[R-390] Broadcast Band On Other Bands

[Tom M.]

Sounds like you either had a component failure in the RF section, or the RF is
out of alignment.

The RF section has to track with the PTO and variable IF.  You can tell if you
can benefit from an RF alignment by slightly turning the MCS knob.

If you turn it half way to the adjacent band, it will move the slug rack a tad
prior to changing xtal position.  Try this and see if you get an increase on
the signal meter.  If you get an increase, then you need an RF alignment (at
minimum).

73 Tom N5OFF
--- blw <ba.williams@charter.net> wrote:
> 
> > My R-390A was operating normally on 3870 but after a fairly loud audio
> click
> > overlapping local broadcast stations could be heard.  With some tuning
> > around these "stations" occur at various places on several bands, noteably
> > the 3, 13,14,15 Meg bands, maybe others.  It's hard to tell if the selected
> > frequency is being received.  The 1 to 2 Meg band seems OK.
> > 
> > Ideas before the trouble shooting begins?
> > 
> > Mike VE7MMH
> 
> 
> Mike,
> 
> This makes me think of several things. First, I sometimes get a sudden pop
> of louder audio especially if I've had the radio parked on a frequency for a
> long time. Something seems to open up somewhere for full audio. It has been
> going on for a few years now. Turning up the RF Gain usually gives me full
> audio again, or turning the MC Change knob up or down a band will do it. I'm
> pretty sure that the racks are moving loose enough to not bind like they do
> on my other one. Sometimes I get the impression that crud on the Local Gain
> and RF Gain pots is causing the problem.
> 
> Maybe some of these stations are harmonics?
> 
> 
> 
> Barry
> 
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