GENERAL DESCRIPTION
The NEC LD7272 series of PPM focused traveling wave tubes are designed for final amplifier in the earth-tosatellite communications transmitter.
These are capable of delivering an output power of 400 W over the range of 5.85 to 6.45 GHZ and an output power of 400 W over the range of 5.85 to 7.1 GHZ with a power gain of more than 49 dB at any power level.
Furthermore, these are rugged and reliable design offering long life services.

FEATURES
● Lightweight, Compact and Efficient
    The tube has dual-depressed collectors and designed to operate at high efficiency across the power output range. It features state-of-the-art techniques to optimize size and efficiency.
● Low Distortion
    Distortion is a very important factor in multiplex digital signals transmission. NEC has developed techniques for the correction of non-linear distortion and phase generated in a TWT. As a result, the TWT has an optimum performance across a broad power range and is ideally suited for multi-carrier transmission systems.
● Simple Cooling System
    The tube is conduction cooled, so that the cooling system is simplified.
● Rugged Construction
    The power gain 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.
● Micro-discharge 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.