet, then install the am plifier in the rack. caution: due to the weight of the unit, the rem oval of the am plifier from the cabinet or rack is a two person operation. before rem oval disconnect power, rf, and any other interf ace connectors. on the rear of the unit, rem ove the six screws used to connect brackets to am plifier. on th e front of the unit, rem ove the four screws holding the front panel to the cabinet. carefully slide th e am plifier out of the front of the cabinet. caution: never rack mount the twta using the front panel alone. the chassis is likely to be damaged unless its weight is supported. bottom support rails must be provided in a rack mount configuration. see figure 3-1 (on the next page) for the locations of threaded holes which m a y be used for supplem entary support of the rear of the twta. 8 rev b http:// m odel 20T4G18 us e 8- 32 f h sc r e ws , 3/ 8- 1/ 2" thr e a d i n c a b i ne t to a tta c h r e a r s u p p o r t b r a c k e t s h e r e (b o t h si de s) 100 - 2 5 5 v a c sa f e t y gr oun d 50/ 60 h z . 500 v a ex t e r n a l in t e r l o c k rf i n p u t 0 d b m ma x rf o u t p u t ty p e tn c rf s a m p l e o u t ac p o w e r i n ieee - 4 8 8 23. 675 0. 8 6 5 3. 5 0 figure 3-1. rear view of hpa, rack mounting configuration if bottom supports are used for rack m ount installation of m u ltiple units, the am plifiers should be separated vertically by at least 1 3/4 inches. this will allow room for necessary support rails and facilitate installation and rem oval of the units. 3.2.3 cooling requirements the twta is provided with a cooling fan. it is im por tant that air m ovem e nt around the rear of the unit be unobstructed. caution: for either bench or rack mounting, do not position the twta in such a way that the air intake or outlet are blocked, or that the exhaust flow is directed into the intake. see paragraph 3.5 for location of air intake and air outlet. if the unit is rack mounted, make sure that the intake air is 45c or below. if necessary, fabricate a short duct to direct the hot exhaust air out of the rack enclos ure. great care must be taken to minimiz e any flow restrictions. avoid mounting heat-producing equipment in the same rack, especi ally below the twta. failure to provide adequate cooling can result in the unit's shutting down from overtemperature conditions. the twta dissipates approxim a tely 500 watts when in the operate m ode. rev b 9 http:// m odel 20T4G18 3.2.4 ac line power connections ac line power connection to the twta is m a de at th e ac inlet j1, which is a fem a le iec-320 connector. a line cord suitable for the ty pe of ac outlet used, and c onsistent with local electrical codes, m u st be obtained to m a te with j1. minim u m wire size for the line cord is 18 gauge. twtas destined for the north am erican m a rket are provi ded with a term inated 3-wire cord. it plugs into norm a l 120 vac single phase outlets. the am plifier w ill operate from any line voltage between 99 and 260 vac. 3.2.5 rf output connections the rf output coaxial connector is ty pe tnc fem a le. caution: never operate the twta without a matched output load rated for at least 100 watts, continuous. the twta is not provided with an output isolator. full reflected power may irreparably damage the twt. even with no drive, ?looping? oscillation can result in rf output high enough to dam age the tube if it is operated without a load. the vswr detection and foldback circuit is provided to protect the tube from progressive failure or m i sm atch of the output load; it should not be relied on for protection from the absence of a load. if an external isolator is installed at the output of the twta, either the isolator should have a load capable of dissipating the full output of the twta or the isolator load should be provided with a tem p erature sensing switch. the tem p erature switch should be norm a lly clo sed, self-resetting, and with a tem p erature rating such that there is no possibility of dam a ging the load by overheating before the switch opens. the twta m a y be interlocked with the switch by connec ting it between pins 3 and 4 of the ex ternal interlock connector (j2). if no external isolator is used, install a jum p er between pins 3 and 4. see section 3.2.6, external interlock connector, below. 3.2.6 external interlock connector the twta is provided with an external interlock capability via a 15-pin fem a le d-sub connector, j2. to enable the high voltage power supply , it is necessary to provide continuity between j2 pins 3 and 4. if the am plifier shuts down because the interlock was opened, it will be necessary to reset the sy stem to return to standby (see system shutdown screen in section 3.4). there is an internal jum p er between j2 pins 1 and 2; a continuity check through these pins can be used to veri fy the presence of the am plifier in the instrum e ntation sy stem . users m a y adopt this interlock feature to disable the rf output for either equipm ent protection or as a backup for personnel protection. caution: do not rely on the external interloc k for personnel protection. the intent of the external interlock feature is to disable the rf output for equipment protection. use proper operating and safety procedures to insure that power is removed for personnel safety. 10 rev b http:// m odel 20T4G18 3.3 front panel features refer to figure 3-2 below. s t a ndby 11 1 6 78 po w e r ma in in h i b i t re m o t e lo c a l exi t 10 12 9 5 3 2 m o d e l 2 0t 4g 18 20 w a t t s 4. 2 - 18 g h z op er a t e 4 figure 3-2. front panel features table 1. front panel features ite m t i t l e func t i o n 1 main power sw itchable 16 a. circuit breaker; connects primary pow er to pow er supplies. 2. operate push-button; turns on high voltage and ssa w hen all faults and heater delay are cleared. 3. standby push-button; shuts off ssa and turns off high voltage. 4. adjust rotary knob used as an input device to change values of a variety of parameters. 5. exit push-button; terminates various menu selecti on routines and returns to the previous menu level. 6-9. s1...s4 ?soft key ? push-buttons ; various menu selection functions. 10. display display s numerous par ameter values and fault messages. 11. key l ock sw itch allow s operator to inhibit the twta, to enable front panel control, or to enable computer control. 12. emergency sw itch cover provides access to emergency by pa ss sw itches, w h ich permit manual control of the amplifier. rev b 11 http:// m odel 20T4G18 3.4 front panel display and soft keys the purpose of the front panel display is to perm it the operator to access extensive inform ation about the condition and operation of the twta. to accom p lis h this, a num ber of inform ational screens are program m e d. it is im portant for the operator to be ab le to select the screen with the required inform ation. screen selection is accom p lished by pressing an appropria te soft key or by pressing the exit key . when a soft key is active, its function is display e d on the bo ttom line of the display . figure 3-3 provides a ?roadm ap? for navigating between the screens. figure 3-3. front panel display screens menu screens - the screens at the highest level are called m e nu screens. there are four m e nu screens. at power on, the menu 1 screen is display e d. each of th e m e nu screens has the soft key s4 labeled more. the more key (s4) causes the next m e nu screen to app ear. from menu 4, more causes menu 1 to reappear. in short, more perm its scrolling through the m e nu scr eens. the exit key returns display to menu 1 from any other m e nu screen. the m e nu screens display sy stem status and param e ter levels. they are configured as follows: 12 rev b http:// m odel 20T4G18 menu 1 forw ard pow er (w atts, dbm or bar graph) reverse pow er (w atts, dbm or % of forw ard pow er) sy stem status (if a latched fault exists, menu 1 is display ed w i th the sy stem shutdow n message) menu 2 console hours (active w hen ac pow er is on) operate hours (active w hen hv is on) menu 3 cabinet temperature (c or f) twt baseplate temperature (c or f) menu 4 heater voltage (ef) heater current (if) collector