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The 493A TWT Amplifier covers the 4 to 8 GHz frequency range with a maximum gain of 30 dB, maximum output power of 1 W FOR A INPUT OF 1 MILLWATT into 50-ohm load. Noise figure <30 dB Type N connector HP MODELS 489A, 491C, 493A & 495A Amplification of frequencies from 1 to 12.4 GHz is accomplished in four ranges by the Hewlett-Packard medium power microwave amplifiers. Each delivers at least 1 watt for a 1 milliwatt input a gain of at least 30dB. All four TWT amplifiers have provisions for amplitude modulation, and since the internal modulation amplifier is dc-coupled, remote programming and power leveling are possible. Sensitivity is high for large output power changes from relatively small modulation signals, obviating the need for an external modulation amplifier. The dc amplifier has a gain of 20 dB and exhibits a passband from dc to 500 KHz when modulation index in the neighborhood of 1 dB, as might be encountered in RF leveling. When the modulating levels are high, in the region of 20 Volts, the passband will be a minimum of 100 KHz: a 20 volt change at the MOD INPUT produces a minimum of 20 dB off/on ratio. 1 watt for an input of 1 miliwatt Impedance 50 Ohms; Connectors: Type N female modulation input of > -20V peak reduces FR output by > 20dB from dc (Hp microwave amplifier 4-8 ghz model 493A tested was posted and is owned by: Rosa Larson) |
rlarson@chicagopartsnetwork.com (Rosa Larson) for more information.
