[AMRadio] Re: Modulation transformer ID and repair

[Brett Gazdzinski]

WA3JVJ bought 3 or 4 cvm5 mod transformers, and gave me one.
Out of the 4, he happened to give me one that is totally
quiet all the time, dc through it or not...

Brett
N2DTS

> -----Original Message-----
> From: amradio-admin at mailman.qth.net
> [mailto:amradio-admin at mailman.qth.net]On Behalf Of Donald Chester
> Sent: Tuesday, November 25, 2003 6:49 PM
> To: amradio at mailman.qth.net
> Subject: RE: [AMRadio] Re: Modulation transformer ID and repair
> 
> 
> 
> 
> >I cant say removing the current from the cvm5 seemed to help 
> the sound
> >of the rig much.
> >
> 
> I tried it with an older version, the VM-5.  It didn't 
> radically affect the 
> sound of the rig over the air, but with the DC thru the 
> winding, it talked 
> back like a speaker in the transmitter cabinet.  I couldn't 
> crack up the 
> audio without accoustical feedback.  With the  reactor, the 
> VM-5 was quiet 
> as a mouse, and the waveform at low audio frequencies (< 
> 100~) looked more 
> symmetrical on the scope.  I haven't run DC through a 
> modulation transformer 
> secondary since about 1963.
> 
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