voltage (eb) cathode voltage (ek) hel i x c u rrent (iw ) help screens - on each of the m e nu screens, soft key s3 is labeled help. if s3 is selected, a m essage describing the functions of that screen will be display e d. use the adjust knob to scroll through the m essage. the exit key will return y ou to the screen from which the help screen was called. setup screens - from menu 2, s1 (labeled setup) selects th e first of several setup screens, setup 1. this allows the user to m a nually shut off the heater power supply and put the hpa into ?sleep mode? (see below). pressing s1 (set) toggles between on and off. pressing more again brings up the setup 2 screen, which allows the user to change the auto sleep mode tim er setting. pressing set will change the tim er options in half hour increm ents from 0.5 to 3.0 hours. pressing more again will save the tim er setting and bring up the setup 3 screen, which toggles the display of tem p erat ure param e ters between fahrenheit and celsius degrees. pressing s1 (set) changes the selection. the setting display e d when the screen is exited will be retained. pressing more again brings up the setup 4 scr een, which allows a choice of display i ng forward power in watts, dbm or bar graph. pressing more a th ird tim e brings up setup 5, which allows a choice of watts, dbm , or % of forward power for display i ng re verse power. more brings up setup 6, which allows entering the desired num ber of alarm beeps and th e desired beep volum e. s1 (set) toggles between param e ters, and the adjust knob is used to enter the da ta. setup 7 allows the ieee-488 address to be set. setup 8 allows selecting between pulsed or cw operation. the set button toggles between the two. more returns y ou to setup 1. exit returns y ou from any of the setup screens to menu 2. sleep m ode - the sleep mode feature allows the user to selectively shut off the heater m odule of the power supplies. this can be done m a nually through the front pane l or rem o tely via the com puter interface. this is ty pically used during extended periods of remote operation to im prove tube life, by turning off the filam e nts (sleep mode activated). this elim inates excessi ve standby hours on the twts while still perm itting rem o te capability to turn on the am plifier. to activate sleep mode locally : press the more soft key to get to menu 2. at me nu 2 press the setup soft key to get to setup 1. at setup 1 press set to activate sleep mode (turn heater and fan off). the sy stem will ask ?are y ou sure?? press set again. after activating the sleep mode: screen will display ?cooling on? while heaters cool down. ?sy s tem off? notifies user that the am plifier is in sleep mode rev b 13 http:// m odel 20T4G18 to deactivate sleep mode locally : press the on soft key to de-activate sleep mode. am plif ier will return to menu 1. when de-activating the sleep mode the heaters will require approxim a tely a 5 m i nute heater tim e delay . wait the full 5 m i nutes prior to selecting operate. for rem o te activation of sleep mode or to set the auto sleep mode tim er rem o tely see table 3 in section 3.8. warnings screens - from menu 3, s1 (labeled warnings) selects warnings 1 which allows the operator to enter the m a xim u m forward power. the ex isting value is between brackets[ ] ; pressing set puts arrows >< around the value, indicating that the adjust knob is active. the effect of the warning setpoint is as follows: if the forward power exceeds the setpoint, the audible alarm will sound (if configured in setup 3). this warning will be repeated every thirty seconds until the over forward power condition is cleared. in addition, a warning m essage will appear on line 3 (the stat us line) of menu 1. in the event that the alarm is heard, the operator should go to menu 1 to determ ine the cause. pressing m o re brings up warnings 2, which allows the under forward power setpoint to be entered. adjusting this to the m i nim u m value causes -o ff- to be selected, disabling this alarm . in warnings 3, the m a xim u m reverse power level is set. note that these are warning levels at which the beep sounds; the actual m a xim u m reverse power level that generates a sy stem fault is set in hardware in the twt power supply hpa logic and control m odule (a16485). more brings up warnings 4, which allows input of the m a xim u m cabinet tem p erature. entering this param e ter is perform ed as above. more brings up warnings 5, identical to the previ ous screen except that it deals with the m a xim u m twt collector block tem p erature. if either param e ter exceeds the setpoint, the audible alarm will sound every 30 seconds (if configured), and a warning m essage will appear on line 3 of menu 1. from warnings 5, more brings up warnings 6, which perm its setting the m a xim u m helix current. any helix current above this setpoint will result in an audible alarm (if configured), repeated every 30 seconds; and a warning m essage is display e d on the status line of menu 1. pressing more again returns display to warnings 1. as before, pressing exit from any of the warnings screens returns display to menu 3. info screen - from menu 2, s2 (labeled info) selects a scr een that display s the rf sam ple port calibration factors at various frequencies across the band. in add ition, this screen display s the m odel num ber, serial num ber and firm ware revision inform ation which m a y be required by a service representative when providing technical assistance. the exit key returns the display to menu 2. event screen - from menu 4, s2 (labeled event) provides a display of events logged by the control sy stem . these events include ac power-up, heater wa rm -up, change from standby to operate, faults, and resets. the events are stored in a first-in-first-out (f ifo) software buffer that has room for 100 events; as new events are logged, the older ones are discarded. system shutdown screen - in the event of a sy stem shutdown due to a latched fault (i. e., a fault such as body overcurrent or power low line that requires a reset), the menu screen is replaced by a screen indicating the nature of the fault. softkey s4 (labeled ok) is im plem ented as a reset key ; pressing s4 brings back the menu screens. line 3 of menu 1, which norm a lly display s the operational state of the twta, is used as a fault display line until the fault is cleared. when the fault clears the sy stem will autom a tically resum e the standby state and high voltage on will be enabled once again. 14 rev b http:// m odel 20T4G18 factory service screens - a num ber of screens intended for factory service and calibration are behind passwords and are not accessible to the user. system malfunction screens - a num ber of screens are reserved to display error m essages. these m essages are not norm a lly seen and indicate a m a lfunction of the twta. sy stem m a lfunction m essages include the following: database corrupt com m unication failure cannot restore cu line voltage too low to operate. sy stem shutdown in the event that one of these appears, shut off th e twta and contact an authorized service representative before proceeding. caution: attempts to operate the twta despite control unit problems may result in loss of the static ram databa se and calibration information. rev b 15 http:// m odel 20T4G18 3.5 rear panel features see figure 3-4 below figure 3-4. rear panel features table 2. twta rear panel features ite m t i t l e func t i o n 1. ac power in ac pow er i nput connector: iec-320 connector 2. ieee-488 remote control connector: 24 pin hermaphrodite 3. external interlock connector to remote temperature sw itch protecting the isolator load: d-sub 15-pin female 4. ? cooling air intake. 5. ? cooling air outlet. 