An interferogram showing the nodes etc. of such a resonating quartz crystal
ring was posted by me in either February or March 2020.
Bruce
> On 01 April 2021 at 15:16 Bob kb8tq wrote:
>
>
> Hi
>
> Some of the early 100 KHz resonators were ring shaped. The British really
> pioneered
> this
Louis Essen was THE man - hence to the Essen Ring quartz oscillator which was a
development from Dye's original work on that particular quartz configuration.
The British PO used a bank of Essen Ring references as their standard
immediately prior to- and I think during most of- WW2. Not sure
Hi
Some of the early 100 KHz resonators were ring shaped. The British really
pioneered
this side of things ( while the US was still doing bars …) back in the 1930’s.
AFIK the
mode is not a whispering gallery.
Given the low frequency of a 100 KHz resonator, a “not space limited” design
might
I have not yet heard what GB wants to do, but if it's long range work
(return time of
10's of sec or longer), the problems related to T/R switching, Tn
degradation of the
receiver, etc, get a lot more tractable than one might suppose.
At Arecibo, the S-band radar was intended solely for long
During my days at UTC I was among other things responsible for our Industrial
Laser Group. We sold some 50 KW CW CO2 lasers! We had the only aero dynamic
window that allowed a vacuum on one side. When not in use you put a pencil
through it. Patented.
On 3/31/2021 11:02 AM, Bob kb8tq wrote:
Hi
If you were going insane on a fountain, you likely would go with one of the
sapphire whispering gallery devices as the start of your chain. A good one
will blow a quartz crystal based part away ….
Bob
When I left Keysight in 2014, they were
>If you were going insane on a fountain, you likely would go with one of the
>sapphire whispering gallery devices as the start of your chain. A good one
>will blow a quartz crystal based part away ….
That reminds me:
I think the first quartz-crystal at Bell Labs was ring-shaped, do you know if
On 3/31/2021 11:57 AM, Lux, Jim wrote:
In some ways it's like high power laser labs. It's not the direct beam
you worry about - nobody is going to put their hand in the beam path.
It's the stray reflection when something gets bumped and falls across
the optical bench and reflects a stray
On 3/31/21 11:33 AM, Wes wrote:
On 3/30/2021 4:33 PM, Lux, Jim wrote:
On 3/30/21 2:56 PM, Wes wrote:
You would know better than I, but I was thinking of physical size;
100m v. 70m.
Obviously a BIG difference in TX power.
Wes
It's all about EIRP, baby.
I know they're talking about half a
RX up here at Green Bank
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y
les...@veenstras.com
452 Stable Ln (HC84 RFD USPS Mail)
Keyser WV 26726
-Original Message-
From: Wes [mailto:w...@triconet.org]
Sent: Wednesday, March 31, 2021 2:34 PM
To: time-nuts@lists.febo.com
Subject:
On 3/30/2021 4:33 PM, Lux, Jim wrote:
On 3/30/21 2:56 PM, Wes wrote:
You would know better than I, but I was thinking of physical size; 100m v. 70m.
Obviously a BIG difference in TX power.
Wes
It's all about EIRP, baby.
I know they're talking about half a megawatt for GB, but I don't see
Hi
If you were going insane on a fountain, you likely would go with one of the
sapphire whispering gallery devices as the start of your chain. A good one
will blow a quartz crystal based part away ….
Past that, lower is better for crystals and “Time Nut” parameters. Q will be
higher
at lower
Somewhat related to the discussion about GPSDO's I have a basic question:
It used to be that 5MHz was the "hot spot" for crystals on the parameters we
care about as time-nuts.
Have advances in X-tal science changed that ?
To make it a concrete question:
If tasked with designing a Cs/Rb
Hi Chris.
Presuming you're interested in receiving QO100 with a LNB that doesn't drift
like crazy (in our terms at least.)
There are numerous pages on the intenet, that show how to modify some of the
common LNB's to take an external LO reference. There are also some
pre-modified on sale
Hi Chris --
The difference is that the ublox module is outputting a signal that's
being generated without much concern for its phase noise. The digital
process used creates a lot of jitter in the edges of the output
waveform. It simply wasn't intended for the TIMEPULSE output to be used
Hi
When you add noise to the local oscillator that down converts the signal,
that noise shows up on the output of the LNB. Depending on what you are
doing, this or that kind of noise can be a major or a not so major issue.
Indeed the uBlox output is more noisy than the Leo Bodnar device ….
Andy, I agree with you if that's the intended use. But unless I've missed
something, the
original inquirer has yet to state what he is trying to do, so the sky's
the limit.
Dana
On Wed, Mar 31, 2021 at 7:40 AM Andy Talbot wrote:
> More to do with amateurs using narrow band modulations, and
More to do with amateurs using narrow band modulations, and the LB GPSDO
being moderately good close in. Phase noise out beyond a few kHz goes
more or less unnoticed on SSB
Andy
www.g4jnt.com
On Wed, 31 Mar 2021 at 13:35, Dana Whitlow wrote:
> Chris,
>
> It may be that the modulation and
Chris,
It may be that the modulation and subsequent demodulation scheme used for
satellite TV and the
like is rather more robust than many people give it credit for.
Dana
On Wed, Mar 31, 2021 at 7:09 AM Chris Wilson wrote:
> Hello everyone
>
> Monday, March 29, 2021
>
> Thanks for the
Hello everyone
Monday, March 29, 2021
Thanks for the replies, some went a little over my head, which is not hard :)
I am wondering how people successfully use a Leo Bodnar programmable GPS source
to provide an external LO for an LNB as opposed to its internal xtal. What is
different, in
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