[sdiy] AoE: X is coming soon!

[Magnus Danielson]

Hi Achim,

On 2020-01-23 21:38, ASSI wrote:
> On Thursday, January 23, 2020 12:48:07 AM CET Magnus Danielson wrote:
>> Mine arrived today.
>>
>> More of the same good stuff that is in the rest of the book. It carves
>> on more of the reality, ways to make good amplifiers, ways that
>> disturbances can be made, and then healed. More of the life chores and
>> ways to deal with them. I look forward to read more in depth.
> No mention of hydrogen masers?

No, in general, the part about oscillator noise and stability is leaving
a bit to be desired, like about everything.

For those that do not get the joke, I recently too deliver of an surface
mounted oscillator, at 250 kg is becomes fairly well mounted on the
surface it stands on. It has really good phase-noise, and at observation
time 1000 s it is down to 3E-15 in Allan deviation, which is the
frequency stability as used by the big guys. I had one of the NPL
scientists be in total denial for the fact that I have a hydrogen maser
at home, at first he said I didn't have one, but he had to ask multiple
times after showing me their primary reference cesium fountain if I
really have a hydrogen maser.. at home. Sure I do. With a few rubidiums,
cesiums and so.

The 1,420405751 GHz clock is tweakable to within a fraction of a Hz...
end-to-end of the scale.

Some 20 years ago I wanted to improve my ability to measure analog synth
oscillators tracking. Let's just say it got somewhat out of hand. At
least I know much more about how to measure oscillators and characterize
them. I am now part of the IEEE standardization work on the topic, at
the request of NIST.

Cheers,
Magnus