A scope can be used with a demodulator, (detector) probe to bring the RF 
signal and modulation into the audio range of the scope.

Sometimes you do not need perfect triggering on the RF; but it is sufficient 
to see the amplitude envelope to tell if you have about the right amount of 
RF voltage for the given application.

So don't give up on the PC scope programs until you try it with a detector 
probe.  There are many suitable probe circuits, Goggle for "RF detector 
probe" and you will  find circuits, articles, and maybe a kit.

-Stuart
K5KVH 


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