Steve and Katie Dold's web site


Generate Amplifier for the IFR 1200-series

$99 (includes USPS Priority shipping in the US)

This amplifier is designed to be used with the IFR 500, 1200, 1200A, 1200S and 1200 Super-S service monitors. It is used for 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 32 dB (decreasing to 28 dB at 1000 MHz), giving an output of approximately +12 dBm (decreasing to +8 dBm at 1000 MHz).

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. It consists of two off-the-shelf microwave “gain block” amplifier ICs having a total gain of about 32 dB at 50-450 MHz and decreasing to about 28 dB at 1000 MHz. The amplifier has an internal 250 mA fuse to protect the service monitor from damage in the event of an internal failure.

Warranty:  I will repair or replace any defective units at no charge within 1 year of purchase if you call or email me first before shipping the amp to me.


  • Supply: 11-13VDC at about 110 mA
  • Gain: 28-32 dB depending on frequency, 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 is $99 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