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

Bryan _ bpl521 at outlook.com
Fri Sep 14 17:42:05 EDT 2018


I would be interested in hearing more of the more suitable classes of logic chips. I have a 20Mhz rubidium that I wanted to divide down to 10Mhz

-=Bryan=-

________________________________
From: time-nuts <time-nuts-bounces at lists.febo.com> on behalf of Dana Whitlow <k8yumdoober at gmail.com>
Sent: September 14, 2018 12:55 PM
To: lstoskopf at cox.net; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Programmable clock for BFO use....noise

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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