|[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
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