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DATA S H E E T
HIGH POWER TRAVELING WAVE TUBE FOR COMMUNICATIONS
LD7267 SERIES
30 GHz, 100 W CW, CONDUCTION COOLING, HIGH POWER GAIN
GENERAL DESCRIPTION
The NEC LD7267 series of PPM-focused traveling wave tubes are designed for use as final amplifiers in the earth-to-satellite communications transmitter, LMDS (Local Multipoint Distribution Service) and other advanced communication systems. Three models of the LD7267 series are capable of delivering an output power of 100 W over the range of 26.5 GHz to 31.1 GHz and provide a high power gain of 50 dB at 100 W output power. These are equipped with dualstage depressed collector for enhancing overall efficiency and a single collector. Furthermore, they are of rugged and reliable design offering long-life service.
FEATURES
TM High Power Gain The power gain is typically 50 dB at 100 W level. TM Simple Cooling System The tubes are conduction-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. ET0398EJ1V0DS00 Date Published August 1998 M Printed in Japan
(c)
1998
LD7267 SERIES
GENERAL CHARACTERISTICS
ELECTRICAL Frequency ...................................................... 26.5 to 28.6 GHz 27.5 to 30.0 GHz 30.0 to 31.3 GHz Output Power ................................................ 100 W Heater Voltage ................................................ 6.3 V Heater Current ................................................ 1.05 A Type of Cathode ............................................. Indirectly heated, Impregnated Cathode Warm-up Time ................................. 300 s MECHANICAL Dimensions ................................................... See Outline Weight ......................................................... 3.5 kg approx. Focusing ...................................................... Periodic Permanent Magnet Mounting Position .......................................... Any Electrical Connections .................................... Flying Leads RF Connections Input ......................................................... Mates with UG-599/U Flange Output ...................................................... Mates with UG-599/U Flange Cooling ......................................................... Conduction
ABSOLUTE RATINGS (Note 1, 2 and 3 )
ELECTRICAL Heater Voltage ............................................. Heater Surge Current ................................. Heater Current ............................................. Heater Warm-up Time ................................. Helix Voltage ............................................. Helix Current ............................................. 5Isolated Anode Type Anode Voltage ............................................. Anode Current ............................................. 5Single Collector Type Collector Voltage .......................................... Collector Current .......................................... 5Dual-stage Collector Type Collector Voltage-1 ....................................... Collector Current-1 ....................................... Collector Voltage-2 ....................................... Collector Current-2 ....................................... Cathode Current .......................................... RF Drive Power .......................................... Load VSWR ................................................ ENVIRONMENTAL Heat Sink Temperature ................................. Ambient Temperature Storage ...................................................... Operation ................................................... Min. -15 -55 -30 Max. +110 +100 +75 Unit C C C Min. 6.0 - - 300 10.5 - 0 0 4.0 - 4.0 - 1.8 - - - - Max. 6.6 1.6 1.5 - 11.5 3.0 10.0 1.0 6.0 120 6.0 80 2.5 120 120 3.0 1.25 : 1 Unit V A A s kV mA kV mA kV mA kV mA kV mA mA mW -
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LD7267 SERIES
TYPICAL OPERATION (Note 2, 3, 4 and 5)
Unit Frequency ................................................... Output Power ............................................. Heater Voltage ( Note 4 ) .............................. Heater Current ............................................. Helix Voltage ............................................. Helix Current ............................................. 5Isolated Anode Type Anode Voltage ............................................. Anode Current ............................................. 5Single Collector Type Collector Voltage .......................................... Collector Current .......................................... 5Dual-stage Collector Type Collector Voltage-1 ....................................... Collector Current-1 ....................................... Collector Voltage-2 ....................................... Collector Current-2 ....................................... Cathode Current .......................................... Power Gain Gain Variation Gain Slope at 10 W ........................... at 100 W ........................... at 10 W ........................... at 10 W ........................... at 10 W ........................... at 100 W ........................... 3rd Order Intermodulation ........................... (two equal carriers, 10 W total) (two equal carriers, 20 W total) 4.4 40 2.2 50 91 57 51 0.15 0.005 2.5 5.0 -30 kV mA kV mA mA dB dB dB/60MHz dB/MHz deg./dB deg./dB dBc 4.4 90 kV mA 9.0 0.01 kV mA 30.0 100 6.3 1.05 11.0 0.5 GHz W V A kV mA
AM-PM Conversion
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 : 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.
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LD7267 SERIES
LD7267 SERIES OUTLINE (Unit in mm)
67 0.5 55 0.5 10 0.5 45 0.5 Flying Leads 69 1 70.5
RF Input UG-599/U (No.4-40 UNC-2B 4 Threaded Holes)
69.5 1
361 0.5
400 1
RF Output UG-599/U (No.4-40 UNC-2B 4 Threaded Holes)
10.9 0.5
169 2
8- 4.5 Thru
42 0.5
34 0.5 21 0.5
131 1
55 0.5
12 0.5
Lead Color Brown Yellow Blue Black Red White
Lead Connections Heater Heater-Cathode Anode (1) Helix Collector-1 Collector-2 (2)
1. For the type without an isolated anode, the blue lead line will not be provided. 2. For the single collector type, the white lead line will not be provided.
4
12 0.5
LD7267 SERIES
5
LD7267 SERIES
No part of this document may be copied or reproduced in any form or by any means without the prior written consent of NEC Corporation. NEC Corporation assumes no responsibility for any errors which may appear in this document. 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. While NEC Corporation has been making continuous effort to enhance the reliability of its electronic components, the possibility of defects cannot be eliminated entirely. To minimize risks of damage or injury to persons or property arising from a defect in an NEC electronic component, customers must incorporate sufficient safety measures in its design, such as redundancy, fire-containment, and anti-failure features. NEC devices are classified into the following three quality grades: "Standard", "Special", and "Specific". The Specific quality grade applies only to devices developed based on a customer designated "quality assurance program" for a specific application. The recommended applications of a device depend on its quality grade, as indicated below. Customers must check the quality grade of each device before using it in a particular application. Standard: Computers, office equipment, communications equipment, test and measurement equipment, audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment and industrial robots Special: Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster systems, anti-crime systems, safety equipment and medical equipment (not specifically designed for life support) Specific: Aircrafts, aerospace equipment, submersible repeaters, nuclear reactor control systems, life support systems or medical equipment for life support, etc. The quality grade of NEC devices is "Standard" unless otherwise specified in NEC's Data Sheets or Data Books. If customers intend to use NEC devices for applications other than those specified for Standard quality grade, they should contact an NEC sales representative in advance. Anti-radioactive design is not implemented in this product.
Printed on recycled paper

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