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Generate Amplifier for the IFR 1200-series |
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Please note: I am no longer shipping these internationally. I will only ship these to US addresses.I designed and built these amplifiers to be used with the IFR 500, 1200, 1200A, 1200S and 1200 Super-S service monitors to amplify the -20 dBm generate level to +10 dBm or more. They are similar to IFR's “Option 5” 30 dB Generate Amplifier, which was a very useful amplifier but is becoming hard to find. This amplifier does not have the internal relay and receiver port connection of the Option 5 factory amplifier, which was used to connect the amplifier output port to the monitor's receiver port during receive mode operation. It is a straight generate amplifier that will allow you to key and test distant repeaters using an outside antenna. It is also useful for tuning filters, especially deep notch filters that require more than the standard generator provides.Like IFR's Option 5, it plugs into the generate output port (the “T/R” connector) and power jack on the service monitor and amplifies the generated signal by about 35 dB, giving an output of approximately +15 dBm from 10 MHz to about 700 MHz, decreasing to about 30 dB at 1000 MHz (See "S21" gain plot in the pictures). It uses two off-the-shelf microwave gain block amplifier ICs that, like all of the parts, are replaceable with average SMD soldering skills. The DC power input has a self-resetting fuse to protect the service monitor from damage in the event of an internal failure of the amplifier. The housing is rugged aluminum that is gold Alodined. Full documentation is included, including schematic and parts list. All parts are commonly available from Digi-Key and other sources. Note to IFR 1500, A7550 and A8000 owners: This amp is not a good fit because the spacing between the DC power pin and the RF input connector is not the same as on the 1200. Also, those units already put out 0 dBm, so the full gain of this amp would not be realized since its 1 dB compression point is only +17 dBm. 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. For non-warranty repairs (keyed-into, etc) I will be happy to repair the amplifier for a flat fee of $20 plus return shipping. Even if the unit is not defective, I will be happy to buy it back for any reason if you return it to me within 30 days, even if you simply decide you didn't need it after all or that it doesn't do what you wanted. I want you to be happy with your purchase.
Price if ordered direct from me is $109 which includes USPS Priority Mail shipping in the U.S. Contact info: Steve Dold (W6KCS) Input (S11) and output (S22) smith chart plots
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