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

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

Yes it uses the Mini-Circuits VCO. The plans are available from the ARRL
download site. Here's the schematic.

http://www.geocities.com/hagtronics/r4_schematic.pdf


Pete KE9OA wrote:

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

Pete,

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

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

"Pete KE9OA" wrote:

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


Pete! Man, are your technically oriented writings a sight for sore
eyes! :-)

I'd like to ask a question, and though it's a bit of a threadjack...

Are you familiar with the OptoElectronics Scout series of frequency
counters? They are notorious for blowing their first amplifier. The
RF circuitry is all SMD, so I don't have any way of identifying the
part to replace it (hopefully with a more durable replacement).

Ever dealt with them? They aren't exactly lab grade... ;-)


ObOnTopic: Git that radio on the market, sir! I wanna buy one o'
them!

--
Eric F. Richards

"Nature abhors a vacuum tube." -- Myron Glass,
often attributed to J. R. Pierce, Bell Labs, c. 1940