6. rf input rf input; n female connector 7. forward sample rf sample ty pe n (female) 8. reverse sample rf sample ty pe n (female) - o p tio n al 9 rf output rf output: tnc female connector 3.6 initial turn on and warm-up procedure install the twta as discussed in section 3.2 provide an rf generator to the rf input ty pe n connector a1j1. set rf generator level below -50 dbm and set desired frequency in specified range. connect a load suitable for 100 watts continuous operation to the output waveguide. the load vswr should be less than 2.0:1 a power m e ter and suitable attenuators m a y be c onnected to the rf sam ple port a1j2. (refer to rf sam ple port calibration factors on the rear of the unit or on the info screen in menu 2). these show the relation between the am plifier output power and the rf sam ple port power as a function of frequency . when only the power of the fundam e ntal frequency is to be m easured and when operating near rated power use; filters, a frequency selective receiver, or a spectrum anal y zer to reduce the harm onic content of the m easured level. 16 rev b http:// m odel 20T4G18 set key l ock to local. switch on the main power circuit breaker. the fan will operate. the front panel display will show several identification m essages and then the menu 1 screen. the th ird line will indicate that the heater tim e delay is active. allow the heater warm -up delay to expire. line three will indicate off/ready. push s4 (more) three tim es to go to menu 4. verify that the heater voltage and current are near their nom inal levels. the values of these param e ters at the tim e the twta left the factory are logged on the test data sheet. push the operate push-button. you will now see the cathode and the collector voltages rise. verify that the collector and cathode voltages are near nom inal. the helix current should be close to the nom inal value for no rf drive. then push more or exit to go back to menu 1. set the twta gain to m a xim u m . adjust the rf genera tor to slowly increase the rf drive toward 0 dbm to reach the desired fwd pwr on the display and power m e ter (connected to sam ple port). the forward power bar graph will becom e active, with m a xim u m length wh en peak power output is achieved. best perform ance is obtained when the input rf drive is set at or ju st below the level which causes peak power output. do not set input drive above 0 dbm (input drive above +20 dbm m a y dam a ge the unit).the reverse power level should rem a in below 10% of the forward power, assum i ng that the load is properly m a tched. an alternate procedure is to pre-set the twta gain to m i nim u m , set the rf generator to 0 dbm and then slowly increase the twta gain to set the desired rf output level. observe that the helix current is sens itive to the rf drive level of the twt. it is at a m i nim u m with no rf drive. the helix currents with no drive and with rate d rf output m i d-band are logged on the test data sheet. the value of the helix current is a good qualitative indicator of rf drive present. to shut the sy stem down, turn down the rf genera tor level below -50 dbm and press standby. allow the twta to cool down until the twt tem p erature drops below 70c, then turn off m a in power 3.7 emergency bypass operation for reference, see schem atic 10-24830-002 in section 5.2. the twta is provided with a m eans of operating the am plif ier m a nually in the event that there is a failure of the control m odule and it is im perative that the am plifier rem a in on line. caution: emergency bypass operation disabl es certain protective and diagnostic features. for this reason, the emergen cy bypass mode of operation should be used only when the control unit fails and when it is essential to remain on line. to access the m a nual controls, rem ove the two 4-40 scr ews securing the em ergency switch cover on the front panel. em ergency by pass m ode is selected by pushing th e left-hand switch (s1) to the left. the center switch (s2) toggles between high voltage on (left) and high vo ltage off (right). the right-hand switch (s3) selects between solid state am plifier (ssa) active (rf on) in th e left hand position, and ssa off (rf off) in the right- hand position. there is a m a nual control for the gain adjust m e nt as well. this is a flat, square single-turn pot (r1). rev b 17 http:// m odel 20T4G18 caution: do not adjust 20-turn pot r11; its function is to set the foldback rf output level, and it is calibrated at the factory. 3.8 remote ieee-488 operation the twta is provided with a com m unication interface th at conform s electrically to the ieee-488 standard. it perm its rem o te em ulation of operate, standby, and reset push-buttons as well as access to param e ter m easurem e nts, sy stem faults, gain adju stm e nt, and control unit status. the following tables sum m a rize the com m a nds and the return codes. table 3. catalog of ieee-488 commands 18 rev b comma n d f u n c t i o n units re s pons e forma t rdstat returns status code of processing of previous command (see table 4) status=[ ] rdflt returns sy stem fault code (see table 5) flt=[ ] o perate; emulates o perate push-button standby ; emulate standby push-button power:off; emulate standby push-button reset; emulates reset softkey rds/n returns serial number s/n=[ ] rdconhr returns console hours conhr=[ ] rdrfhr returns rf hours rfhr=[ ] rdek returns cathode voltage kv ek=[ ] rdeb returns collector voltage kv eb=[ ] rdef returns heater voltage v ef=[ ] rdif returns heater current a if=[ ] rdiw returns helix current ma iw =[ ] rdtmptw tf returns tw t temp (f) f tw tf=[ ]f rdtmptw tc returns tw t temp (c) c tw tc=[ ]c rdtmppsf returns pow er supply temp (f) f psf=[ ]f rdtmppsc returns pow er supply temp (c) c psc=[ ]c rdtw t otf returns tw t ov ertemp w a rni ng s e tpoi nt (f) f tw totf=[ ]f stwtotf sets twt overtemp w a rning setpoint (f) f rdtwtotc returns twt overtemp w a rni ng setpoint (c) c twtotc=[ ]c stwtotc sets twt overtemp w a rning setpoint (c) c rdpsotf returns pow er supply overtemp w a rning setpoint (f) f psotf=[ ]f spso tf sets p. s. overtemp w a rning setpoint (f) f rdpsotc returns p. s. overtemp w a rning setpoint (c) c psotc=[ ]c spso tc sets p. s. overtemp w a rning setpoint (c) c rdiwoc returns helix overcurrent w a rning setpoint ma iw oc=[ ] siwoc sets helix overcurrent w a rning setpoint ma rdlogic returns logic state code (see table 6) sy s=[ ] rda returns gain % a=[ ] s a s e t s g a i n % http:// m odel 20T4G18 comma n d f u n c t i o n units re s pons e forma t rdhtdrem returns remaining heater time delay sec. htd=[ ]s rdpod returns forw ard pow er out (dbm) dbm po=[ ]dbm rdpow returns forw ard pow er out (w) w a tts po=[ ]w rdprd returns reverse pow er out (dbm) dbm pr=[ ]dbm rdprw returns reverse pow er out (w) w a tts pr=[ ]w rdpohid returns over forw ard pow er w a rn ing setpoint (dbm) dbm pohi=[ ]dbm spohid sets over forw ard pow er w a rning setpoint (dbm) dbm rdpolod returns under forw ard pow er w a rning setpoint (dbm) dbm polo=[ ]dbm spolod sets under forw ard pow er w a rning setpoint (dbm) dbm rdpohiw returns over forw ard pow er w a rning setpoint (w) w a tts pohi=[ ]w spohiw sets over forw ard pow er w a rning setpoint (w) w a tts rdpolow returns under forw ard pow er w a rn ing setpoint (w) w a tts polo=[ ]w spolow sets under forw ard pow er w a rning setpoint (w) w a tts rdprhid returns over reverse pow er w a rning setpoint (db) dbm prhi=[ ]dbm spprhid sets over reverse pow er w a rning setpoint (dbm) dbm rdprhiw returns over reverse pow er w a rn ing setpoint (w) w a tts prhi=[ ]w sprhiw sets over reverse pow er w a rning setpoint (w) w a tts sy stem:on emulates pressing the sy stem on button from sy stem off (exit sleep mode) sy stem:off emulates pressing the pow e r save button. (enter sleep mode) rdhtrautooff returns heater auto off delay hours shtrautooff sets heater auto off delay (see table 9) *idn?; returns the product model number [ ] *sta?; returns status string (see table 7) [ ] *stb?; returns status string (see table 8) [ ] rev b 19 http:// m odel 20T4G18 table 4. catalog of status codes (the rdstat com m a nd causes the twta to re turn a string in the form status=[ code ] , where [ code ] i s an ascii num ber whose m eaning is given below) sta t us code me a n ing 0 no command w a s given. 1 last command w a s successful. 2 last command is in process. 3 last command failed to complete. time-out. 10 last command failed. invalid command. 11 last command failed. data w a s unparseable. 