Isn't that the one that uses the Mini-Circuits VCO? I believe that there was
an article about that unit a couple of years ago. Nice unit.

Pete

"HFguy" wrote in message
news:LTY2g.2501$Qe.606@trndny09...
Pete KE9OA wrote:
I think that you can order the crystals from such companies as
International Crystal, but the synthesizer will provide a good solution.
I am thinking of using the DDS as the reference portion of a hybrid
design, using a PLL to clean up the artifacts from the DDS output.
Essentially, the DDS will tune in 500kHz steps, with an I.F. offset that
can be user programmed for the R4 and the SPR-4.
I am tossing back and forth between using an LCD or a 3 digit LED
readout.

Pete,

Do you know about this (below) homebrew FS4 design?

http://www.geocities.com/hagtronics/r4.html