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

wrote in message
ups.com...

Pete KE9OA wrote:
Funny you should ask............................I am working on a new
iteration for the MW receiver. The 2nd I.F. subsystem will be using an
NJM2552 AM/FM chip. Using this device, I will be able to take the limited
I.F. signal out of the FM section and send it straight to the Sync
detector.
I am waiting for samples on this device.
SI has put the project on the back burner for the time
being...........they
still have to get the control code together for the display.
The Drake '4-line synthesizer has a bug in the control
code........incrementing up in frequency is fine, but when you tune down
the
rules sometimes go out the window. I have tested the prototype on my
SPR-4,
and it does work very well.

Pete

wrote in message
ups.com...
Maybe I've missed something, but it seems to have been a while since I
last read anything on Pete G.'s MW receiver. The website for Silicon
Engines says nothing about it and I am wondering if the project ended
up going to another company along with him.

BTW, if Pete's reading this, have you done anything with your design
for a frequency synthesizer for the Drake R4 line?


Thanks for responding, Pete! I am glad to hear that your receiver
project is still going ahead, and I'm looking forward to it coming on
the market.
I'm also glad that I learned of your interest in the Drake frequency
synthesizer, as I've just aquired an R4B and don't know how difficult
it is yet to find SWL band crystals.