Atec Agilent-489A, Agilent-491C, Agilent-493A, Agilent-495A User Manual

HP MODELS 489A, 491C, 493A & 495A

Microwave power amplifiers 1 to 12.4 GHz, 1 Watt

Microwave TWT Amplifiers

Amplification of frequencies from 1 to 12.4 GHz is accomplished in four ranges by the HewlettPackard 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.

489A – 495A Specifications

Output power: 1 watt for an input of 1 miliwatt GAIN: 30 dB at rated output Input/Output: Impedance 50 Ohms; Connectors: Type N female Noise Figure: >30dB Amplitude Modulation:

Sensitivity: modulation input of > -20V peak reduces FR output by > 20dB from dc

to 50 ohms.

Freq. Response: dc to 500 KHz (3dB). Size: 5.5”x 16.75”x18.375” Weight: 33 Lbs.

Frequency Range (GHz) Gain variation with freq. At rated output Small signal Across any 10% of band

across full band

489A 491C 493A 495A

1-2

< 6 dB

< 5 dB

< 12 dB

2-4

< 6 dB

< 5 dB

< 12 dB

4-8

< 6 dB

< 5 dB

< 12 dB

7-12.4

< 6 dB

< 5 dB

for 300 MHz

< 10 dB