[R-390] R-390A problems

[Roy Morgan]

At 04:36 PM 8/8/2002 -0700, you wrote:
>1. The AC power cord has been replaced by a three wire with the green wire 
>connected to the chassis. Bad line filter?


No no no.. Just normal operation of your GFI.  The line filter caps in the 
radio are NOT leaking are NOT shorted and are working just fine.  They are 
simply high enough in capacitance to pass enough ac from line (hot) to 
chassis to trip the GFI.  Simple fix: use an isolation transfomr or get rid 
of the GFI..  DO NOT  get rid of the safety ground on the three wire cord.

>2. The cosmos PTO dies when tuned above about 2.3MHz. Changed tubes 
>several times but that is not the problem.

Othe guys will have answers to this.

>
>3. The audio module is dead. Don't expect to have much trouble with this 
>and I do have a spare around here someplace.
>I may have some kind of depot dog on my hands?


Not likely..you just have the good fortune to be able to learn more about 
your radio as you fix it.

(CHeck that there is no jumper on the "BREAK-IN" rear terminals and the 
break in front panel switch ON.)

Roy



Roy Morgan
K1LKY since 1959
7130 Panorama Drive, Derwood MD 20855
301-330-8828 home .... 301-975-3254 work
roy.morgan@nist.gov