[R-390] IF Deck Problems Revisited

[David C. Hallam]

I, too, just solved my R-390 IF deck oscillation problem of a different
sort.  I followed the procedure outlined yesterday by Roger, AI4NI, to set
the crystal filter, Z501.  I had been using the procedure given in the
manual to set the crystal filter trimmer null, then could not peak the 1KC
coil, and the deck would go into oscillation.  I must have been doing
something wrong.

Following Roger's suggestion of setting the signal generator to 455.00KC
with the frequency counter and to set the trimmer for null there, I found
the null of the 0.1 pass band came at a significantly different point in the
trimmer's rotation than I had set before, about 60° and now I could peak the
1KC pass band coil.  The oscillation was gone.

Now maybe I can get on with solving the AGC problem.

David
KC2JD

> -----Original Message-----
> From: r-390-bounces at mailman.qth.net
> [mailto:r-390-bounces at mailman.qth.net]On Behalf Of David Wise
> Sent: Tuesday, September 12, 2006 3:56 PM
> To: R-390 at mailman.qth.net
> Subject: RE: [R-390] IF Deck Problems Revisited
>
>
> > -----Original Message-----
> > From: r-390-bounces at mailman.qth.net
> > [mailto:r-390-bounces at mailman.qth.net]On Behalf Of n4buq at knology.net
> >
> > All this time, I was running without the IF can covers in
> > place.  I don't
> >
> > Thanks for all the input.  While my "problem" was probably more just
> > stupidity than anything else, it did help me figure out what
> > was going on.
>
> Ignorance, not stupidity.  Be happy; it's curable.
>
> Dave
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