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

paul swed paulswedb at gmail.com
Fri Sep 14 17:32:36 EDT 2018

As a suggestion I collaborate with a Canadian ham some 5 years ago using a
DDS as a BFO for the HP 3586. Those details were shared on time-nuts if
they are still in the archives.That worked really well. I recall he was a
VE3??? The 3586 had 2 crystals for the BFO while the entire rest of the
system was locked to a single reference. Adding the DDS really reduced the
BFO behaviors that we typical hams wouldn't really notice. It also sound
very clean.

On Fri, Sep 14, 2018 at 4:26 PM, Richard (Rick) Karlquist <
richard at karlquist.com> wrote:

> The AC series is really quite good on phase noise; I used it in
> the 5071A at 80 MHz.
> Rick N6RK
> On 9/14/2018 12:55 PM, Dana Whitlow wrote:
>> 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,
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