[R-390] Intermittent

[Roy Morgan]

On Nov 13, 2009, at 9:45 PM, Gary Harmon wrote:

> My R-390 has intermittent signals.
>
> Sometimes broadcast will come on in about a minute and then operate  
> for
> hours before the signal drops out.  It may come back or it may not.   
> When it
> drops out or comes on it does it slowly like something turning on or  
> off.
> When the signal drops out, audio hiss remains.

Gary,

The RF deck has test points that let you inject signals (from a  
generator, or just from a wire or antenna) at a  number of points  
along the way. If you dope out the signal path and frequencies, you  
can figure out what stage is quitting.

I think that in the manual there is a table of signal levels  
(approximate) that are at each stage.  The test points are tip jacks  
and accept the tip of a test probe or something similar.

Roy

Roy Morgan
k1lky at earthlink.net
529 Cobb St.
Groton NY, 13073
Home: 607-898-3607
Cell: 301-928-7794