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