From: Garey Barrell 
Subject: Re: [drakelist] SPR-4 kits for FS-4?


Marty -

You will have to replace the 9.59 MHz reference crystal with 
a 9.6 MHz crystal in the FS-4.  The connector on the 
receiver end of the cable from the FS-4 is different, but I 
think it can be made to work as-is.  The reason for this is 
that while the R-4 Series uses crystals that are 11.1 MHz 
above the desired lower band edge, i.e., 21.1 MHz crystal 
for 10.0 - 10.5 MHz coverage, while the SPR-4 uses 11.09 
MHz, or 21.09 MHz crystal for 10.0 - 10.5 MHz coverage.

I don't have the crystal specs, you may be able to get them 
from Drake or possibly from International Crystal.

Or if you can live with the dial reading 10 kHz off .....

73, Garey - K4OAH
Atlanta

Allen (Marty) Martin wrote:

> I recently acquired a FS-4 that is setup to use with the SPR-4. Apparently
> Drake had a kit to do this. Does anyone know what was in the kit? Also I
> would like to reverse the change so as to use the FS-4 with a C-line.
> 
> Thanks
> Marty
> 

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