20 last set command failed. data w a s bey ond high limit. 21 last set command failed. data w a s bey ond low limit. 22 last set command failed. data w a s out of range 23 last set command failed. data w a s w r ong polarity 50 last command failed. local sy st em does not have remote enabled. 51 remote sy stem is not ready to accept commands. 60 command is not allow ed in current sy stem state. 901 assert error: invalid table argument* 902 assert error: invalid calibration* * please call a service representat ive if y ou observe this error. table 5 catalog of fault codes returned by rdflt command (the rdflt com m a nd causes the twta to return a string in the form flt=[ code ] , where [ code ] is an acsii num ber whose m eaning is given below). fa ult code me a n ing 0 n o f a u l t 7 s y s t e m f a u l t 8 h i g h l i n e 9 l o w l i n e 1 0 c a t h o d e o v e r v o l t a g e 1 1 b o d y o v e r c u r r e n t 1 2 c a t h o d e u n d e r v o l t a g e 13 heater undervoltage (?fil not ready ?) 14 heater overcurrent (?fil o/current?) 1 5 c o l l e c t o r u n d e r v o l t a g e 1 6 i n v e r t e r f a u l t 17 internal interlock open 1 8 t u b e a r c 19 twt (hardw are) overtemperature 20 cabinet (hardw are) overtemperature 23 over reverse pow er 49 twt (softw are) overtemperature 50 cabinet (softw are) overtemperature 20 rev b http:// m odel 20T4G18 table 6. catalog of system state codes (the rdlogic com m a nd causes the tw ta to send a string containing an operational state code consisting of 4 ascii characters representing hex digits. the response is in the form "sys: [w] [ x ] [y ] [ z] [e ol ] " where the hex values of [w] , [x] , [y] and [z] are form ed as shown below) z bit me a n ing 0 (lsb) high voltage on 1 t r a n s m i t o n 2 r e m o t e m o d e 3 (msb) fault y bit me a n ing 4 (lsb) heater time delay expired 5 under forw ard pow er w a rning 6 f o l d b a c k a c t i v e 7 (msb) inhibit mode x b i t mean in g 8 (lsb) external inhibit 9 i n t e r l o c k o p e n 1 0 ( n o t u s e d ) 11 (msb) (not used) w bit me a n ing 12 (lsb) (not used) 13 sleep mode active 1 4 ( n o t u s e d ) 15 (msb) (not used) table 7. *sta?; response codes (the com m a nd *sta? ; causes the twta to send a st ring indicative of the current sy stem state) *sta ?; re s pons e me a n ing sleep sleep mode active (heater off) warm-up sy stem is in heater time delay . standby sy stem is ready to allow high voltage on operate high voltage is on and beam is on fault high voltage is off and sy stem requires reset rev b 21 http:// m odel 20T4G18 table 8. *stb?; response codes (the com m a nd *stb? ; causes the twta to send a string c ontaining an operational state code consisting of 2 ascii characters representing hex digits. the response is in the form ?status: [x ] [ y ] [e o l ] ? where the hex values of [x ] and [y ] are form ed as shown below) x b i t mean in g 1 mode sw itch; alw a y s 1 (reset) 2 blank sw itch; alw a y s 1 (off) 3 blank status; alw a y s 0 (off) 4 not used; alw a y s 0 y bit me a n ing 1 pow e r status; alw a y s 1(pow er on) 2 standby status; 0 if not in standby , 1 if in standby 3 operate status; 0 if not in operate, 1 if in operate 4 fault status; 0 if no fault, 1 if fault exists table 9. catalog of heater auto off tim e d e l a y c o d e s a r gume n t m e a n i n g 0 0.5 hour heater auto off time delay 1 1.0 hour heater auto off time delay 2 1.5 hour heater auto off time delay 3 2.0 hour heater auto off time delay 4 2.5 hour heater auto off time delay 5 3.0 hour heater auto off time delay com m a nd sy ntax is in this form : m odel 20T4G18 a sm all sam ple program that can send com m a nds and receive the strings returned by the twta is included in section 5.6. it is written in hewlett-packard' s ?rocky mountain? basic. the program assum es that the ieee-488 bus is at address 7 and that the address of the twta is 01. rem o te operation is determ ined by the application (s oftware) program in the sy stem controller. this application program will aid the user in generating the com m a nd codes and display i ng/m onitoring the status codes. consult the application program users instructions for rem o te operation procedure. the application program should issue only one string at a tim e. after each functional com m a nd is issued the status should be checked to ensure that the com m a nd has been properly executed. the application program should allow sufficient tim e for the function to be com p leted before checking the status. the application program should facilitate checking the stat us just prior to issuing a com m a nd, since the status could have been changed by a fault condition of the am plifier or by operator activation of the am plifier. periodic checking of the status is also recom m e nded. 3.9 twta general considerations this section is intended to offer som e guidelines regard ing operation, storage and use of am plifier research twtas. storage: twtas, as with other electronic equipm ent, are best stored in a benign environm ent at reasonably constant tem p erature. service life is not im proved by periodic operation. availability: for critical m i ssions, and after long periods of storage, it is recom m e nded that twta operation be checked sufficiently in advance of the m i ssi on to perm it repair if required. though service life is not im proved by periodic operation, users experiencing am plifier trip due to body ove r current m a y benefit by periodically operating a unit with high voltage and grid on, but no rf driv e. such operation for about one hour on a weekly basis should effectively reduce nuisance tr ipping. since the cathode structure has finite life, extended periods of non-functional ope ration of twtas is not recom m e nded. an alternate approach, if periodic trip off has been observed, is to operate the unit without rf input for 1-2 hours before planned functional operation, resetting the unit after occasional trip off. cooling during operate mode: ar twtas have their air outlets a nd inlets on the rear panels. it is im portant to prevent the heated air, which is expelle d from the twta?s air outlets, from being recy cled into the air inlets. applications should have a clearance behi nd the twta of at least two feet for single bench top units and at least three feet for the higher power units, or the heated air should be ducted away . operation in standby mode: standby m ode for twtas readies the unit for operation. in this m ode the filam e nts are on but the high voltage is off. twtas s hould not be left in this standby m ode for extended periods. where practical, operational procedures s hould lim it the tim e on standby m ode to less than approxim a tely one hour. (see explanation of?., below) operate turn on: when selecting the operate m ode, when high voltage is first turned on, there m a y be som e internal twt arcing which can cause protective circ uits to deselect the operate m ode, thereby returning the unit to the standby m ode. there m a y be a report of body over-current fault. in either case, if there is no other contraindication, the operate m ode m a y be selected again. this procedure m a y b e repeated, if needed up to 25 tim es, until the operate m ode is actually set. if this condition persists, contact am plifier research service for additional assistance. (see explanation of?, below) noise power density (npd): twtas produce rf noise over their operating frequency range, as specified by the noise power density (npd). this noise is signifi cantly higher than the noise produced by ty pical solid rev b 23 http:// m odel 20T4G18 state am plifiers, and is inherent in present twtas. the noise m a y surprise users new to twtas when it accum u lates and results in a significant indication in a broadband m easurem e nt device ? such as a power m e ter or field probe. the error produced by this i ndication is not significant when operating near rated twta power levels, but m a y cause difficulty when try i ng to operate high power twtas at low output power levels. for exam ple, consider a hy pothetical ty pical npd of ?76 dbm / hz, from a 4 ghz bandwidth am plifier. a broadband detector m i ght see the npd as [-76 dbm / hz + 10 (log 4 x 10 9 ) bw factor = -76 + 96=] +20 dbm , or 0.1 watts. this power is insignificant for a u ser operating at 200 watts (+53 dbm ) , but m a y be very noticeable to a user try i ng to operate below 1 watt (+ 30 dbm ) . [ o ne watt is 0.5% of (23db below) rated power for a 200 watt am plifier.] a field probe user who obtains a 200 v/m field with 200 watts, m a y see a field as high as [ 53dbm ? 