[R-390] Broadcast Band On Other Bands

[blw]

Yes, mine is a 56 Motorola and you described the effect better. It is a
sudden gain without noise or harmonics. I have not had the IF or RF deck out
to check manufacturers, but I am betting they are Motorola modules based on
consistent metal work, lettering, and MFP type.  It is pretty easy to look
at everything and come to the conclusion everything was manufactured at the
same plant. The PS and audio deck are Motorola. I am using an EAC audio deck
at the moment until I can recap and replace resistors in the original. So,
the audio deck is eliminated as cause of this phenomena.


Barry


> Mine does the same thing.  It's almost like it gets a sudden 10dB gain.  Is
> yours a '56 Motorola?  I wonder if it's manufacturer/contract specific.
> 
> Barry(III) - N4BUQ
> 
> 
> 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