Contact us 800.813.8448

Recently added item(s) ×

You have no items in your shopping cart.

Amplifier Research 250S1G4 RF Power Amplifier; 250 watt CW, 0.8 to 4.2GHz

Model Number: 250S1G4

View Price / Get Quote

Amplifier Research 250S1G4 RF Power Amplifier

Click on above image to view full picture

  • Amplifier Research 250S1G4 RF Power Amplifier


  • Quote to Rent/Lease
  • Quote to Purchase

250 Watt CW, 0.8 - 4.2 GHz (w/ DCP, IEEE, RS-232, USB, Ethernet & Fiber Optic interfaces)

The Model 250S1G4 is a portable, self-contained, air-cooled, broadband, completely solid-state amplifier designed for applications where instantaneous bandwidth, high gain and linearity are required. Push-pull circuitry is utilized in all high power stages in the interest of lowering distortion and improving stability. The Model 250S1G4, when used with a sweep generator, will provide a minimum of 250 watts of RF power.

The Model 250S1G4 is equipped with a Digital Control Panel (DCP) which provides both local and remote control of the amplifier. The DCP uses a graphic liquid crystal display, menu assigned softkeys, a single rotary knob, and four dedicated switches (POWER, STANDBY, OPERATE and FAULT/RESET) to offer extensive control and status reporting capability. The display provides operational presentation of Forward Power and Reflected Power plus control status and reports of internal amplifier status. Special features include a gain control and RF output level protection.

All amplifier control functions and status indications are available remotely in GPIB/IEEE-488 format, RS-232 hardwire and fiber optic, USB, and Ethernet. The bus interface connector is located on the back panel and positive control of local or remote operation is assured by a Local/Remote switch on the front panel of the amplifier.

The low level of spurious signals and linearity of the Model 250S1G4 make it ideal for use as a driver amplifier in testing wireless and communication components and subsystems. It can be used as a test instrument covering multiple frequency bands and is suitable for a variety of communication technologies such as CDMA, W-CDMA, TDMA, GSM etc. It is also suitable for EMC Test applications where undistorted modulation envelopes are desired.

The 250S1G4 has the ability to be upgraded at a later date to the Model 350S1G4, 350 watt amplifier. Upgrading to the Model 350S1G4 allows for future upgrades by utilizing our Expandable Power Technology.

Test Standards
  • RATED OUTPUT POWER: 250 watts minimum
  • INPUT FOR RATED OUTPUT: 1.0 milliwatt maximum
  • POWER OUTPUT @ 3dB COMPRESSION, Nominal: 280 watts
  • POWER OUTPUT @ 3dB COMPRESSION, Minimum: 240 watts
  • POWER OUTPUT @ 1dB COMPRESSION, Nominal: 240watts
  • POWER OUTPUT @ 1dB COMPRESSION, Minimum: 200 watts
  • FLATNESS: ±2.0dB typ, ±2.5dB maximum
  • FREQUENCY RESPONSE: 0.8 to 4.2GHz instantaneously
  • GAIN: 54dB at max setting
  • GAIN ADJUSTMENT: 15dB minimum
  • INPUT IMPEDANCE: 50 ohms, VSWR 2.0:1 maximum
  • OUTPUT IMPEDANCE: 50 ohms nom
  • MISMATCH TOLERANCE: 100% of rated output power; will operate without damage or oscillation or foldback with any magnitude and phase of source and load impedance
  • MODULATION CAPABILITY: Will faithfully reproduce AM, FM, or pulse modulation appearing on the input signal
  • HARMONIC DISTORTION: -20dBc maximum at 225 watts
  • MAINS: 120 to 240/180 to 270VAC autoranging; 50/60Hz, single phase, 1450 watts
  • COOLING: Forced air (self contained fans)
  • RF CONNECTORS: Type-N on front panel


  • 250S1G4: Input Type-N female on front panel, Output Type-7/16 female on front panel; 50.3 x 55.9 x 61cm, 19.8 x 22 x 24in
  • 250S1G4M1: Input: Type-N female on rear panel, Output Type-7/16 female on rear panel; 50.3 x 55.9 x 61cm, 19.8 x 22 x 24in
  • 250S1G4M2: Same as 250S1G4; no enclosure for rack mounting, 48.3 x 53.3 x 61cm, 19 x 21 x 24in
  • 250S1G4M3: Same as 250S1G4; no enclosure for rack mounting, 48.3 x 22.25 x 43.2cm 19.0 x 8.75 x 17.0in
  • 250S1G4M4*: Type-N female on rear panel; 56.1 x 82.6 x 65.9cm, 22.1 x 32.5 x 26in
  • 250S1G4M5**: Type-N female on rear panel; 50.3 x 149.9 x 61cm, 19.8 x 59 x 24in

*Equipment rack with casters

**Model is housed in a 525S1G4/700S1G4 chassis to allow future upgradeability to either a 525 watt or a 700 watt model

Standard Accessories Included
  • Calibration certificate
  • Manual
  • Power cord
  • All standard accessories

Request a Quote