[time-nuts] Re: E1938A phase noise improvement

[Tom Van Baak]

The correct link is:

https://febo.com/pipermail/time-nuts_lists.febo.com/2012-September/053009.html

/tvb


On 12/26/2021 10:07 AM, Stewart Cobb wrote:
> Rick,
>
> I think this was the comment I was referring to:
>
> https://lists.febo.com/empathy/thread/
>
> Which says:
>
> "... the phase noise is not as good as a
> 10811 due to broadband noise in the automatic frequency
> control circuit.  By the time I discovered this, it
> was too late to try to fix it."
>
> And after nine years I obviously somewhat mis- remembered it. But I still
> wonder whether you had any ideas to improve it.
>
> Cheers!
> --Stu
>
> On Sat, Dec 25, 2021, 22:56 Richard (Rick) Karlquist <richard at karlquist.com>
> wrote:
>
>> I'm sure I said that ... a long time ago.  I can't remember now what the
>> fix was, but I am fairly sure it would only apply to phase noise at
>> more than 1 kHz offset.  If anyone can jog my memory about it I might
>> be able to remember the details.
>>
>> Rick N6RK
>>
>> On 12/25/2021 2:09 PM, Stewart Cobb wrote:
>>> Rick Karlquist mentioned some time ago that the phase noise of the E1938A
>>> could have been improved by a simple change, but the production managers
>>> were unwilling to apply that change because there was no customer demand
>>> for it.
>>>
>>> What was that change, and is it feasible for a skilled hobbyist to make
>>> that change on an individual existing unit or two?
>>>
>>> Cheers!
>>> --Stu
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