Well I did threaten getting the oscilloscope working. I have borrowed the club scope to assist in the calibration, which incidentally seems to have worked a treat.

Not content with seeing volts I wanted to see some modulation. But how to get it into the scope? A google got me to a site that Bob Heil, he of the microphones, had put up a design for a box that takes a sample of the RF from the TX output without blowing up the scope.

So fearing I might be replacing the club one as it went up in smoke I pressed on regardless and using the component tester managed to track down the right capacitors. or in fact two that add up to the right value in parallel. And a trio or resistors that added up to the right sort of numbers.

I got a cast box for RF screening and went about copying the hell plans.



This looks something like this when put together




Then for the big test….or bang.
I got the KX3 out and plugged the tx out into th boxm the other lead into a dummy load and took the scope tap off to one of the scope inputs.

Put the radio onto AM and .1W (just in case) and this is what you get





Pretty eh.. Then SSB



You can’t photograph the slopes that we learnt about well on CW


But they are definitely there.

All in all a great 1 hour project and now I can’t wait to get myself a scope and have someone tell me what I need to be looking for re over modulation etc.