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

Dana Whitlow k8yumdoober at gmail.com
Fri Sep 14 15:55:01 EDT 2018


Frequency dividers can be pretty low noise, if you choose the right class
of logic.  I remember that
at one time in the distant past, LSTTL was considered king.  Unfortunately
I've been out of touch
with frequency dividers long enough to be ignorant of what works well today.

i'd suggest trying something with either HC-series or AC-series CMOS,
chances are fair that you'd
be happy.  Write me off list and I'll tell you which well-known distributor
still has an excellent
selection of HC and AC parts in stock.

Dana


On Fri, Sep 14, 2018 at 11:14 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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