[sdiy] AoE: X is coming soon!

[Magnus Danielson]

Hi Brian,

No cats, but I would imagine that they would like the heat from these
boxes. The maser is a little to big for being such a warm spot as a
rubidium or cesium.

However, some of the knowledge from audio field is very relevant. The
white noise and flicker noise in audio range is important in the
limitation these devices have. Wish I had a better audio noise
measurement setup in the home lab. Not that it has anything to do with cats.

Besides, every picknick needs a synthi!

Cheers,
Magnus

On 2020-01-24 21:48, rsdio at audiobanshee.com wrote:
> Hi Magnus,
>
> I only have a couple of follow-up questions:
>
> 1) Do you have any cats?
>
> 2) Do you have any photos of cats sitting on your hydrogen maser clock reference?
> (photos of cats sitting on rubidium and/or cesium clocks count, as well)
>
> Brian
>
> p.s. Just kidding. This might not be safe for cats.
>
>
> On Jan 24, 2020, at 4:51 AM, Magnus Danielson <magnus at rubidium.se> wrote:
>> 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
>>