[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.
Regards
Paul
WB8TSL

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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