KL203-p for QRP SDR use

KennyD · Mar 6, 2015

Hi, I just built a Peaberry SDR for 10 meters and I now need a PA as the radio only produces .091 watts on TX . I have a KL203-p that I put in line to use the pre-amp for the receive and that works well but just as suspected, the Peaberry does not have enough output to drive the KL203-p. However, the radio does key up the TX relay in the amp. My question is, has anyone ever modded a kl203-P to work with less than half a watt of drive? I would really like to do this. I am not concerned with maximum power output from the KL203-p, I'd be happy with 4 watts. I was able to find a schematic for the amp, but I need advice.

Thanks in advance for any help.

doctor · Mar 6, 2015

Ask the expert, cbradiomagazine, and ask him he seems to know a lot about it, .
DOCTOR/795

RatsoW8 · Mar 6, 2015

There's another thread on these amps somewhere. No filtering at all so they will blast out a dirty signal. I do believe 1/2 watt will drive one without any mods and at that output may not be too polluting on the ham bands..

KennyD · Mar 7, 2015

RatsoW8 said:
There's another thread on these amps somewhere. No filtering at all so they will blast out a dirty signal. I do believe 1/2 watt will drive one without any mods and at that output may not be too polluting on the ham bands..

Trouble is I don't have 1/2 a watt to work with. The SDR only puts out around .091w. I also have an external LPF in my feed line. I tried searching this forum but couldn't find what I was looking for.

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KL203-p for QRP SDR use

KennyD

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doctor

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RatsoW8

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KennyD

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