RF amp to go from 0 to about 10 or so dBm @ 136kHz?

[Chris Wilson]

I need to build or buy a simple amp to increase the output of my Kenwood TS-590 transceiver. It only transmits via the "DRV OUT" socket at 136kHz, at 1mW (0dBm). I need to feed it into the circuit in the link below, a frequency doubler, that needs about 10 to 17 dBm drive power. Any links to anything to build or buy please?

The device I need to feed the signal through is shown here:

http://www.w1vd.com/X2LinearClassDinterface.html

[SeanB]

You can use a CFB opamp, or any opamp with a GBW product over 1GHz, or just use  a few simple common emitter transistor stages ( your choice of tuning them to make a band pass filter, but that would be good on the final stage or so) cascaded together to get the required gain, and with the final stage being an emitter follower ( which will drop some gain, but gives a useful current boost to drive the transformer) to drive the frequency doubler reliably. Probably 3 stages in total.

Try this one.....

http://www.w1vd.com/VLFLFMFpreamplifier.pdf

[dannyf]

RF amp to go from 0 to about 10 or so dBm @ 136kHz?

136Khz is nothing - even the slowest of the slow small signal transistors will do.

If you want fancy (optionality later), use mmic -> 17db is fairly standard for those things.

But really, a transistor is all you need.

[dannyf]

BTW, what is this all about? I thought you were trying to divide some frequencies and now you are trying to multiply some frequencies?

Rather than showing people pieces of what you are trying to do and going down the wrong path, you may want to show people also the big picture and maybe there are better / different ways to get you where you want to go.