[time-nuts] Programmable clock for BFO use....noise

Forrest Christian (List Account) lists at packetflux.com
Fri Sep 14 23:31:34 EDT 2018


Would a mems oscillator such as a dsc6183 possibly work for you?  I'm
uncertain if the characteristics of a mems oscillator is compatible with
your application.

For odd frequencies I often head toward a mems oscillator since many can be
programmed to any reasonable frequency.   For example one can buy dsc6183
blanks and use a programmer to program it to your desired frequency.

The dsc61xx series happens to be one time programmable so you only get one
shot at it per blank.  The programmer is relatively inexpensive, but might
be more than one would want to pay for a one off.  I have found that having
a collection of blanks and a programmer is very useful since it allows me
to generate any frequency oscillator I need.

There are other mems oscillator models out there, with various specs and
programming (or not) options.






On Fri, Sep 14, 2018, 11:16 AM <lstoskopf at cox.net> wrote:

> Off topic for this list, but you guys are experts in oscillator noise!
>
> Playing with some mechanical filters.  Need USB and LSB crystals for the
> BFO.  No one seems to make crystals anymore, especially in the 253 KHz
> range!
>
> Looking at the DigiKey Cardinal programmable oscillators.  Cheap and
> available: CPPC1LZ A5B6
>
> Anyone have an idea how noisy these would be after a division by 4 to get
> them in range?
>
> Thanks,
>
> N0UU
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