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Has anyone used a KX3 with the QRP Labs 59 watt amp? ?If so, how did you do it?

Hi I have used this but CW only, The KX3 has superb power control

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73

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Andrew

Andrew, ?Thanks. Yes, CW only. I should have stated that in the question.?

I added this mod inside my 50W amp to add low-active PTT capability without disturbing the existing high-active PTT.? Then I wired up a PTT cable that connected the KX2's PTT signal to the tip of the cable's 3.5 mm plug.? I'm guessing it's that same as what would be needed for the KX3.

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This looks like a great method and eliminates the box I was working on to go between the KX3 (ACC2) and the amp. ?Thank you! ?I knew there was a brain-trust out there.?

You're welcome ... and here is a photo showing how I built it.

Perfect. No perf board required.?

Just remember to turn the power down on the KX3. The 50W PA is not meant to handle over 5 watts input. Bad things will happen including blowing up the IFR510 transistors and various diodes. Ask me how I know!

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Steve N9SZ

Thanks, Steve. Always a good reminder. I never give the amp more than 3 watts. I seldom push it to 50 watts out anyway.?