[AMRadio] Ranger Modulation


A.R.S. - W5AMI ars.w5ami at gmail.com
Wed Nov 15 23:57:43 EST 2006


You might also try reversing the leads soldered to the cartridge.


On 11/15/06, Larry Taft <ltaft at charter.net> wrote:
> Try reversing the phase of the audio by swapping the output leads of the
> modulation xfmr.
> Asymmetrical modulation?  And too much in the negative direction is the
> flat line.
> Weak tube in the audio chain causing lack of gain needed for the
> positive peak.
> I understand what I'm trying to say.  I reserve my right to say it wrong!
>
> Larry  K2LT
>
> Jack Schmidling wrote:
> > I suspect my mic problem is with the cartridge and I will be getting a
> > new one.
> >
> > The now problem seems to be that I just can not seem to get 100%
> > modulation no matter what mic I use.
> >
> > When I adjust the scope so the carrier is +/- 1 div, I can never get
> > it quite to +/- 2 and 1.5 is pretty typical.
> >
> > On the other hand, I have no trouble getting a flat line between
> > cycles with too much audio which I understand is the indication for
> > over modulation.
> >
> > I am using a audio generator at 1 kHz talking to an earphone, against
> > the mic.  The modulation meter can easily be pinned if I use an
> > amplified mic but it has no effect on the top of the envelop.
> >
> > What does all this mean?
> >
> > js
> >
>
> ______________________________________________________________
> AMRadio mailing list
> List Home: http://mailman.qth.net/mailman/listinfo/amradio
> Partner Website: http://www.amfone.net
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio at mailman.qth.net
>


-- 
"There is nothing more uncommon than common sense." -- Frank Lloyd Wright



More information about the AMRadio mailing list

This page last updated 18 Oct 2017.