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

Adrian Godwin artgodwin at gmail.com
Sat Sep 15 06:15:54 EDT 2018


Depending on the cost of those mems devices, a microcontroller can be so
trivial that you can just consider it as a smart eprom. Like Tom's PICDIV
dividers, which act more like perfect-for-pupose division chip than a micro.



On Sat, Sep 15, 2018 at 4:31 AM, Forrest Christian (List Account) <
lists at packetflux.com> wrote:

> 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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