[AMRadio] Use of an oscilloscope to monitor am audio


SBJohnston at aol.com SBJohnston at aol.com
Sat Mar 18 13:47:46 EST 2006


The 453 is limited as to frequency response if I recall correctly, so it may 
only be useful on the lower bands for RF displays via the horizontal input.  

If the scope has an X/Y mode, you can go beyond the usual envelope pattern 
you get from putting RF on the X input... In my professional work with AM, I 
find you can get a very useful pattern by putting RF on the X input and 
line-level modulating audio on the Y.   It forms an ellipse that closes on 100% 
negative.  I find it easier to see the compression/limiting action as shades of 
intensity on this waveform.

Steve  WD8DAS

sbjohnston at aol.com




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