DATA SHEET

Document No. ET0190EJ3V1DS00 (3rd edition)

Date Published August 1998 M

Printed in Japan

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

HIGH POWER GAIN

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

™ High Power Gain

The power gain is typically 45 dB at 600 W level and 54 dB at 700 W level.

™ Simple Cooling System

All the tubes are forced-air-cooled, so that the cooling systems are greatly simplified.

™ PPM Focusing

The tubes are PPM (Periodic Permanent Magnet) -focused, eliminating entirely the focusing power supplies and

interlock circuits.

™ Rugged Construction

The tubes are designed to be rugged, therefore they are suitable for transportable systems.

™ Long Life and High Stability

The tubes employ an advanced impregnated cathode with a low operating temperature for long life.

™ 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.