Hi Everyone, I could use some help to get my KX1 working again please.
I built my KX1 just over a year ago including the 80/30 option. It has worked fine till this week. I was never satisfied with the output power and decided to see if I could improve it a little.
Disaster strikes, I touched something with my multimeter probe on the output transistor Q6, I think, and the smoke escapes. Oh no!
I check the board and a trace is burnt between T1 pin 4 and R4 power adjust resistor, I make the repair to the board and switch on RX is ok but no TX, the side tone is working and led is doing everything it should. I have a few spares so replaced Q6 no change, then Q5 and Q4, Q5 had failed but still no output. Last go I change Q1 still zero output. I removed R4 the power adjust resistor and that showed 100 ohm down to zero.
I have limited skills and equipment ( multimeter frequency counter) I checked voltages all seem ok current at RX is 0.45mA and TX 1.03mA, My main station radio can hear a signal on all bands when placed right next to the KX1 and my frequency counter says it's the correct frequency at the antenna output. My power meter is not very accurate but the needle is not moving on the meter (I checked it with another 5 watt radio).
I have been looking at things for a week now and decided to order a few parts to make an RF probe that connects to my multimeter. Can someone please suggest suitable test points and some idea what to expect.
In short everything is working but output power is so small I can't measure it on all bands. Any guidance/suggestions would be appreciated.
Mike G0HIO
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