Amplifier Research

Amplifier Research 125S1G4

RF Amplifier 0.7 GHz - 4.2 GHz 125W
0.8 GHz – 4.2 GHz Frequency Range
125 Watts CW Minimum Output Power
50 dB minimum Gain
±3 dB maximum Gain Flatness
0 dBm maximum Input for Rated Output
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Attribute Value
Frequency Range 0.8 GHz – 4.2 GHz
Minimum Output Power 125 Watts CW
Gain 50 dB minimum
Gain Flatness ±3 dB maximum
Input for Rated Output 0 dBm maximum
Input VSWR 2.0:1 maximum
Output VSWR 2.0:1 maximum
Harmonic Distortion -10 dBc maximum at rated output
Power Requirements 220 VAC, single phase, 50/60 Hz
Cooling Forced air cooling
Amplifier Research 125S1G4 Options:
  • 125S1G4 - 125S1G4 - Standard: N Female connectors front-mounted (RF Input & Output), with instrument case, 44kg (97lbs), 50.3 x 30 x 61cm
  • 125S1G4 - M1 - N Female connectors rear-mounted (RF Input & Output), with instrument case, 44kg (97lbs), 50.3 x 30 x 61cm
  • 125S1G4 - M2 - N Female connectors front-mounted (RF Input & Output), rack mount (no instrument case), 33.1kg (73lbs), 48.3 x 26.7 x 61cm
  • 125S1G4 - M3 - N Female connectors rear-mounted (RF Input & Output), rack mount (no instrument case), 33.1kg (73lbs), 48.3 x 26.7 x 61cm
Calibration Form Amplifier Research 125S1G4

Repair Form Amplifier Research 125S1G4
Maximum file size: 40MB

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Model125S1G4

The Amplifier Research 125S1G4 is a portable, air-cooled, solid-state amplifier delivering 125 watts of RF power across 0.7–4.2 GHz with outstanding linearity and stability. It features push-pull circuitry, an advanced digital control panel, gain adjustment up to 15 dB, and extensive remote interfaces including GPIB, RS-232, USB, and Ethernet. With low spurious signals and harmonic distortion, it ensures reliable and precise RF performance for demanding applications.

Ideal for EMC testing, wireless communication systems, and driver amplifier applications, the Amplifier Research 125S1G4 supports AM, FM, and pulse modulation with excellent accuracy and minimal distortion. Its rugged design allows operation under any mismatch conditions without damage.

Testwall can supply the used Amplifier Research 125S1G4, fully tested. With expert support and global delivery, Testwall ensures high-performance instrumentation with unmatched reliability and service quality. Please contact us directly if you need calibration or repair of the Amplifier Research 125S1G4.

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