[TMC] GPR-90-RXDS Manual Reprint Available

Sat, 10 Apr 2004 23:30:56 EDT

Mahlon & Group,

In comparing the GPR-90 (which I've concluded is the same as the GPR-90-R) 
and the GPR-90-RX, I see no differences other than the addition of the crystal 
oscillator and 10-position crystal bank for the HFO.  IF output is from the 
plate of the 3rd IF.  1st RF is 6AB4.  2nd RF is 6CB6.  BFO is 6AG5.  2nd (3rd 
actually) Detector/NL is 6AL5.

I don't have the GPR-90-RXD manual.

The GPR-90-RXDS, besides what you've mentioned, has a 12AT7 2nd Det/IF Out 
Buffer.  The NL is a pair of 1N463's.  BFO is 6BE6.  It has the diode load and 
AVC bought out to the rear for diversity connections.  The AVC time constant 
changes to slow when the BFO is turned on.  It has both Hi-Z and Lo-Z IF 
outputs, and has provision for external input of the HFO, IFO and BFO.  I've probably 
missed something else, but you have a GPR-90-RXD.  Maybe you can find 
something on that list that isn't that way in the -RXD.

In a message dated 4/10/2004 8:27:04 PM Central Daylight Time, 
[email protected] writes: 
> Robert's reprint of this manual was basically at my instigation because 
> we figured out that he has a manual that covers my particular GPR-90RXD, 
> which uses a 6DC6 as the first RF amp and a 6BA6 as the 2nd RF amp.
> 
> Robert and I are still in a quandary as to the difference between the 
> "S" and non-"S" versions of this receiver.   Can anyone shed some light 
> on this?
> 
> For that matter, I'm still not clear on what makes the "D" (diversity) 
> version a "D".  Can anyone shed light on that?
> 
> regards,
> 
> Mahlon - K4OQ

Robert & Susan Downs - Houston
<http://www.wa5cab.com> (Web Store)
<[email protected]> (Primary email)
<[email protected]> (Backup email)

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