[R-390] R-390 slugs

[Jim Temple]

Well, I have been going over the Yahoo archives and it seems that there is
no easy way to judge what slugs and coils match in the R-390.  There was
considerable discussion about color codes, etc.  Everything you ever wanted
to know about R-390 slugs is discussed in the April 1999 time frame, give or
take a couple of months, in the Yahoo archives, except the final, definitive
answer.  So it seems there is no real answer, beyong going back in time to
question the manufacturers of these items. :-)

Jim

----- Original Message -----
From: "Jim Temple" <jetemp@insightbb.com>
To: <r-390@mailman.qth.net>
Sent: Tuesday, April 30, 2002 10:58 PM
Subject: Fw: [R-390] Question about R-390 (Non A)


>
> ----- Original Message -----
> From: "Jim Temple" <jetemp@insightbb.com>
> To: "Paul H. Anderson" <pha@pdq.com>
> Sent: Tuesday, April 30, 2002 10:56 PM
> Subject: Re: [R-390] Question about R-390 (Non A)
>
>
> > All the slugs, except one, had some kind of brown shellac coating them.
> One
> > was black on the 16-32 slug rack.  I swapped this one with the one coil
> slug
> > that was unstable, and the peaking instability went away.  Perhaps
> somewhere
> > along the way, the slugs were exchanged, hurting the stability of the
> unit.
> > It would be nice to have a comprehensive tally of the various
combinations
> > of slugs available in the R-390.
> >
> > Jim
> >
> > ----- Original Message -----
> > From: "Paul H. Anderson" <pha@pdq.com>
> > To: "Jim Temple" <jetemp@insightbb.com>
> > Sent: Tuesday, April 30, 2002 10:55 AM
> > Subject: Re: [R-390] Question about R-390 (Non A)
> >
> >
> > >
> > > You're ahead of me on the 390 alignment, but one thing I do know is
that
> > > there are at least three different types of slugs for the RF deck -
and
> > > can for can, they change depending on the mod level.
> > >
> > > I'm away from my manual, but the 1962 390 manual (tm 11-5820-357-35)
has
> > > some info about slug changes.  David Medley had knowledge about them,
I
> > > think, but didn't make it clear to me if he knew which color slug went
> > > where, or even if there was a scheme for that.
> > >
> > > We really, really (as a group) need to figure this out if we can - I
> > > suspect a lot of 390/391's are suffering from mismatch of RF deck
slugs.
> > >
> > > Paul
> > >
> > > On Tue, 30 Apr 2002, Jim Temple wrote:
> > >
> > > > Things have been a little slow, so thought I would ask a couple of
> > > > questions.
> > > >
> > > > 1.  After aligning the RF section, the calibrator signal peaks at a
> > > > different position than where the antenna coils aligned.  I did make
> > sure
> > > > that the antenna trimmer was at half mesh and did not touch it
during
> > the
> > > > complete alignment.  Now, the antenna peaks at "0" and the
calibrator
> > will
> > > > only put out about 1 volt diode load voltage.  The diode load will
> peak
> > at
> > > > about 5 volts if I peak the antenna trimmer, which ends up at about
2
> > > > O'clock.  I tried to leave the antenna trimmer in the position where
> the
> > cal
> > > > is peaked, and realigning.  The realignment went fine, but the cal
> > signal is
> > > > still displaced at about 2 O'clock.  Adjusting the two trimmers on
the
> > > > Calibrator deck does nothing to move the peak to coincide with the
> > antenna
> > > > peak.  Does this anomaly suggest off value parts in the calibrator
> > deck??
> > > > Perhaps this is normal for the R-390?  On my R-390A both coincide
> > perfectly.
> > > >
> > > > 2.  On bands below 16mhz, the antenna trimmer will peak with
internal
> > noise.
> > > > At 16mhz and above, I can not detect a peak with internal noise.
> > However,
> > > > it will peak with an incoming signal.  My R-390A will peak with
> internal
> > > > noise on all bands.  Again, is this normal for an R-390?  I
understand
> > that
> > > > the 16-32 coils, in earlier units, might have slugs and coils that
do
> > not
> > > > realize the total potential that later units have.  Has anyone heard
> of
> > > > this?
> > > >
> > > > Thanks for your past support.
> > > >
> > > > Regards,
> > > >
> > > > Jim
> > > >
> > > >
> > > >
> > > > _______________________________________________
> > > > R-390 mailing list
> > > > R-390@mailman.qth.net
> > > > http://mailman.qth.net/mailman/listinfo/r-390
> > > >
> > >
> > > +---------------------------------------------------+
> > > | Paul Anderson           Public Data Queries, Inc. |
> > > | pha@pdq.com             734-213-4964 x308         |
> > > +---------------------------------------------------+
> > >
> > >
> >
>
>
> _______________________________________________
> R-390 mailing list
> R-390@mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/r-390
>