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.