Hi
A “modern” 5 MHz 5th overtone AT cut resonator *should* be able to
hit a Q of 5 million. Indeed one has to do everything right to hit that
number. More or less it is the design that “defines” the Q of a bar of
quartz. (Yes, there’s more to it …..).
Since that part uses a blank that is
Bob somewhere buried in my collection of interesting bits I have a rather
battered demo sample of what the British GPO Research crystal labs refered
to as an Essen Ring. It is indeed around 3 inches in outer diameter and
almost an inch thick and wide. this would have been cut from natural
On Mon, 2021-04-05 at 22:30 +0200, Attila Kinali wrote:
> On Sat, 03 Apr 2021 08:36:28 -0700
> Shawn wrote:
>
> > Tried putting an LM317 regulator in the line to drop the 30V supply
> > to
> > 10-12V and the power dissapation is beyond the heatsinking I have
> > that'll fit, also seems wasteful.
Hi
Back it the “old days” ( so 1960’s in this case ) glass packages
were very commonly used for precision crystals. They were available
in large diameters ( think of transmitting sized vacuum tubes). This allowed
use of larger diameter blanks than what fit in today’s much smaller packages.
On Thu, 01 Apr 2021 11:06:43 -0500
Chris Caudle <6807.ch...@pop.powweb.com> wrote:
> What kind of oven temperature range? I thought sapphire oscillator was
> pretty much synonymous with "cryogenic sapphire oscillator." I found a
> paper which described sapphire as a "low loss material with
On Mon, 5 Apr 2021 19:04:01 +0200
Hendrik wrote:
> I just realized a friend published her thesis on phase-noise measurement
> on her blog (in german):
>
> http://www.stefanie-engelhard.de/sites/default/files/2019-03/Diplomarbeit_Stefanie_Engelhard_0.pdf
I recently stumbled over this thesis and
On Sat, 03 Apr 2021 08:36:28 -0700
Shawn wrote:
> Tried putting an LM317 regulator in the line to drop the 30V supply to
> 10-12V and the power dissapation is beyond the heatsinking I have
> that'll fit, also seems wasteful. I have a switcher thatll fit the
> bill but amd concerned about the
On Wed, 31 Mar 2021 16:44:40 +
"Poul-Henning Kamp" wrote:
> It used to be that 5MHz was the "hot spot" for crystals on the
> parameters we care about as time-nuts.
Depends on what kind of time-nut you are ;-)
If you are going for high frequencies beyond 1GHz, then a mesa
type high
On Tue, 30 Mar 2021 08:15:30 +
"Poul-Henning Kamp" wrote:
> In one of his lectures Feynmann mentions that the energy levels of
> hydrogen have been calculated to 15 or 16 digits "from first
> principles".
>
> As far as I can figure out, that must have happened in the 1970'ies,
> which means
Hoi Demetrios,
Sorry for the late answer, last week was a bit crazy.
On Sat, 27 Mar 2021 09:58:30 -0400
Demetrios Matsakis via time-nuts wrote:
> I’ve attached an old paper of mine, from PTTI-2000.
Thanks! I hadn't seen this paper yet.
> I’ve also attached the latest BIPM file of TT. If
On Fri, 26 Mar 2021 14:42:25 -0700
wrote:
> "It would be cool to say one has a "primary standard", So, I think
> we should be careful with the term, it's get thrown around too lightly."
>
> Any of the hobby grade used Cesium standards is actually a Primary
> frequency standard as it does
Hello all,
I just realized a friend published her thesis on phase-noise measurement
on her blog (in german):
http://www.stefanie-engelhard.de/sites/default/files/2019-03/Diplomarbeit_Stefanie_Engelhard_0.pdf
Best regards,
Hendrik
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