[Premium-Rx] Looking for USB filter for Racal 6790/GM

[Carcia, Frank A. HS]

Hi Ron,
I had the same problem with a CW filter. I took it apart and found a loose
mounting screw that floated the circuit board ground. I jumped all the
grounds on the board and put it back in the case. Gary Wingerd drills out
the stamped dimples on the case if they have them. The internal board is
mounted with 4 screws. The internal board requires
more than 1 screw to make ground. Gary can repair it for you if you don't
want to try.
fc  

-----Original Message-----
From: Ron Ott [mailto:ronott at sbcglobal.net]
Sent: Sunday, January 05, 2003 12:18 AM
To: Premium Receiver Group
Subject: [Premium-Rx] Looking for USB filter for Racal 6790/GM


I'm on my second forey for a crystal USB filter for my Racal 6790/GM. 
 As a result of the first hunt, I bought one LSB and two USB filters, 
but both USB filters have problems.  

In one, there is a 20 db notch in the audio passband about 1 kHz from 
the edge.  I haven't looked at the second filter with an audio spectrum 
analyzer, but it sounded funny also. Is there any strangeness  with the 
Racal auto setup that would give this result? I checked and the BFO 
frequency is spot on (455 kHz, as I recall) and the filter passband is 
right on, except for the funny notch, which is a few hundred Hz wide. 
It's odd, but I suspect a bad crystal in the filter.  The second USB 
filter has been opened and resoldered.

So, if you'd like to part with a good USB filter for the Racal, please 
let me know privately by e-mail. I would consider a USB/LSB filter pair 
if you won't sell the USB separately.

Thanks!!
Ron
W6XY


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