HIGH POWER TRAVELING WAVE TUBE
FOR GROUND TERMINALS
14 GHz, 350 W/400 W CW, CONDUCTION COOLING, HIGH POWER GAIN
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.
™ 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
™ 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.
For safe use of microwave tubes, refer to NEC document “Safety instructions to all personnel
handling electron tubes” (ET0048EJ∗V∗UM00)
The information in this document is subject to change without notice.
Document No. ET0221EJ5V0DS00 (5th edition)
Date Published August 1999 M
Printed in Japan