Steve and Katie Dold's web site


Generate Amplifier for the IFR 1200-series

This amplifier is designed to be used with the IFR 500, 1200, 1200A, 1200S and 1200 Super-S service monitors. It is used whenever more than -20 dBm is needed from the RF Generator function of the service monitor, such as when generating over-the-air signals into distant receivers or tuning filters, especially deep notch filters that require more than the standard generator provides. It plugs into the monitor's generate output port and power jack and amplifies the generated signal by about 32 dB, giving an output of approximately +12 dBm.

This amplifier is similar to IFR's “Option 5” 30 dB Generate Amplifier, but does not have the internal relay and receiver port connection of the IFR factory amplifier. Instead of discrete components, it uses two microwave “gain block” 16 dB amplifier ICs. An internal 250 mA fuse protects the service monitor from damage in the event of an internal failure.


  • Supply: 11-13VDC at about 110 mA
  • Gain: about 32 dB, see S21 (gain) plot below
  • P1dB: 17 dBm (the point at which the output goes 1 dB into compression)
  • Freq. Range: 10-1000 MHz

Price if ordered direct from me is $89 which includes USPS Priority Mail shipping in the U.S.
Outside the U.S. the price is $99 USD plus shipping.
I can take a check or Paypal (please call or email me for the paypal payment address)

Contact info:

Steve Dold (W6KCS)
705 Wiegand Way
Dixon, CA  95620
(916) 273-4451
w6kcs (at) stevedold (dot) com (If your email bounces or I don't answer within a day or so, please try again. My server is somewhat unreliable.)

Click on the following thumbnails for more images and network analyzer plots:

Inside view
Gain (S21)
Input return loss (S11)
Output return loss (S22)
Input impedance
Output impedance