Mod Monitor

[W1RKW]

I'm going to incorporate a modulation monitor in the form of a homebrewed O'scope in my 813 rig and mount this into the transmitter rack since I'll have some extra space to use in the rack.  I'm contemplating having at least 2 or 3 modes to monitor the modulation and other signals.  One mode  being able to monitor the envelope and possibly monitor the modulator audio.  The other is a trapezoid mode.  Need some input on any other monitoring modes I should consider.

[Bacon, WA3WDR]

Having the envelope and trapezoid modes is a good idea.  Maybe a spectrum analyzer mode?

For the trapezoid, don't get the audio from rectified RF output, use a sample of modulated B+ so you can see negative overmod, and the real relationship of modulated voltage to envelope amplitude.

[Rob K2CU]

WHy not have the modulation transformer output be another position similar to RF envelope,...  that is a simple O'Scope mode. You might consider adding a tone generator as well, perhaps a single tone and/or two tone.

[W1RKW]

WHy not have the modulation transformer output be another position similar to RF envelope,...  that is a simple O'Scope mode. You might consider adding a tone generator as well, perhaps a single tone and/or two tone.

Good point.  I'd like to encapsulate any test modes one would use on a transmitter and have it all self contained in one package and then perform any test at the flick of a switch.  The more the merrier. Thanks for the idea.