Hello Frank,
Down East Microwave (DEMI) in Florida will be coming out with a
stabilized VHF LO module soon.
Should be a single board for 6M, 2M, 222, 432 MHz and possibly beacon duty.
Was designed by N5AC. 10 MHz external reference.
Hope fully a single programmed board can be jumpered for the fixed LO as
needed.
How soon is anyone's guess. Contact them. It is a very active project.
This board may satisfy most every VHF Nut's discerning needs.
The real question is what should be the LO phase noise threshold
for effective VHF/UHF ham radio comms work.
If the real goal is xtal low phase noise and you can live with the freq
stability,
than use an external stabilized source as a local beacon, to verify
frequency accuracy.
Stan, W1LE Cape Cod FN41sr
Ok, let's say as good as practically and economically feasible for
"single" prototype and homebuilder. I already chosed not to use a
Si570 because I really need only few (2-4) fixed frequencies and I'm
assuming that carefully made xtal oscillators can beat the Si570 phase
noise performance.
The conversion is obviously for a receiver, not for the classic HF
bands, but for the lower VHF amateur bands (50-70 MHz) where IMD3
performance of the receiver has to be the best possible, as these
bands are used for TV and radio broadcasts in many nearby countries
around here.
Of course a very good frontend BPF, amplifier and mixer are needed,
but these are less of a problem for me to chose (and are simpler to
evaluate with "standard" test equipment too).
Unfortunately I know very few low-VHF-nuts and very few of them (if
any) realize their setup performance are so far distant from what can
be achieved nowadays.
Thanks again
Frank IZ8DWF
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
