GENERAL DESCRIPTION

NEC LD7249 series of PPM-focused traveling wave tube are designed for use as final amplifiers in the earth-to-

satellite communications transmitter.

Two models of the LD7249 series are capable of delivering an output power of 350 W and 400 W over the range

of 13.75 to 14.5 GHz and provide a high power gain of more than 47 dB at the rated output power level.

Furthermore, this is of rugged and reliable design offering long-life service.

FEATURES

™ High Power Gain

The power gain is typically 54 dB at the rated output power level.

™ Simple Cooling System

The tube is conduction-cooled so that the cooling system is 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.

DATA SHEET

Document No. ET0221EJ5V0DS00 (5th edition)

Date Published August 1999 M

Printed in Japan

14 GHz, 350 W/400 W CW, CONDUCTION COOLING, HIGH POWER GAIN

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

©

1997

HIGH POWER TRAVELING WAVE TUBE

FOR GROUND TERMINALS

LD7249 SERIES

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

handling electron tubes” (ET0048EJ

∗V∗UM00)