LD7217 NEC | Alldatasheet

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Document No. ET0190EJ3V1DS00 (3rd edition) Date Published August 1998 M Printed in Japan

6 GHz, 600 W/700 W CW, PPM FOCUSING,

The information in this document is subject to change without notice. © 1996 HIGH POWER TRAVELING WAVE TUBE FOR GROUND TERMINALS LD7217 SERIES For safe use of microwave tubes, refer to NEC document “Safety instructions to all personnel handling electron tubes” (ET0048EJ*V*UM00) GENERAL DESCRIPTION NEC LD7217 series of PPM-focused traveling wave tubes are designed for use as final amplifiers in the earth-to- satellite 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

ª High Power Gain The power gain is typically 45 dB at 600 W level and 54 dB at 700 W level. ª Simple Cooling System All the tubes are forced-air-cooled, so that the cooling systems are greatly simplified. ª PPM Focusing The tubes are PPM (Periodic Permanent Magnet) -focused, eliminating entirely the focusing power supplies and interlock circuits. ª Rugged Construction The tubes are designed to be rugged, therefore they are suitable for transportable systems. ª Long Life and High Stability The tubes employ an advanced impregnated cathode with a low operating temperature for long life. ª 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.

Thermal Switch Connection …………………… Deutsch DM9601-3P RF Connections ABSOLUTE RATINGS (Note 1, 2 and 3) ELECTRICAL Min. Max. Unit Accelerating Anode Voltage ……………………… 0 Note 5 kV MECHANICAL Min. Max. Unit Ambient Temperature

TYPICAL OPERATION (Note 2, 3 and 6) LD7217S LD7217, LD7217W Unit 45 (at 600 W) 54 (at 700 W) dB 1.8 (LD7217 W) dB/800 MHz AM-PM Conversion ………………………………… 1.5 (at 60 W) 1.5 (at 70 W) deg./dB 3.5 (at 600 W) 3.5 (at 700 W) deg./dB 3rd Order Intermodulation (two equal carriers, 350 W total) ………………… –19 –19 dBc 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.

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, copy- rights or other intellectual property rights of NEC Corporation or others. LD7217 SERIES OUTLINE (Unit in mm) 11.9 6.4– 0.5 127 – 1 117– 0.5 107– 2 98.5– 1 106.5– 1.5 139.7 Max. 87.4– 0.5 127 76.2– 0.5 165.1– 1.5 139– 1.5 76.2 122 81.3– 0.5 19– 0.5200– 1 546.1 Max. 203.2– 0.5 455.7– 11 9 – 0.5 129.5– 4 342.9 31.8– 0.5 Air Inlet Interface Air Outlet No. 6-32 UNC-2B Threaded Holes

8 Plcs

10 Captive Fixing Screws

No. 8-32 UNC-2A Thermal Switch Connector Deutsch DM9601-3P 1 & 2-Thermal Switch 3-Ground. (Helix) Contacts N.C. No. 6-32 UNC-2B Threaded Holes (No. 10-32 UNF-2B Threaded Holes) Air Inlet (Side Optional) Anode Heater Collector Heater-Cathode