[time-nuts] Re: E1938A phase noise improvement

[Stewart Cobb]

Rick,

I think this was the comment I was referring to:

https://lists.febo.com/empathy/thread/SAGAOXBTK47QABBXZIUWFZ65TS76QZTA?hash=F5ONUQ552CLJ4G67XSYGV7JYBIOHMSPA#F5ONUQ552CLJ4G67XSYGV7JYBIOHMSPA

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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