GENERAL DESCRIPTION

NEC LD7237 is 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 400 W over the range of 17.3 to 18.1 GHz and provides a high power gain of 53 dB at 400 W output power.

Furthermore, this is of rugged and reliable design offering long-life service. LD7237 is fully compatible with TH3694B.

FEATURES

○ High Power Gain

The power gain is typically 53dB at 400 W level.

○ Simple Cooling System

The tube is 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 the 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.