S31-500-900P Dual Mode CW/Pulse Solid State Microwave Power Amplifier


0.8 – 3.1 GHz

500 Watts CW / 900 Watts Pulse

Amplifier Features:

  • Solid State Design
  • Rugged Construction & High Reliability
  • Instantaneous Broadband Frequency range
  • Backlit screen
  • Modular Design Construction
  • Integrated Force Air Cooling
  • Self-diagnostic circuitry
  • IEEE-488 interface & RS232 Remote

s31-500-900p SMInstruments for Industry, S31-500-900P Solid State amplifier is state-of-the-art and provides outstanding RF performance. The S31-500-900P amplifier operates over the frequency range from 0.8 – 3.1 GHz and supplies 500 watts CW / 900 watts Pulse offering all the control and communication features needed for today's automated test systems. From the ground up, the S31-500-900P amplifier is built to withstand rugged handling, whether it's being shipped to you or hauled from site to site. They feature heavy-duty aluminum chassis construction with a modular approach for easy access and service. The S31-500-900P is perfectly suited for automotive testing as well as general purpose industrial applications.

Operation safety and ease of use are paramount in IFI product designs. The IFI S31-500-900P amplifier includes a full complement of RF and hardware protection circuits including high VSWR, over-current,voltage protection, redundant thermal and airflow sensors for the module and the system level. In addition, the S31-500-900P includes a state-of-the-art interface that is sophisticated, comprehensive, and yet simple to use.

The backlit LCD screen shows forward/reverse power indication, system status and self-diagnostic information. Peak power metering is incorporated to measure forward and reflected power while in the pulse mode. All the amplifiers operating parameters are simultaneously available in the amplifier front panel display as well as over the remote bus. Selection switches allow you to switch the amplifier to the desired mode of operation for local control if the unit is not being operated remotely.

For computer automation both an RS-232 and IEEE interface are provided as standard. To meet individual application needs, the S31-500-900P Series amplifiers can be easily customized with other options. With this capability and its reliable elegant design, the S31-500-900P series amplifiers are the perfect system for your applications.

Model Number Frequency Range
Rated Power
(watts min.)
P1dB Power
(watts min.)
(dB min.)
Size (Inches)
(W x D x H)
S31-500-900P 0.8 – 3.1 500 CW 900+ Pulse 400 CW 60 3 CW 120 19 x 24 x 7 PS
19 x 24 x 10.5 PA


Standard Features for IFI S31-500-900P Dual Mode Solid State Amplifier

  • VSWR Reflected Power Protection, the unit operates without damage or oscillation into any magnitude of phase or load impedance, Open and Short Circuit Protection.
  • * Alternate Prime Power (specify at time of order)
  • GPIB IEEE 488 and RS232 Remote Control
  • RF Sample Port on the Front Panel, 112R for rear panel
  • Internal Pre-amplification to obtain rated output power with an input level of 0 dBm or less.
  • Gain Control Local and Remote, 30 dB range
  • RF Input/Output Connectors on the Front Panel, 118R for rear panel
  • Internal Systems Diagnostics and Status Indicators
  • Total/Operate Elapsed Time Metering in hours
  • RF Safety Interlock
  • Forward/Reflected Power Indication simultaneously on Front Panel display


IFI S31-500-900P Series Solid State Amplifier Specifications

  • Frequency Range: 0.8 – 3.1 GHz
  • Rated Output Power: 500 Watts CW / 900 Watts Pulse
  • Gain @ Rated Power: 60 dB
  • Prime Power: As Required (Some are listed below)
  • Input/output Impedance: 50 ohms
  • RF Input/ Sample Connectors: Type N Female, unless specified otherwise
  • RF Output Connector: Type N Female, other connectors available by request or specification
  • Input VSWR: 2.0:1
  • Output VSWR: 2.5:1
  • Operating Temp: 0º to 50º C
  • Non-operating Temp: -40º to 70º C (50,000 feet maximum)
  • Humidity: 95% without condensation
  • Altitude: 10,000 feet
  • Cooling System: Air cooled, self contained
  • Modulation: AM, FM, Pulse
  • Configuration: Rack Mount as specified in Model Table, or Rack/Cabinet Integrated
  • Spurious Outputs: <-60 dBc nominal
  • Harmonics: -20 dBc minimum @ Linear Power
  • Pulse Input: BNC Female Front Panel {+5 volts into 50 ohms}
  • Pulse Width: 100 ns – 100 usec
  • PRF Range: 0 – 100 kHz Standard, Higher PRF ranges available
  • Duty Cycle: 10% Standard
  • Rise & Fall Time: 15 ns nominal; 25 ns maximum
  • Pulse to Pulse Jitter: <0.1 dB
  • Pulse Width Jitter: +/- 5 ns maximum
  • Pulse Delay: 500 ns maximum / 300 ns typical
  • Pulse Droop: 0.5 dB/100 usecs, 0.1 dB/10 usec
  • Pulse On/Off Ratio: 80 dB
  • Pulse to Pulse Stability: 0.2 dB
  • Standard Prime Powers:
    100, 115, 120 VAC ±10% 50/60 Hz, single phase
    220, 230, 240 VAC ±10% 50/60 Hz, single phase
    120/208 or 200/220/230/240 VAC ±10% 50/60 Hz, three phase Wye or Delta power is available
    200/220/230/240 VAC ±10% 50/60 Hz, three phase Wye or Delta power is available
    • Special Prime Powers other then listed are subject to availability

Some Available Options for IFI S31-500-900P Series Solid State Amplifiers

  • Option 110-1E: GPIB IEEE-488 RS232 and Ethernet Remote Control
  • Option 110-2: GPIB IEEE-488 and RS 422 Remote Control
  • Option 110-3: GPIB IEEE-488 and RS 485 Remote Control
  • Option 113: Chassis slides for a 19" rack mounting
  • Option 118A: RF Input On Front Output On Rear
  • Option 118B: RF Input On Rear Output On Front


Instruments For Industry

903 South Second Street • Ronkonkoma, NY
(631) 467-8400 • Fax: (631) 467-8558 
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