Hello Karen,
I think you are confusing and/or mixing the terms "stability" and
"accuracy" with respect to your project.
It all depends upon your measurement period and the property being
measured. A GPSDO will never beat a truly, very high quality OCXO on a
short term basis in the stability
Thanks for the explanation. In this case you should buy both a cheap Rb and
good OCXO from eBay. This will allow you to explore the resolution of your
CNT-91 as well as make several pair-wise plots using TimeLab.
Remember that no one frequency reference will suite all occasions. Sometimes
the o
On Mon, Oct 27, 2014 at 9:10 AM, Ryan Stasel wrote:
> Chris,
>
> I’m curious how you have the PLL set up for the 5680 and GPS. Do you have
> any schematics, docs, etc?
>
I used a simplified version of the design posted by Lars Walenius.
Simplified in that I took out 90% of the software using onl
Karen,
a good double oven OCXO such as Morion etc will give you much better short
term stability than most Rudidiums can give you. By a factor of 10 or even
100 sometimes below 10s measurement interval.
The Rb's are better anywhere from 100s to many 1000 seconds.
bye,
Said
In a messag
Karen wrote:
> Really I am looking for a source with a good short range
stability performance between 1 and 10 seconds.
I concur with everything Tom wrote. If that is your goal, the best
you are likely to do is with a good, free-running (non-disciplined)
OCXO. That will have the best stabi
Many thanks for all your recommendations.
Let me provide more details for understanding of my task.
I am playing with a GPSDO project on base of uBlox NEO-7M
(http://www.ra3apw.ru/ublox-neo-7m-ocxo-gpsdo/) - sorry, text in Russian.
One of the main step – ADEV measurement of a developed GPSDO.
Hi Charles:
The SRS PRS-10 is based on their 10 MHz SC-10 oscillator. This is what I installed in the Gibbs rack box and made use
of it's the power supplies and added down counters to get a 1 PPS output.
http://www.thinksrs.com/products/SC10.htm
There are options for phase noise and aging and
> Really I am looking for a source with a good short range stability
> performance between 1 and 10 seconds.
If that is your goal, I'm not sure a cheap rubidium is necessary, or even a
good choice. Many plain OCXO have better phase noise and better stability over
tau 1 to 10 seconds.
Also for
John,
Thank you for the links (I visited few times before) and your recommendations.
Really I am looking for a source with a good short range stability performance
between 1 and 10 seconds.
I will prepare additional description of my task with more details shortly ...
Special Thanks for your Tim
Bert,
Thank you for the interesting GPSDO/FE5680A proposal. I will contact you off
list.
Karen, ra3apw
> Date: Sun, 26 Oct 2014 17:22:45 -0400
> From: ewkeh...@aol.com
>
> Karen
> To a large degree it depends on what you want to use it for. HP 5065 is
> considered top of the line and PRS 10 is
Chris,
I’m curious how you have the PLL set up for the 5680 and GPS. Do you have any
schematics, docs, etc?
I’m currently building a GPSDO based on James Miller’s design, and have a
separate box with a 5680 in it (also grabbed from eBay for $40, since it
“wouldn’t lock”, which was a simple fix
Rather than read the bandswitch, a very common ham radio solution is to
have the frequency counter read both the VFO and the crystal oscillator
frequency and do the math with the last IF offset as part of the equation.
At least one unit can also reads the BFO frequency.
Although the low end PIC o
On Mon, Oct 27, 2014 at 4:29 AM, Giuseppe Marullo
wrote:
> >The Teensy 3 can be programmed using the Arduino software. It's just a
> better Arduino, that's it.
> > But you say you have a PI. Why not use that? send your final RF to a
> zero crossing detector then to a counter in the PI.
> I expect
If you making a list of HP TIAs, don't forget the E1470A
-pete
On Sun, Oct 26, 2014 at 10:05 PM, Stewart Cobb
wrote:
> This list has a lot of discussion of HP 5370 time-interval counters,
> including the BeagleBone CPU upgrade. The usual sources seem to have HP
> 5371, 5372, and 5373 units avai
Hi
Based on reports on the earlier Z3xxx’s , I would be careful about the low end
of that supply range. There’s still way more range than you would ever need …
Bob
> On Oct 26, 2014, at 11:42 PM, Bob Stewart wrote:
>
> Hi Bob,
> The little brick says it's happy with 18-36V.
>
> Bob
>
>The Teensy 3 can be programmed using the Arduino software. It's just a
better Arduino, that's it.
> But you say you have a PI. Why not use that? send your final RF to a
zero crossing detector then to a counter in the PI.
I expect the PI does not have a counter, nor I would know how to set it
up
when comparing bottom sides of ref0 and ref1 boards IC U207 near antenna
input of ref1 seems to be missing.
Goetz
Original-Nachricht
Betreff: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A,
Z3811A, Z3812...
Datum: Sun, 26 Oct 2014 22:24:29 +
Von: Anthony
In message
, Stewart Cobb writes:
>Are they actually successor units? Are they upward-compatible with the
>5370? Are they more accurate, or less accurate? Is there anything that a
>5370 can do that the later units can't?
They are much more than the 5370, but the single shot resoluti
In message <6c69adeb-a4d8-4dee-a5d4-aec0fd164...@n1k.org>, Bob Camp writes:
>HI
>
>We seem to have drifted a bit.
>
>This started out as a supply for the Z3xxx Lucent GPSDO’s. [...]
Which, being telco material, is likely built to work exactly the way
I described: An unclean, unregulated
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