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Title: Mod Monitor Post by: W1RKW on December 12, 2006, 04:06:31 PM 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.
Title: Re: Mod Monitor Post by: Bacon, WA3WDR on December 12, 2006, 06:10:00 PM 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. Title: Re: Mod Monitor Post by: Rob K2CU on December 13, 2006, 06:28:09 AM 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.
Title: Re: Mod Monitor Post by: W1RKW on December 13, 2006, 03:53:55 PM 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. |