LD7261 Datasheet | NEC

DATA S H E E T HIGH POWER TRAVELING WAVE TUBE FOR MUNICATIONS 20 GHz, 250 W CW, PPM FOCUSING, HIGH POWER GAIN GENERAL DESCRIPTION The NEC LD7261 is a PPM-focused traveling wave tube designed for use as final amplifier in the earth-tosatellite munications 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 d B at 250 W. Furthermore, it is rugged and reliable design offers long-life service. Features ™ High Power Gain The power gain is typically 40 d B 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 munication 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 change without notice. Document No. ET0397EJ1V0DS00 Date Published August 1998 M Printed in Japan © GENERAL CHARACTERISTICS ELECTRICAL Frequency ……………………………………………… 18.0 to 21.7 GHz Output Power ………………………………………… 250 W Heater Voltage ………………………………………… 6.3 V Heater Current ………………………………………… 1.42 A Type of Cathode ……………………………………… Indirectly heated, Impregnated Cathode Warm-up Time …………………………… 300 s MECHANICAL Dimensions …………………………………………… See Outline Weight ………………………………………………… 6.0 kg approx. Focusing ……………………………………………… Periodic Permanent...