[R-390] Newbie needs help

[chacuff at cableone.net]

The broadcast band is unique in that it usually has very strong signal strengths compared to most of the SW bands.

 

With no additional information I would have to guess some kind of AGC problem.  I have to assume the RF gain control works properly in that when you turn it counter clockwise the signal strengths decrease, the signal metering comes up through mid scale...and when fully CCW no signals at all?  Does the Antenna Trim control seem to work properly peaking the signal?

How does it tune the calibrator on that band...and others.  Distorted also?

 

I have to believe a couple of other bands are also experiencing the problem but you may not have noticed because there is not much to listen to there...  I can’t remember off the top of my head the frequency range of the slugs/racks in that band on the RF deck.  Maybe a core is broken loose and no actually moving causing a mistuning of the front end and widening the front end band pass.

 

Reaching here with little to go on.

 



Cecil Acuff
Gulfport MS
K5DL


From: Mike Bracey
Sent: ‎October‎ ‎5‎, ‎2013 ‎12‎:‎05‎ ‎AM
To: R-390 mailman
Subject: [R-390] Newbie needs help


I need some direction from the gurus please. My 390a works fine in every respect except for distorted audio on the broadcast band. All other bands are fine. It is the same no matter what the settings on RF or AF gain. Bandwidth has no effect. All tubes check good. It's hooked up to a 40' inside long wire antenna. Could someone point me in the right direction?
 
Thanks,
 
Mike, KE5YTV
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