[R-390] R-390A trouble

[Jim Temple]

OK, I replaced C227 .047.  The old one measured .075 when out of circuit.  I
have a picked-over RF parts deck that happend to have this cap.  It measured
.04745, so hopefully this is the problem.

HOWEVER, I am going to clean, inspect, wiggle, tap, eyeball, and generally
give it the twice over before reinstalling in the morning.  I'm winding down
for the night.

Will report back after reinstallation of the RF deck in the morning.

Thanks for the great support and suggestions.  Good night.

Regards,

Jim
73, KF4ICZ

----- Original Message -----
From: "Barry Hauser" <barry@hausernet.com>
To: <bill@iaxs.net>; "Jim Temple" <jetemp@insightbb.com>;
<r-390@mailman.qth.net>
Sent: Thursday, March 28, 2002 9:55 PM
Subject: Re: [R-390] R-390A trouble


> > Barry, I think you've got it.
> >
> > But I thought of another thing to try. Because the set is
> > oscillating within itself, something common to the IF and
> > RF decks is carrying energy between them.
> <snipped>
>
> Got what?  I dunno, but, hey, Bill, I think YOU"RE onto something.  Jim
> should check out all those jumpers with the mini-BNC's -- maybe one of 'em
> was swapped with that Skyhighgain cable Norman told us about.
>
> Seriously, tho' -- wasn't that another thing that could cause weird
> problems -- bad mini-coax?
>
> When the rational, logical, informed, incisive, deductive approach fails
...
> Well, let's consider ALL the clues ...
>
> Squeal -- loud disturbing noise, alarm, or (sl.) to give information, to
> "rat" on.
> Happens over 3 MC's, that could be written as >3.  Looks like a bird,
don't
> it?
> Motorboating, boats, water, ocean -- could be a seagull, or maybe
> "putt-putt" = golf
> Then there's the thing about cats.  Wait a minute!  A bird that looks like
a
> rat is a bat -- but then what's golf got to do with it?  This is going
> nowhere -- might mean something to a witch.  Is Les around?
>
> Forget all that -- pull the RF deck and check it out.  Could be an
> "underneath-ARGHHH-do-I-hafta?" problem.  Give it the close eyeball
> inspection.  By all means CLEAN the bandswitch -- twice. (unless I missed
> something and you did that already)
>
> Nobody seems to be focused on the >3 thing.  Why would this problem kick
in
> there?  What is different circuitry-wise about 0-1-2-3 vs 4+?  I guess one
> thing might be a rotor section or two on the bandswitch, no?  Maybe not.
> Any particular reason a bad cap would cause the squeal and motorboating to
> start at 4 MC's?
>
> Great, now I'm gonna be up all night 'cause of somebody else's radio.
>
> Barry
>
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