I have been wanting to replace the tube amp I built ages ago for the FM10c exciter because it is kind of overkill for a few watts. So I designed this out of some random parts and it provides a perfect 2 watts of power from 10mw directly off of the ramsey fm10 board. Note that the FM10 (revision c) was modified with the well known modifications, like adding an RFC to the output transistor and the 200 ohm resister, along with hooking up a variable capacitor to be able to hand tune the transmitter via a dial rather then the tuning tool ramsey includes with it.
So here is the schematic...
and a picture of the quick and dirty amp...
I don't recommend anyone else build this because I built it out of scrap parts. The design may work for others but don't count on it . It may give some good ideas for your own designs though. The 2SC2314 works pretty well at VHF but gets noisy if overdrivin which is why I added a trimmer at it's base input. I am thinking of upping the power to the circuit, but that's for some other time. Right now those 2 and some watts of power is covering most of my town nicely.
Picture description: You can see the FM10c mounted vertically and the antenna output going directly to the amp board. To the right of the amp perf board is the varicap tuner to tune the FM10c signal on spot. Just thought I'd share because pics are fun
. It may give some good ideas for your own designs though.
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