20dbm = 33db below 200 v/m=] 4.5 v/m due to this hy pothetical npd. for these applications the use of a lower power am plifier is highly recom m e nded, especially when considering safety issues. alternatively , additional pow er loss in the form of an added high power m i crowave attenuator, or preferably an increased space loss for radi ated fields, m a y be used to lower the noise received by the broadband m easurem e nt device. explanation of limiting the time in standby mode and of repeated operate selection. traveling wave tubes tend to get ?gassy ? if they are left in a ?standby ? m ode for extended periods of tim e. in this ?standby ? m ode, the heater (filam e nt) is on but ther e is no high voltage applied to the collector (or high voltage is applied to the collector but the grid is off). this is the norm a l state after a tube? s warm up tim e, just prior to entering the ?operate? m ode. in this state the cathode end of the twt is heating up but the electron ?beam ? is off. in other words, there is no cathode current. as the cathode heats up, gas trapped in the structure of the tube can be released, thus corrupting the vacuum of the tube. if the tube becom e too ?gassy ?, arcing m a y occur when the high voltage is fully applied in the ?operate? m ode. another possibl e failure m ode is a body over-current fault when the beam is turned on and the tube is ?gassy ?. occasional arcing is norm a l for a twt. the support co m ponents are designed to handle this, protecting both the twt and its support circuitry . however, if the t ube arcs two or three tim es in rapid succession, or worse y e t repeatedly , a fault will be sensed that will shut the high voltage off, thus rem oving the unit from ?operate? status. the rem e dy usually recom m e nded is to repeat the selection of the ?operate? m ode until the unit rem a ins in ?operate?. it as been found that m o st of the faults that can be cleared by this m e thod will be cleared within 25 attem p ts to enter the operate m ode. once the tube is operating norm a lly , gas will continue to evolve at a slow enough rate that the twta will not fault. this happens because the gas in the tube will interact with the beam and becom e ionized. as the electrons in the beam hit the gas m o lecules they ionize the gas, at wh ich point it is accelerated into the collector structure and ?buried? deep enough so that it ceases to be a problem . to preclude this gassing problem , and thus reduce the need for repeating the ?operate? selection, it is recom m e nded that the tim e in ?standby ? be lim ited ? to about one hour. extended periods in ?standby ? m a y result in an inability to clear the fault by this m e thod. in this case, service m easures m a y be needed to correct the unit. thus, users should reduce the likelihood of occurrence of this problem by lim iting the am ount of tim e in the ?standby ? m ode. the service m easures involve pulsing of the tube beam current and gradually increasing the duty of the pulsing until the unit will operate continuously . note that a sim ilar condition can exist for tubes with grids when the twta is in the ?operate? m ode (high voltage is on) but gating (control) input is set so that the grid turns off the twt beam current. operational pr ocedures should also lim it the tim e in this m ode. 24 rev b http:// 4. maintenance the twta does not require routine scheduled m a intenance . the only m oving parts are the elem ents of switches, relay s and blowers. preventive m a intenance is recom m e nded in paragraph 4.3. the twta is basically a factory repairable unit . however , since lim ited logic schem atics and partial parts inform ation is supplied in this m a nual (section v) so m e user service organizations m a y choose to perform their own corrective m a intenance . warnings and cautions should be observed. 4.1 safety warning warning: service work must be performed only by technicians thoroughly familiar with the high voltages present in microwave tube amplifiers in general, and with this equipment in particular. never handle the twt leads or the high-voltage connectors unless it has been positively established that the high-voltage filter capacitors have been discharged to a known safe level. caution: a malfunctioning power supply can cause damage to the twt. if you are troubleshooting the twta, remove the twt and substitute suitable loads to prevent damage to the twt. 4.2 unauthorized repairs caution: unauthoriz ed repairs or m o dification of this product during the warranty period may void the warranty. in the event that the twta malfunctions while it is still under warranty, always contact an authoriz ed service representative. 4.3 preventive maintenance the rf characteristics and power supply voltages and currents of the twta should be logged on a regular basis. maintenance should be perform ed if significant deviations from the logged values appear. if the unit is under warranty , contact an authorized service repr esentative if im paired perform ance is suspected. if there is accum u lated dust on the air intake grill, clean it with dry com p ressed air. if significant dust has been noted on the air intake grill, it m a y be desirable to vacuum the dust and debris from inside the enclosure. rev b 25 http:// m odel 20T4G18 to open the enclosure: 1. rem ove the am plifier from the cabinet or rack as follows: note: due to the weight of the unit, the removal of the amplifier from the cabinet or rack is a two person operation. disconnect power, rf, and any other interface connector s. on the rear of the unit, rem ove any screws used to connect brackets to the am plifier. on the front of the unit, rem ove the four screws holding the front panel onto the cabinet. carefully slide th e am plifier out of the front of the cabinet. 2. rem ove the 12 screws that secure the lower cover and the 12 screws that secure the upper cover. rem ove the covers to gain access to the interior of the twta. vacuum dust and debris from inside the enclosure. clean dust from the twta and its fly i ng leads. rem ove any dirt from around the three high voltage conn ectors. while the cover is off, check for loose wires, com ponents or fasteners. reassem ble in the reverse order. 4.4 troubleshooting sy mp to m p o ssib l e cau s e twt or pow er supply overtemper ature air inlet filter dirty collector heat sink dirty inadequate clearance behind twta high air inlet temperature defective blow er or pow er supply no response w hen main pow er turned on panel open interlock sw itch open control module display does not come up; unit does not beep w hen pow ered up shorted or defective control module pow er supply control module failure control module does not boot eprom(s) missing. control module "datalink failure" or ?communication problem? error appears hpa interface failure. f i ber optic link failur e + 15 vdc supply failure heater pow er supply does not come up de fective low voltage pow er supply module defective heater pow er supply module no high voltage open external interlock key l ock sw itch on "inhibit" or "remo t e" defective high voltage pow er supply . voltages normal, but no rf output, helix current low no rf input defective remote control board defective ssa gain turned dow n after review of the sy m p tom s of the failure , the user m a y want to check for a loose connector or com ponent especially after rough handling of the unit . look externally for phy sical dam a ge and internally for unm ated or loose parts . 26 rev b http:// m odel 20T4G18 the service technician should becom e fam iliar with the in ternal m echanical construction to perm it correct re- assem bly . lim ited troubleshooting m a y be conducted, with caution, based on the failure sy m p tom and an understanding of the logic/schem atic diagram s . 