On Sun, 1 Mar 2020 07:39:43 -0800
jimlux wrote:
> How does a CSO compare with a Mercury Ion clock - the latter does fit in
> a satellite and is intended to replace the USO kind of function.
They use/used CSO's as local oscillators for the Hg ion clock.
Their first papers ([1] and [2]) used to u
Hello Jim
>How does a CSO compare with a Mercury Ion clock - the latter does fit in
>a satellite and is intended to replace the USO kind of function.
The current CSOs can be surprisingly compact. I was visiting a university
colleague who had recently bought one from Cryoclock for use in quantum
On 2/29/20 2:47 PM, Attila Kinali wrote:
On Sat, 29 Feb 2020 17:01:27 -0500
Bob kb8tq wrote:
Isn't that where "whispering gallery" modes come into the picture ?
…… and done with sapphire.
This is the real answer to “why is nobody going to do this?”. You already
have something ( the sapphire
In message <92c74f8b-f351-4a6c-916f-ec68cfd35...@n1k.org>, Bob kb8tq writes:
>> Why would it be so expensive ?
>
>You would have to do a *lot* of things from scratch. First up, there is
>no 'modern' cold weld package big enough to put the beast into. You would
>have to tool that right up
On Sat, 29 Feb 2020 17:01:27 -0500
Bob kb8tq wrote:
> > Isn't that where "whispering gallery" modes come into the picture ?
>
> …… and done with sapphire.
>
> This is the real answer to “why is nobody going to do this?”. You already
> have something ( the sapphire resonators ) that does better
Hi
> On Feb 29, 2020, at 3:23 PM, Poul-Henning Kamp wrote:
>
>
> In message <20200229210755.1abd900696f8aa85567d2...@kinali.ch>, Attila Kinali
> writes:
>> On Sat, 29 Feb 2020 13:44:59 -0500
>
>> But, there is not much we can do about absorption/desorption.
>
> Actually, there are th
Hi
> On Feb 29, 2020, at 3:07 PM, Attila Kinali wrote:
>
> On Sat, 29 Feb 2020 13:44:59 -0500
> Bob kb8tq wrote:
>
>> One wonders what the result would be of doing a large blank (> 50mm)
>> 2.5 MHz 5th OT using modern design, packaging and mounting techniques.
>
> If we use the venerable Sul
In message <20200229210755.1abd900696f8aa85567d2...@kinali.ch>, Attila Kinali
writes:
>On Sat, 29 Feb 2020 13:44:59 -0500
>But, there is not much we can do about absorption/desorption.
Actually, there are things you can do, but they are very
expensive.
One of the early paths of experim
On Sat, 29 Feb 2020 13:44:59 -0500
Bob kb8tq wrote:
> One wonders what the result would be of doing a large blank (> 50mm)
> 2.5 MHz 5th OT using modern design, packaging and mounting techniques.
If we use the venerable Sulzer as guide (see e.g. [1]) and going
by what the FE-405 achieves, I wo
Hi
> On Feb 29, 2020, at 2:44 PM, Poul-Henning Kamp wrote:
>
>
> In message <2e09a559-b476-45c0-a476-7d5808a93...@n1k.org>, Bob kb8tq writes:
>
>> One wonders what the result would be of doing a large blank (> 50mm) 2.5 MHz
>> 5th OT using modern
>> design, packaging and mounting tec
In message <2e09a559-b476-45c0-a476-7d5808a93...@n1k.org>, Bob kb8tq writes:
>One wonders what the result would be of doing a large blank (> 50mm) 2.5 MHz
>5th OT using modern
>design, packaging and mounting techniques. Given that it would take a rather
>large pile of nickels to
>find
Hi
More than the cut, the packaging, resonator design, mount design, and
processing of the crystal
(in no particular order ) are what really make this or that crystal suitable
for use in a precision OCXO.
You can indeed find AT cut OCXO’s that do pretty well once they warm up ….
One wonders w
Since the poor old SC cut crystal has been given such a kicking for its
inconvenient placement of spurious responses, is there a better, or BEST
crystal for putting in an oven and turning into a nice reference?
John
Cheers - John
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