Atec Agilent-489A-491C-493A-495A - 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 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.
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.
489A 491C 493A 495A
Frequency
Range (GHz) 1-2 2-4 4-8 7-12.4
Gain variation
with freq.
At rated output
Small signal
Across any
10% of band
across full
band
< 6 dB
< 5 dB
< 12 dB
< 6 dB
< 5 dB
< 12 dB
< 6 dB
< 5 dB
< 12 dB
< 6 dB
< 5 dB
for 300 MHz
< 10 dB