LD7215 Datasheet | NEC

DATA S H E E T HIGH POWER TRAVELING WAVE TUBE FOR GROUND TERMINALS LD7215, LD7215C, LD7215D 6 GHz, 3 k W, HELIX TYPE, PPM FOCUSING, HIGH POWER GAIN, FLAT GAIN VARIATION GENERAL DESCRIPTION The NEC LD7215, LD7215C and LD7215D are PPM-focused traveling wave tubes designed for use as the final amplifiers in the earth-to-satellite munications transmitter. These are capable of delivering an output of 3 k W over the range of 5.85 to 6.425 GHz. They provide a high power gain of 46 d B at an output power of 3 k W, and flat gain variation of 2.5 d B by LD7215, 1.0 d B by LD7215C and LD7215D at small signal level in the full frequency range. Furthermore, they are of rugged and reliable design offering long-life service. Both LD7215 and LD7215D are fully patible with TH3640. Features ™ High Power Gain The power gain is typically 52 d B at small signal level and 46 d B at 3 k W Ievel. ™ Simple Cooling System All the tubes are forced-air-cooled, so that the cooling system is greatly simplified. ™ PPM Focusing The tubes are PPM (Periodic Permanent Magnet) focused, and eliminate entirely the requirement for focusing power supplies and interlock circuits. ™ Long Life and High Stability The tubes employ advanced impregnated cathode with a low operating temperature for long life. ™ Microdischarge Free The tubes are carefully designed to be free from microdischarge in the electron gun for long term operation, therefore they are suitable for use in 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. ET0139EJ5V0DS00 (5th edition) Date Published August 1998 M Printed in Japan © LD7215, LD7215C, LD7215D GENERAL CHARACTERISTICS ELECTRICAL Frequency ……………………………………………… 5.85 to 6.425 GHz Cathode ………………………………………………… Indirectly heated, Impregnated Heater Voltage …………………………………… 6.3 V...