[Collins] DDS again.

[cory]

First this:  "Is this for the 75S series. I have the 75S3 and would
li8ke to add more crystals."

This is for 75S-1 serial number 55.  One of the first modern
radios off the assembly line.  

A list member, Glen, sells an inboard crystal switch.  It's a mod
that adds another crystal bank under the lid.  

I'm still thinking about it. 

However, in addition to the AOR DDS-2A, there's a website in Italy
that shows a direct digital synthesizer hooked onto an S-Line.  It
replaces the crystal bank as does the DDS-2A.

The DDS-2A does the crystal bank and the PTO, and memories, and so
on. 

I also found a outfit, S&S Engineering, that makes the DVFO-II DDS
VFO.  They say that they can generate frequencies up to 50 mHz,
include an display with programmable offset, and can set the step
rate. 

I understand the issue of spurs but ignoring that for the moment, a
VFO that is crystal stable, steps 200 kHz (or 100 kHz) seems to be
a possible replacement for the crystal bank. 

Of course, if I wanted a general coverage receiver, why not just
buy one.  

I don't know the answer to that.   

de ah6gi/4  or just use the SX-100.