[TMC] TMC GPR 90 RXD signal overload

[WA5CAB at cs.com]

Larry,

I don't have a manual on the GPR-90RXD but do have IN-3005S on GPR-90RXDS.  
The schematic shows R-106, 500 ohm, as the screwdriver adjust IF gain pot.  
Since I don't have the RXD manual I don't know what the differences are or what 
the "S" refers to.  But perhaps you have an RXDS.  

WRT adjusting the pot, the manual says to set certain controls, adjust the 
signal generator to 50 microvolts output, and "using R-106 and R-50 (the S-Meter 
pot) set the S-Meter to S-9".  That doesn't totally make sense as there would 
be several possible setting I would think that would result in an S-9 
reading.  I couldn't find any other mention of R-106 but could have missed it.

Reprint of the manual with four foldouts (2 @ 11x17 and 2 @ 11x30) is $20 
plus shipping.  I'm sure that if someone has it on their web site for free 
download, they'll mention it.  

In a message dated 7/16/2008 12:42:00 PM Central Daylight Time, dobby at aei.ca 
writes: 
> I am Larry in Montreal, recently acquired a GPR 90RXD. It is very easily
> overloaded especially
> on the BC band. Any suggestions.    Secondly, my model has an IF gain pot on
> the rear but this is not shown in the manual and thereore no method for
> optimal setting like in the Cliins R 390A.
> Any documentation out there on this adjustment?  I thank you in advance for
> any assistance you may be able to offer.
> 

Robert Downs - Houston
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