4.5 non-repairable modules the high voltage diode/cap assem bly (a21455-100), th e high voltage filter assem bly (a21454), and the heater supply (a10010-000) are encapsulated m odules and are not repairable. contact an authorized service representative if replacem ent m odules are needed. rev b 27 http:// m odel 20T4G18 28 rev b http:// 5. technical document a tion note: the purpose of this technical documentation secti on is to provide a guide to the tw ta for technician- level servicing. it is intended for use by qua lified technical personnel who must troubleshoot and repair the tw ta in the field. such repairs are typi cally limited to replacement of modules or major components. for this reason, documentation pertai ning to the highest levels of the system and to system control logic is included. rev b 29 http:// m odel 20T4G18 5.1 top level build tree build tree for seria l number hpa 20w 4.2-18ghz (a r) a 28825-300 a28825-300 hpa 20w 4.2-18ghz (ar) 1a1 a23720-099 power supply ( short) for twt 5172 1a1a1 a23711-000 mo ther bo ard and heat sink 1a1a2 a23687-001 lo w vo ltag e po wer supply mo dule 1a1a3 a16485-000 hpa logic and control module 1a1a4 a23683-100 power factor module (500w) 1a1a4l4 a09006-000 pfc inductor for 100vac-255vac 1a1a5 a23710-000 power assembly for 100wku 1a1a5l1, l1a a09007-000 inductor for buck regulator 1a1a5t 1 (e42) a09402-000 xfmr,gate drive (hand wound) 1a1a5t 2 (e41) a09403-000 xfmr,gate drive (hand wound) 1a1a6 a21455-100 high voltage diode/cap assy for 100wku a 0 9 4 8 4 - 0 0 0 hv xfmr for twt 5181ku 1a1a7 a21457-001 hv filter module 1a1a8 a10017-100 pwm bo ard ( special ) 1a1a9 a10010-000 heater po wer supply mo dule 1a1a9t 1 a09409-000 xfmr,heater feedback 1a1a9t 2 a09408-000 xfmr,heater po wer 1a1a10 a24513-099 facto r y select parts 1a2 a28826-000 micro wave po wer assembly , ar 20cij 1a3 a25403-302 twta co ntro l assy 20 cij/50x 1a3a1 a25450-000 cpu board w/powerfail (20mhz) 1a3a2 a25425-001 hpa display bo ard 1a3a3 a22488-003 gpib interface board, 3u twt products 1a4 a25444-000 hpa interface bo ard (plastic fibers) 1a5 a24830-001 emerg e ncy by pass bo ard 1a9 a28827-000 cabinet assy ar 20cij, cpi twt 1 a 1 1 a 2 4 8 3 0 - 0 0 2 emerg e ncy by pass bo ard 1 a 1 2 a 2 5 4 9 8 - 0 0 0 wiring kit 20w c/i/j 30 rev b http:// m odel 20T4G18 5.2 schematics 10-16485-000 hpa logic and control (a16485-000) 10-25444-000 hpa interface (a22444-000) 10-24830 emergency by pass board (a24830-001) 10-24830-002 emergency by pass board (a24830-002) 10-28825-300 hpa 20t series (a28825-300) rev b 31 http:// m odel 20T4G18 32 rev b http:// m odel 20T4G18 5.3 wiring diagrams 20-23720-099 twt pow e r supply ar 20t series (a23720-099) rev b 33 http:// m odel 20T4G18 34 rev b http:// m odel 20T4G18 5.4 parts lists a16485-000 hpa logic and control assembly a23720-099 pow e r supply (short) for twt 5172 a24830-001 emergency by pass board a24830-002 emergency by pass board a25444-000 hpa interface board (plastic) a28825-300 hpa 20w 4.2-18ghz (ar) a28826-000 microw ave pow e r assembly rev b 35 http:// m odel 20T4G18 5.4.1 parts list, hpa logic and control module, a16485-000 ref. desig. etm p/n description qua n tity b16485-000 hpa logic and control board 1 c11 c16333-000 cap,33mf,25v,aerl,(nichicon uvx1e330m) 1 c2, c5, c15, c58 c31028-000 cap,1000pf,200vdc,10%,cer,1% failure,(kemet ckr05 series w/"v" o p tio n ) 4 c3, c9, c10, c13, c14, c17, c19, c21, c22, c27, c28, c30, c31, c33, c36, c46 c31032-000 cap,0.01mf,200vdc,10%,cer,1% failure,(kemet ckr06 series w/"v" o p tio n ) 16 c61 c31033-000 cap,0.022mf,100vdc,10%,cer,1% failure,(kemet ckr06b223k w/v option) 1 c24, c60 c31036-000 cap,0.1mf,100vdc,10%,cer,1% failure,(kemet ckr06 series w/"v" o p tio n ) 2 c1, c4, c6, c7, c16, c18, c25, c26, c32, c34, c37, c38, c39, c40, c41, c43, c44, c45, c48, c49 c31040-000 cap,1mf,50vdc,10%,cer,1% failure,(kemet ckr06 series w/"v" o p tio n ) 20 d16, d23, d31 d10965-000 zener,15v,(diodes inc 1n965b) 3 d1, d3, d4, d5, d7, d8, d9, d10, d11, d12, d13, d17, d18, d19, d21, d22, d25, d26, d28, d30, d35, d37, d14454-000 diode,axial,(motorola 1n4454) 24 d36 d14733-000 zener,5.1v,1w,10%,axial,(motorola 1n4733) 1 f00010-000 washer,#2,lo ck,sst 3 f10086-000 php,2-56 x 3/16sst 3 j2 j10370-000 conn,37 pin,male,d-sub,pcb right angle, (amp 747252-4) 1 j18075-000 male screw lock,for d submin conn,(amp 205817-1) 1 j4, j5 j18086-000 co nn,,sma,jack receptacle,rig ht ang l e,0- 18ghz,pc mount [johnson components 142- 0701-301] 2 j1 n25003-000 hy pertronics conn,29 pin male right angle,(cut ends) 1 q2 q22907-000 transistor,pnp,2n2907a,to-18 1 r1, r9, r19, r37, r44, r50 r00100-000 res,10 ohm,1/4w,5%,cc,(a/b rc07gf100j) 6 r4, r20, r27, r29 r01100-000 res,100 ohm,1/4w,5%,cc,(a/b rc07gf101j) 4 r5, r17, r18, r28, r34, r45, r49, r53, r54, r59, r71, r88 r02100-000 res,1k,1/4w,5%,cc,(a/b rc07gf102j) 12 r6 r02270-000 res,2.7k,1/4w,5%,cc,(a/b rc07gf272j) 1 r30, r31, r36 r02470-000 res,4.7k,1/4w,5%,cc,(a/b rc07gf472j) 3 r86, r87 r02510-000 res,5.1k,1/4w,5%,cc,(a/b rc07gf512j) 2 r75 r02560-000 res,5.6k,1/4w,5%,cc,(a/b rc07gf562j) 1 r38, r77, r90 r03100-000 res,10k,1/4w,5%,cc,(a/b rc07gf103j) 3 r32 r03470-000 res,47k,1/4w,5%,cc,(a/b rc07gf473j) 1 r35 r05820-000 res,8.2m,1/4w,5%,cc,(a/b rc07gf825j) 1 r13, r14 r10002-000 trimpot,5k,1/2w,10%,cermet,20t,side adj,(bourns 3296x-1-502) 2 r76 r21499-000 res,4.99k,1/2w,1%,mf,100ppm,(dale rn55d) 1 r10 r21523-000 res,5.23k,1/2w,1%,mf,100ppm,(dale rn55d) 1 r16 r21866-000 res,8.66k,1/2w,1%,mf,100ppm,(dale rn55d) 1 r52, r73 r21887-000 res,8.87k,1/2w,1%,mf,100ppm,(dale rn55d) 2 36 rev b http:// m odel 20T4G18 ref. desig. etm p/n description qua n tity r67 r21953-000 res,9.53k,1/2w,1%,mf,100ppm,(dale rn55d) 1 r47, r48 r22200-000 res,20k,1/2w,1%,mf,100ppm,(dale rn55d) 2 r79, r80 r22470-000 res,47k,1/2w,1%,mf,100ppm,(dale rn55d) 2 r42, r60, r61, r89 r23100-000 res,100k,1/2w,1%,mf,100ppm,(dale rn55d) 4 r33, r55 r23698-000 res,698k,1/2w,1%,mf,100ppm,(dale rn55d) 2 r41 r23750-000 res,750k,1/2w,1%,mf,100ppm,(dale rn55d) 1 r21 r23845-000 res,845k,1/2w,1%,mf,100ppm,(dale rn55d) 1 r66 r23953-000 res,953k,1/2w,1%,mf,100ppm,(dale rn55d) 1 r12, r15 r32020-000 trimpot,10k,1/2w,10%,cermet,20t,side adj,(beckman 67x) 2 u4, u5, u6 u02390-000 ic,quad comparator,(nat lm139j) 3 u7 u03240-000 ic,low power op amp,(nat lm324) 1 u9 u10070-000 reference,precision 10v [linear tech lt1031dch] 1 u8 u17805-000 ic,5v regulator,to-220,(nat lm340t-5.0) 1 u1, u2, u3 u20148-000 ic,hex inverter,schmidtt trigger,(74hc14) (ssd) 3 rp8 u30106-000 ic,10k,res netwo r k,6 pin,sip (dale msp06a-01- 103g) 1 rp1-2, rp5-7, rp9 u30410-000 ic,10k,2%,0.40a,10 pin,iso l ated resisto r s (dale msp10c-03-103g or bourns 4610h-102- 103) 6 rp4 u31020-000 ic,1k res network,sip,(beckman l061c102g) 1 w3- w 8 w12200-000 wire, 22 awg, blu, 600v, teflon, (belden 83006) 6 rev b 37 http:// m odel 20T4G18 5.4.2 parts list, power supply (short) for twt 5172, a23720-099 ref. desig. etm p/n description qua n tity a9 a10010-000 heater po wer supply mo dule 1 a8 a10017-100 pwm bo ard ( special ) 1 a3 a16485-000 hpa logic and control module 1 a6 a21455-100 high voltage diode/cap assy for 100wku 1 a7 a21457-001 hv filter module 1 a4 a23683-100 power factor module (500w) 1 a2 a23687-001 lo w vo ltag e po wer supply mo dule 1 a5 a23710-000 power assembly for 100wku 1 a1 a23711-000 mo ther bo ard and heat sink 1 a10 a24513-099 facto r y select parts 1 38 rev b http:// m odel 20T4G18 5.4.3 parts list, emergency by pass board, a24830-001 ref. desig. etm p/n description qua n tity b24830-000 emergency by pass board 1 c 3 - c 5 c 0 4 1 0 5 - 0 0 0 c a p , 0 . 1 m f , 1 0 0 v , 2 0 % , m o n , ( k e m e t c331c104m1r5ca) 3 c 6 c 3 0 0 1 0 - 0 0 0 c a p , 1 0 m f , 3 5 v , t a n t , r a d i a l , ( n e m c o t b 1 0 - 3 5 k 1 ) 1 c 2 c 3 1 0 2 8 - 0 0 0 c a p , 1 0 0 0 p f , 2 0 0 v d c , 1 0 % , c e r , 1 % f a i l u r e , ( k e m e t ckr05 series w/"v" o p tio n ) 1 c 1 c 3 1 0 3 2 - 0 0 0 c a p , 0 . 