Nigel,

Not sure if maybe anyone has answered you yet, but the drill of pulling and
reseating the plug-in boards, along with optionally cleaning and DeOxit-ing the
Molex pins, often cures wierd 7-Line problems.

73

-Jim


On Wed, 21 Jul 2010 19:49:32 +0000, Nigel Gunn G8IFF/W8IFF wrote:

>I've got a wierd.
>
>With radio set to LSB and filter A I get a whistle of around 2KHz which 
>disappears if I reduce the RF gain control to 
>below around half way. The PBT control will drop it off either side of the 
>filter.
>No other control combinations affect it.


--
Ham Radio NU0C
Lincoln, Nebraska, U.S.S.A.
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, 
HyGain 3750, IBM PS/2 - all vintage, all the time!

"Give a man a URL, and he will learn for an hour; teach him to Google, and he 
will learn for a lifetime."

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