[time-nuts] OT: xtal osc PN

[Stan, W1LE]

  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
>
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