LD7237

DATA S H E E T HIGH POWER TRAVELING WAVE TUBE FOR DBS GROUND TERMINALS LD7237 DBS Band, 400 W CW, PPM FOCUSING, HIGH POWER GAIN 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. For safe use of microwave tubes, refer to NEC document “Safety instructions to all personnel handling electron tubes” (ET0048EJ∗V∗UM00) The information in this document is subject to ch...