GENERAL DESCRIPTION
The NEC LD7263 is a PPM-focused traveling wave tube designed for use as final amplifiers in the earth-tosatellite communications transmitter.
This is capable of delivering an output power of 750 W over the range of 1 3.75 to 14.5 GHZ and provides a power gain of more than 47 dB at 750 W Ievel.
Furthermore, this is of rugged and reliable design offering long-Iife service.

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.