DATA SHEET

Document No. ET0397EJ1V0DS00

Date Published August 1998 M

Printed in Japan

20 GHz, 250 W CW, PPM FOCUSING, HIGH POWER GAIN

HIGH POWER TRAVELING WAVE TUBE

FOR COMMUNICATIONS

LD7261

The information in this document is subject to change without notice.

©

1998

For safe use of microwave tubes, refer to NEC document “Safety instructions to all personnel

handling electron tubes” (ET0048EJ

∗V∗UM00)

GENERAL DESCRIPTION

The NEC LD7261 is a PPM-focused traveling wave tube designed for use as final amplifier in the earth-to-

satellite communications transmitter.

This is capable of delivering an output power of 250 W over the range of 18.0 to 21.7 GHz and provides a

power gain of more than 40 dB at 250 W.

Furthermore, it is rugged and reliable design offers long-life service.

FEATURES

™ High Power Gain

The power gain is typically 40 dB at 250 W level.

™ Simple Cooling System

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

™ PPM Focusing

The tube is PPM (Periodic Permanent Magnet) -focused, eliminating entirely the focusing power supplies

and interlock circuits.

™ Rugged Construction

The tube is designed to be rugged, therefore it is suitable for transportable systems.

™ Long Life and High Stability

The tube employs an advanced impregnated cathode with a low operating temperature for long life.

™ Microdischarge Free

The tube is carefully designed to be free from microdischarge in the electron gun for long term operation,

therefore it is suitable for digital communication service.