0 1 m f , 2 0 0 v d c , 1 0 % , c e r , 1 % f a i l u r e , ( k e m e t ckr06 series w/"v" o p tio n ) 1 c 7 c 3 1 0 4 0 - 0 0 0 c a p , 1 m f , 5 0 v d c , 1 0 % , c e r , 1 % f a i l u r e , ( k e m e t ckr06 series w/"v" o p tio n ) 1 d1, d2 d14454-000 diode,axial,(motorola 1n4454) 2 d3, d4 d14733-000 zener,5.1v,1w, 10%,axial,(motorola 1n4733) 2 i2, i3 i10066-000 led,red,high efficiency ,high brightness 2 i1, i4 i10096-000 led,green,diffused,t1-3/4 (xc55g) 2 tp2 j16212-000 test jack,red,vertical,(ef johnson 105-0852- 001) 1 tp3 j16213-000 test jack,orange,vertical,(ef johnson 105- 0856-001) 1 j 2 j 1 8 0 8 6 - 0 0 0 conn,,sma,jack re ceptacle,right angle,0- 18ghz,pc mount [johnson components 142- 0701-301] 1 j1 j18180-000 conn,d-sub,15 pin,male,straight,pcb mount (positronic md15m3000) 1 q 1 - q 3 q 2 2 2 2 2 - 0 0 0 t r a n s i s t o r , n p n , 2 n 2 2 2 2 a , t o - 1 8 3 q4, q5 q22907-000 transistor,pnp,2n2907a,to-18 2 r18, r23 r01100-000 res,100 ohm,1/4w,5%,cc,(a/b rc07gf101j) 2 r21 r01150-000 res,150 ohm,1/4w,5%,cc,(a/b rc07gf151j) 1 r 1 9 r 0 2 1 0 0 - 0 0 0 r e s , 1 k , 1 / 4 w , 5 % , c c , ( a / b r c 0 7 g f 1 0 2 j ) 1 r3, r5, r7 r02220-000 res,2.2k,1/4w,5%,cc,(a/b rc07gf222j) 3 r 2 2 r 0 2 3 3 0 - 0 0 0 r e s , 3 . 3 k , 1 / 4 w , 5 % , c c , ( a / b r c 0 7 g f 3 3 2 j ) 1 r16, r17 r02470-000 res,4.7k,1/4w,5%,cc,(a/b rc07gf472j) 2 r 2 4 r 0 2 5 1 0 - 0 0 0 r e s , 5 . 1 k , 1 / 4 w , 5 % , c c , ( a / b r c 0 7 g f 5 1 2 j ) 1 r4, r6, r8, r9, r13, r15 r03100-000 res,10k,1/4w,5%,cc,(a/b rc07gf103j) 6 r 1 r 1 2 1 0 7 - 0 0 0 t r i m p o t , 1 k , 1 / 2 w , 1 0 % , c e r m e t , 1 t , s i d e adj,(beckman 72xl) 1 r20 r20267-000 res,267 ohm,1/2w,1%,mf,100ppm,(dale rn55d) 1 r10, r11, r12 r23100-000 res,100k,1/2w,1%,mf,100ppm,(dale rn55d) 3 r 2 r 3 0 0 7 4 - 0 0 0 t r i m p o t , 1 k , 1 / 2 w , 1 0 % , c e r m e t , 1 0 0 p p m , 2 0 t , t o p adj,(beckman 67w) 1 s2, s3 s22004-000 sw itch,toggle,dpdt,pc mnt,(augat mta- 206n-pc) 2 s 1 s 2 2 0 1 0 - 0 0 0 sw i t c h , t o g g l e , 4 p d t , o n - n o n e - o n , 1 2 5 v @ 6a,(augat mta-406n-pc) 1 u2 u11458-000 ic,dual op amp,(nat lm1458cn) 1 u1 u17805-000 ic,5v regulator,to-220,(nat lm340t-5.0) 1 rev b 39 http:// m odel 20T4G18 5.4.4 parts list, emergency by pass board, a24830-002 ref. desig. etm p/n description qua n tity b24830-000 emergency by pass board 1 c 3 - c 5 c 0 4 1 0 5 - 0 0 0 c a p , 0 . 1 m f , 1 0 0 v , 2 0 % , m o n , ( k e m e t c331c104m1r5ca) 3 c 6 c 3 0 0 1 0 - 0 0 0 c a p , 1 0 m f , 3 5 v , t a n t , r a d i a l , ( n e m c o t b 1 0 - 3 5 k 1 ) 1 c1, c2 c31032-000 cap,0.01mf,200vdc,10%,cer,1% failure,(kemet ckr06 series w/"v" o p tio n ) 2 c 7 c 3 1 0 4 0 - 0 0 0 c a p , 1 m f , 5 0 v d c , 1 0 % , c e r , 1 % f a i l u r e , ( k e m e t ckr06 series w/"v" o p tio n ) 1 d1, d2 d14454-000 diode,axial,(motorola 1n4454) 2 d3, d4 d14733-000 zener,5.1v,1w, 10%,axial,(motorola 1n4733) 2 i 4 i 1 0 0 9 6 - 0 0 0 l e d , g r e e n , d i f f u s e d , t 1 - 3 / 4 ( x c 5 5 g ) 1 tp2 j16212-000 test jack,red,vertical,(ef johnson 105-0852- 001) 1 tp3 j16213-000 test jack,orange,vertical,(ef johnson 105- 0856-001) 1 j 2 j 1 8 0 8 6 - 0 0 0 conn,,sma,jack re ceptacle,right angle,0- 18ghz,pc mount [johnson components 142- 0701-301] 1 j 1 j 3 1 0 5 5 - 0 0 0 conn,d-sub,15 p i n , f e m a l e , s t r a i g h t , p c b mount,[amphenol 17d-a15s-u] 1 q4, q5 q22907-000 transistor,pnp,2n2907a,to-18 2 r18, r23 r01100-000 res,100 ohm,1/4w,5%,cc,(a/b rc07gf101j) 2 r21 r01514-000 res,510 ohm,1w,5%,cc,(a/b, rc20gf511j) 1 r 1 9 r 0 2 1 0 0 - 0 0 0 r e s , 1 k , 1 / 4 w , 5 % , c c , ( a / b r c 0 7 g f 1 0 2 j ) 1 r 2 2 r 0 2 3 3 0 - 0 0 0 r e s , 3 . 3 k , 1 / 4 w , 5 % , c c , ( a / b r c 0 7 g f 3 3 2 j ) 1 r16, r17 r02470-000 res,4.7k,1/4w,5%,cc,(a/b rc07gf472j) 2 r9, r13, r15 r03100-000 res,10k,1/4w,5%,cc,(a/b rc07gf103j) 3 r20 r20267-000 res,267 ohm,1/2w,1%,mf,100ppm,(dale rn55d) 1 r10, r11, r12 r23100-000 res,100k,1/2w,1%,mf,100ppm,(dale rn55d) 3 r 2 r 3 0 0 7 4 - 0 0 0 t r i m p o t , 1 k , 1 / 2 w , 1 0 % , c e r m e t , 1 0 0 p p m , 2 0 t , t o p adj,(beckman 67w) 1 u2 u11458-000 ic,dual op amp,(nat lm1458cn) 1 u1 u17808-000 ic,8v regulator,to-220,(nat lm340t-8.0 or lm7808) 1 40 rev b http:// m odel 20T4G18 5.4.5 parts list, hpa interface board (plastic), a25444-000 ref. desig. etm p/n description qua n tity b25444-000 hpa interface bo ard 1 c161 c03105-000 cap,0.01mf,100v,cer,10%,radial,(avx sr201c103kaa) 1 c171 c04223-000 cap,0.22mf,35v,tant,radial, [jamco 33507] 1 c20, c32, c100 c05153-000 cap,1.5mf,35v,tant,radial,(avax, tap155k035scs) 4 c129, c163 c05223-000 cap,2.2mf,35v,10%,so l id sealed tant,radial,(sprague 199d225x9035ba1) 2 c80, c81, c164 c06103-000 cap,10mf,25v,20%,so l id tant,radial,(avx tap106m025hsb) 3 c15 c06220-000 cap,22mf,16v,so l id tant,radial,(avx tap226k016scs) 1 c99 c16103-000 cap,10mf,35v,aerl,(nichicon uvr1v100mda) 1 c101 c17222-000 cap,220mf,16v,aerl,(nichicon, uvr1c221mea) 1 c47, c67 c17224-000 cap,220mf,50v,aerl,(ill cap 227rar050a) 2 c44, c168, c169 c30066-000 cap 47 mf, 35v, so lid tant. radial, (kemet t356m476k035as) 3 c165, c166, c6, c7, c9, c13, c16, c39, c31016-000 cap,100pf,200vdc,10%,cer,1% failure,(kemet ckr05 series w/"v" o p tio n ) 10 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 121, 125, 132, 167, 1, 2, 3, 4, 5, 10, 11, 22, 23, 24, 25, 26, 28, 30, 33, 35, 40, 41, 42, 48, 49, 50, 51, 53, 62, 63, 64, 65, 70, 71, 73, 77, 79, 83, 85, 87, 88, 89, 91, 94, 96, 97, 98, 102, c31036-000 cap,0.1mf,100vdc,10%,cer,1% failure,(kemet ckr06 series w/"v" o p tio n ) 61 c12, c14, c21, c27, c29, c31, c34, c36, c38, c17, c18, c19, c37, c54, c55, c56, c57, c58, c59, c60, c61, c118, c119, c120, c122, c123, c124, c133, c46, c52, c66, c68, c72, c75, c82, c84, c86, c90, c92, c93, c95, c104, c106, c31040-000 cap,1mf,50vdc,10%,cer,1% failure,(kemet ckr06 series w/"v" o p tio n ) 44 d8, d10-d16, d18-d19 d14007-000 diode,1000v,1a,axial,(motorola 1n4007) 10 d1-d7 d14454-000 diode,axial,(motorola 1n4454) 7 d9, d17 d14733-000 zener,5.1v,1w,10%,axial,(motorola 1n4733) 2 i1 i10074-000 led,g r een,alg aas,no n-diffused,(hewlett packard hlmp-1540) 1 j5 j10021-000 header,2 pin,male,right angle,series 7478 (molex 22-05-3021) 1 j1 j10371-000 d-sub,37 pin male,pcb mount,straight (positronics md37m3s000) 1 xu17 j14161-000 skt,dip,16 pin,mach sleeves,(augat 516- ag11d) 1 xu26 j14202-000 skt,dip,20 pin,mach sleeves,(samtec ica-320- sg t) 1 xu15 j14281-000 skt,dip,28 pin,mach sleeves,(samtec ica-628- sg t) 1 tp0 j16210-000 test jack,black,vertical,(ef johnson 105- 0853-001) 1 tp1 j16211-000 test jack,brown,vertical,(ef johnson 105- 0858-001) 1 tp2 j16212-000 test jack,red,vertical,(ef johnson 105- 0852-001) 1 tp3 j16213-000 test jack,orange,vertical,(ef johnson 105- 0856-001) 1 rev b 41 http:// m odel 20T4G18 ref. desig. etm p/n description qua n tity tp4 j16214-000 test jack,y ellow,vertical,(ef johnson 105- 0857-001) 1 tp5 j16215-000 test jack,green,vertical,(ef johnson 105- 0854-001) 1 tp6 j16216-000 test jack,blue,vertical,(ef johnson 105- 0860-001) 1 j4 j18167-000 d-sub,37 pin,female,pcb mount,right angle (amp 745784-4) 1 j3 j18180-000 co nn,d-sub,15 pin,male,straig h t,pcb mo unt (positronic md15m3000) 1 j2 j31013-000 co nn,d-sub,25 pin,male,rig ht ang l e,pcb mount,[amp 747238-4] 1 xj1-xj4 j31014-000 spring latch kit,d-sub,(amphenol 17-529) 4 k1-k6 k02009-000 relay , dpdt,5vdc,125v @ 0.5a / 30vdc @ 1a co ntacts,pcb terminals,sealed (o mro n g6h-2-dc5) 6 l1-l4 l00200-000 wide band choke,(vk200 10/3b ferroxcube) 4 q1, q2, q3, q4, q5, q6, q7, q8 q22222-000 transistor,npn,2n2222a,to-18 8 r2 r01220-000 res,220 ohm,1/4w,5%,cc,(a/b rc07gf221j) 1 r41 r01680-000 res,680 ohm,1/4w,5%,cc,(a/b rc07gf681j) 1 r1 r04200-000 res,200k,1/4w,5%,cc,(a/b rc07gf204j) 1 r4, r7 r05820-000 res,8.2m,1/4w,5%,cc,(a/b rc07gf825j) 2 r6, r8, r58 r20100-000 res,100 ohm,1/2w,1%,mf,100ppm,(dale rn55d) 3 r57 r20200-000 res,200 ohm,1/2w,1%,mf,100ppm,(dale rn55d) 1 r11 r20243-000 res,243 ohm,1/2w,1%,mf,100ppm,(dale rn55d) 1 r16 r20845-000 1 r59 r22332-000 res,33.2k,1/2w,1%,mf,100ppm,(dale rn55d) 1 r3, r5 r30071-000 trimpot,10k,1/2w,10%,cermet,100ppm,20t,top adj,(beckman 67w) 2 r9, r12, r15, r22, r35, r36, r40, r44, r30103-000 res,10k,1/8w,1%,mf,axial,100ppm,(dale cmf-50 / rn50c1002f) 9 r17, r19, r20, r21, r23, r25, r28, r31, r42, r43, r46, r18 r30140-000 res,1k,1/8w,1%,mf,50ppm,(dale