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| DATA S H E E T HIGH POWER TRAVELING WAVE TUBE FOR GROUND TERMINALS LD7217 SERIES 6 GHz, 600 W/700 W CW, PPM FOCUSING, HIGH POWER GAIN GENERAL DESCRIPTION NEC LD7217 series of PPM-focused traveling wave tubes are designed for use as final amplifiers in the earth-tosatellite communications transmitter. LD7217S and LD7217 are capable of delivering an output power of 600 W and 700 W over the range of 5.85 to 6.425 GHz and provide a high gain of 45 / 54 dB at 600 / 700 W level . In addition, LD7217W is capable of delivering an output power of 700 W with a gain of 54 dB over the range of 5.85 to 6.65 GHz. The LD7217 series provide a flat gain variation of 1.5dB (LD7217S) ,1.0dB (LD7217) and 1.8dB (LD7217W) at any power level. Furthermore, these are of rugged and reliable design offering long-life service. LD7217S is fully compatible with VTC6361B3, and LD7217 is also fully compatible with VTC6361B4. FEATURES TM High Power Gain The power gain is typically 45 dB at 600 W level and 54 dB at 700 W level. TM Simple Cooling System All the tubes are forced-air-cooled, so that the cooling systems are greatly simplified. TM PPM Focusing The tubes are PPM (Periodic Permanent Magnet) -focused, eliminating entirely the focusing power supplies and interlock circuits. TM Rugged Construction The tubes are designed to be rugged, therefore they are suitable for transportable systems. TM Long Life and High Stability The tubes employ an advanced impregnated cathode with a low operating temperature for long life. TM Microdischarge Free The tubes are carefully designed to be free from microdischarge in the electron gun for long term operation, therefore they are suitable for digital communication service. For safe use of microwave tubes, refer to NEC document "Safety instructions to all personnel handling electron tubes" (ET0048EJVUM00) The information in this document is subject to change without notice. Document No. ET0190EJ3V1DS00 (3rd edition) Date Published August 1998 M Printed in Japan (c) 1996 LD7217 SERIES GENERAL CHARACTERISTICS ELECTRICAL Frequency LD7217, LD7217S .................................... LD7217W ................................................ Output Power LD7217S ................................................ LD7217, LD7217W .................................... Heater Voltage ............................................. Heater Current ............................................. Type of Cathode .......................................... Cathode Warm-up Time .............................. MECHANICAL Dimensions ................................................ Weight ...................................................... Focusing ................................................... Mounting Position ....................................... Electrical Connections ................................. Thermal Switch Connection RF Connections Input ...................................................... Output ................................................... Cooling ...................................................... N-Female Mates with CPR-137F Flange Forced Air ........................ See Outline 7 kg approx. Periodic Permanent Magnet Any AMP LGH-1I Deutsch DM9601-3P 600 W 700 W 6.3 V 1.7 A Indirectly heated, Impregnated 180 s 5.85 to 6.425 GHz 5.85 to 6.65 GHz ABSOLUTE RATINGS (Note 1, 2 and 3) ELECTRICAL Min. Heater Voltage ................................................ 6.0 Heater Surge Current .................................... - Heater Current ................................................ 1.5 Heater Warm-up Time .................................... 180 Helix Voltage ................................................ 10.2 Helix Current ................................................ - Accelerating Anode Voltage Accelerating Anode Current ........................... 0 ........................... - Max. 6.6 5.0 2.5 - 11.9 25 Note 5 2.0 7.5 475 0.1 1.7:1 Unit V A A s kV mA kV mA kV mA W Collector Voltage ............................................. 5.7 Cathode Current ............................................. - Drive Power ................................................... - Load VSWR ................................................... - MECHANICAL Min. Cooling Air Flow ............................................. 204 Ambient Temperature Storage ...................................................... -30 Operation ................................................... -10 Max. - +70 +60 Unit kg/hr C C 2 LD7217 SERIES TYPICAL OPERATION (Note 2, 3 and 6) LD7217S Frequency ................................................... Output Power ............................................. Heater Voltage (Note 4) ................................. Heater Current ............................................. Helix Voltage ................................................ Helix Current ................................................ Anode Voltage ............................................. Anode Current ............................................. Collector Voltage .......................................... Cathode Current .......................................... Power Gain ................................................ Gain Variation ............................................. Gain Slope ................................................... AM-PM Conversion ....................................... 3rd Order Intermodulation (two equal carriers, 350 W total) ..................... Air Flow ...................................................... -19 204 -19 204 dBc kg/hr 600 6.3 1.7 11.0 6.0 11.0 0.3 6.0 425 48 (at 60 W) 45 (at 600 W) 1.5 0.01 (at 60 W) 1.5 (at 60 W) 3.5 (at 600 W) LD7217, LD7217W 700 6.3 1.7 11.2 3.0 11.2 0.1 6.2 430 57 (at 70 W) 54 (at 700 W) 1.0 (LD7217) 1.8 (LD7217 W) 0.015 (at 70 W) 1.5 (at 70 W) 3.5 (at 700 W) Unit GHz W V A kV mA kV mA kV mA dB dB dB/ 575 MHz dB/800 MHz dB/MHz deg./dB deg./dB 5.85 to 6.425 5.85 to 6.425, 5.85 to 6.65 Note 1 : Absolute rating should not be exceeded under continuous or transient conditions. A single absolute rating may be the limitation and simultaneous operation at more than one absolute rating may not be possible. Note 2 : The tube body is at ground potential in operation. Note 3 : All voltages are referred to the cathode potential except the heater voltage. Note 4 : The optimum operating parameters are shown on a test performance sheet for each tube. Note 5 : The accelerating anode voltage should be at cathode potential for the off condition, and at helix for the full cathode current condition. The accelerating voltage should not exceed the helix voltage by 250 volts. Note 6 : These characteristics and operating values may be changed as a result of additional information or product improvement. NEC should be consulted before using this information for equipment design. This data sheet should not be referred to a contractual specification. 3 LD7217 SERIES LD7217 SERIES OUTLINE (Unit in mm) Heater-Cathode No. 6-32 UNC-2B Threaded Holes 8 Plcs AMP LGH-1I Connector 16.52.5 Collector Heater Anode 11.9 190.5 Air Inlet (Side Optional) 203.2 0.5 122 Thermal Switch Connector Deutsch DM9601-3P 1 & 2-Thermal Switch 3-Ground. (Helix) Contacts N.C. 101.6 0.5 455.71 81.3 0.5 101.60.5 546.1 Max. 190.5 2472.5 2001 RF Output CPR-137F Flange (No. 10-32 UNF-2B Threaded Holes) 1752.5 101.60.5 129.54 19 1 117 0.5 127 1 6.40.5 107 2 No. 6-32 UNC-2B Threaded Holes 8 Plcs 165.1 1.5 Air Inlet Interface 98.5 1 87.4 0.5 50.8 0.5 18.3 0.5 Air Outlet 139 1.5 342.9 106.51.5 139.7 Max. 76.2 NEC Corporation does not assume any liability for infringement of patents, copyrights or other intellectual property rights of third parties by or arising from use of a device described herein or any other liability arising from use of such device. No license, either express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of NEC Corporation or others. 31.8 0.5 76.2 0.5 152.4 0.5 127 10 Captive Fixing Screws No. 8-32 UNC-2A RF Input Type N Female |
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