rn50c) 12 r13, r14, r24, r26, r27, r29, r32, r37, r38, r39, r47 r31164-000 res,100k,1/20w,1%,film,axial,100ppm,mil,(dale rn50c1003f) 11 u7, u8 u00027-000 ic,ultra low noise precision op amp,(analo g devices o p 27g p) 2 u26 u00029-000 converter,no oil,16bit,a to d,serial out,[burr-brown ads7809pb,pb],[analog devices ad977cn] 1 u17 u00524-000 ic,instrumentatio n amp,(analo g devices ad524a) (ssd) 1 u15 u00725-000 ic,dual 16 bit digital to analog converter,(burr-brown dac-725) (ssd) 1 u1 u03171-000 ic,adjustable vo ltag e reg u lato r,15w,1.5a, to-220,(nat lm317t) 1 u9, u10, u18 u04090-000 ic,4ch analog multiplexer,(datel mxd-409) 3 dp2, dp4, dp5, dp8, dp9 u08010-000 ic,8 common cathode clampimg diodes,9 pin sip,(rohm dan801) 5 dp1, dp3, dp6, dp7, dp10 u08011-000 ic,8 co mmo n ano d e clamping dio d es,9pin sip,(rohm dap801) 5 u27 u11165-000 ic,6.5536mhz clock oscillator,1/2 size,(ecliptek ec1100hs-6.5536mhz) (ssd) 1 u40 u11528-000 ic,versalink transmitter,ho rizo ntal, (200um fiber) (hewlett packard hfbr-1528) 1 u54 u12521-000 ic,fiber optic receiver,horizontal,(hp hfbr-2521) (ssd) 1 u36 u17545-000 driver,oil,ds75451n,dual and,[national semiconductor ds75451n] 1 res,845 ohm,1/2w,1%,mf,100ppm,(dale rn55d) 42 rev b http:// m odel 20T4G18 ref. desig. etm p/n description qua n tity u6, u19, u34, u39, u60 u20148-000 ic,hex inverter,schmidtt trigger,(74hc14) (ssd) 5 u42 u20730-000 ic,dual j-k flip flop w/reset,(7473) (ssd) 1 u51 u21328-000 ic,quad 2 input nand,schmidtt trigger,(74hc132) (ssd) 1 u52 u21388-000 ic,3 to 8 decoder/demultiplexer,inverting,(74hc138) (ssd) 1 u32 u21536-000 ic,dual 4 input digtal multiplexer,(74f153) (ssd) 1 u35 u22598-000 ic,8 bit addressable latch w/reset,(74hc259) (ssd) 1 u47 u23909-000 ic,dual 4 bit binary /biquinary counter (74hct390) (ssd) 1 u41, u48 u24018-000 ic,johnson decade counter w/10 decoded outputs,(74hc4017) (ssd) 2 u45 u24138-000 ic,8 bit binary down counter,(74hc40103) (ssd) 1 u43 u26889-000 ic,8 bit magnitude comparator,(74hct688) (ssd) 1 u22, u24, u57 u28008-000 ic,quad 2 input and,(74hc08) (ssd) 3 u4, u49, u58 u28032-000 ic,quad 2 input or,(74hc32) (ssd) 3 u44, u46 u28040-000 ic,12 bit decade counter,(74hct4040) (ssd) 2 u5, u13, u14, u23, u25, u33, u50 u28074-000 ic,dual d flip flo p w/reset,(74hc74) (ssd) 7 u2 u28123-000 ic,dual retriggerable 1-shot,(74hc123) (ssd) 1 u31, u53 u28164-000 ic,8 bit serial in parallel o u t shift register,(74hc164) (ssd) 2 u3, u12, u28, u37, u38 u28165-000 ic,8 bit parallel in serial o u t shift register,(74hc165) (ssd) 5 rp6 u32001-000 ic,1k feed-thro ug h res netwo r k,16 pin dip,(a/b 316b102) 1 rp1-rp5 u32103-000 ic,10k feed-through res network,16 pin dip,(a/b 316b103) 5 u56 u40008-000 regulator,oil,5v,100ma,to-92,[motorola mc78l05abp] 1 u55 u40012-000 flip-flop,octal d-ty pe latch w i th reset,[national mm74hc273n] 1 rev b 43 http:// m odel 20T4G18 5.4.6 parts list, hpa 20w 4.2-18ghz (ar), a28825-300 ref. desig. etm p/n description qua n tity a1 a23720-099 power supply ( short) for twt 5172 1 a5 a24830-001 emergency by pass board 1 a11 a24830-002 emergency by pass board 1 a3 a25403-302 twta control assy 20 cij/50x 1 a4 a25444-000 hpa interface board (plastic fibers) 1 a12 a25498-000 wiring kit 20w c/i/j 1 a2 a28826-000 microwave power assembly , ar 20cij 1 a9 a28827-000 cabinet assy ar 20cij, cpi twt 1 44 rev b http:// m odel 20T4G18 5.4.7 parts list, microwave power assembly , ar, a28826-000 ref. desig. etm p/n description qua n tity w3 e00888-007 cable,rf flex, 7,sma,male to male,20 ghz,50 ohm,blue fep teflon (dicar ez402-2121-07) 1 w6 e00888-009 cable,rf flex, 9,sma,male to male,20 ghz,50 ohm,0.141 cable,insulated jacket,[src 150- 150-150090] 1 w5 e00888-012 cable,rf flex,12,sma,male to male,20 ghz,50 ohm,0.141 cable,insulated jacket,[src 150- 150-150120] 1 w2 e00888-015 cable,rf flex,15,sma,male to male,20 ghz,50 ohm,0.141 cable, insulated jacket, [src 150- 150-150150] 1 w1 e00888-020 cable,rf flex,20,sma,male to male,20 ghz,50 ohm,0.141 cable, insulated jacket,[src 150- 150-150200] 1 a1 e01122-000 sspa, 4-18 ghz, +18dbm, 20db gain, with 35db vga, [cpi cma40180a(xx)] 1 a2 e08137-000 twt, 4-18 ghz, 25 watts,[cpi vtm-6196r5] 1 r1 e20012-000 attenuator 6db sma 2w,sub- miniature,[inmet, 18a-6] 1 r 2 e 2 0 0 6 4 - 0 0 0 a t t e n u a t o r , 3 d b , 2 w , d c - 1 8 g h z , m i n i t u r e , (midisco, mdc1065r-3] 1 a 4 e 2 0 1 2 9 - 0 0 0 c o u p l e r , 1 0 d b , 4 - 1 8 g h z , s m a , ( m a c technologies c4258-10) 1 e20130-000 adapter,sma male to sma female,right angle (cdi 5490ccsf / pasternack pe9262) 4 a5 e20279-000 equalizer,4-18 ghz,0-20 db @ 11 ghz,sma,(inmet eq1734) 1 d1, d2 e20284-000 zero-bias schottky detector,10mhz- 18.5ghz,positive out put polarity ,(rlc, m- 3747) 2 w4 e20476-000 rf cable, 18" lo ng, 0.290 dia, tnc-sp to sma- rap [storm 90-1343-018] 1 a 3 e 2 4 8 1 4 - 0 0 0 dual coupler,4.2-18ghz,ptnc,-35db/- 35db,(mac technology ca1158-35b) 1 j1, j2 j17264-000 adapter,ty pe n female to sma female,panel mount,(astrolab 29047) 2 j18160-000 conn,1 pin,female,20kv,10a,0.180 dia. lead,[connectronics 11039-02] 4 rev b 45 http:// m odel 20T4G18 5.5 recommended spare parts a16491-000 aux iliary pow er supply module (low voltage pow er supply ) . a21455-100 high voltage diode/cap assembly a21454-000 high voltage filter assembly a10010-000 heater pow er supply module y 10057-000 spinnaker dc blow er (comair rotron model spd24b1, part no. 032183) 46 rev b http:// m odel 20T4G18 5.6 sample program for ieee-488 communication 1000 ! *********************************************** 1010 ! * ieee-488 communications software * 1030 ! * 7/24/92 aaron d. mcclure * 1040 ! *********************************************** 1041 dim f$[80] 1042 dim a$[80] 1050 clear screen 1060 input "input command to send to power supply. exit to quit.",a$ 1070 if a$="exit" then 1130 1080 output 701;a$ 1090 if a$[1,2]<>"rd" then goto 1060 1095 if a$[1,1]="*" then goto 1100 1100 enter 701;f$ 1110 print "output from command ",a$," is ",f$ 1120 goto 1060 1130 clear screen 1140 end rev b 47 http:// m odel 20T4G18 48 rev b http:// warranties: limitation of liability seller warrants (i) that seller has title to the goods sold and (ii) that am plifiers, antennas, pre-com pliance test system s, transient generators, power meters, directional couplers and tripods will be free from defects in m a terial and workm a nship for a period of three (3) years from date of shipm e nt shown on am plifier research invoice. field monitoring equipm ent, teseo fiberoptic system s and traveling wave tubes in the 200t 1g3a, 200t2g8a and 200t8g18a will be free from defects in m a terial and workm a nship for a period of two (2) years from date of shipm e nt. vacuum tubes, traveling-wave tubes in m odels not previously listed and power heads will be free from defects in m a terial and workm a nship for a period of one (1) year. contact am plifier research for warranty inform ation regarding item s not listed. seller?s sole responsibility in fulfilli ng these warranties shall be to repair or replace any goods which do not conform to the foregoing warranties or, at seller?s option, to give buyer credit for defective goods. the warranty is valid only when used in the country specified at tim e of order. warranty service m u st be obtained from the repair facility designated at that tim e. if warranty service is not available in the country where the equipm ent is to be used, it m u st be returned to am plifier research. warranty service will be provided only for de fective goods which are returned within the warranty period, freight costs prepaid to am plifier research or its designated repair facility. there are no other warranties, express or im plied, including any warranty of m e rchantability or fitness. seller shall not be responsible for any incidental or consequential damages arising from any breach of warranty. no person other than an officer of am plif ier research corporation, has any authority to bind seller to any affirm ation, repres entation or warranty except as specifically included in the preceding term s and conditions. rev0701 http:// http:// |
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