Charles,
> I have a machine-translated PDF (~2.5MB), but nowhere to put it
> up. If you have web space for it, please feel free to do so
> (assuming that Karen does not object).
I am OK with it if it might be interesting to someone...
Karen
> Date: Mon, 03 Nov 2014 15:43:47 -0500
> From: Charl
Hi Tom,
Thank you for the comments. The results are better than my expectation.
Please find the new result with two Morion's OCXO: the first is an external
reference for CNT-91 and second - DUT.
https://dl.dropboxusercontent.com/u/21338179/hamradio/OCXO_Adev/morion%20ocxo%20vs%20morion%20referen
Hi,
yes, it is my fault - my set up (connections) for TI mode was not correct.
According your advices I went back to the frequency mode and set gate / sample
time to 1 second for CNT-91 and TimeLab.
Then I switched on "Smart Frequency" and "Interpolator Calibration" option on
CNT-91
Charles, John and Bob,
Many thanks for your advices.
1) Charles Steinmetz wrote: "I would suggest trying a few of the oscillators
again (no need to try them all), using the Isotemp OCXO as the time base for
the Pendulum by connecting it to the Pendulum's REF input and selecting
External Refere
Thank you, Charles.
All OCXOs have been tested in free-running mode after 40-50 min of
switch-on/warming.
All OCXOs have been installed in isolated close box to exclude external
airflow.
Cases of all OCXOs had not any contact with external metallic parts of the
box.
Karen
>Karen wrote:
>
Thanks All for your comments and clarifications.
The next OCXOs have been tested today:
* Morion MV89A 10.000MHz #1
* Morion MV89A 10.000MHz #2
* Morion MV89A 10.000MHz #3
* Isotemp 131-191 10.000MHz #1
* Pilot C3Z 10.000MHz
* Bliley NV26R891 100
Alex,
Thank you for the advice.
I have a colleague in Moscow who has a big experience with MV89A repair.
73 de Karen, ra3apw
> Date: Wed, 29 Oct 2014 14:57:17 -0700
> From: Alexander Pummer
>
> Don't give up Karen, the Morion oxcos are relative easy to repair, you need
> one coca-cola can, cut
John,
Thank you, done.
I saved all .TIM files for each OCXO to have an opportunity to compare all
variants off line.
I will publish the results shortly.
Karen
> Date: Wed, 29 Oct 2014 13:43:51 -0700
> From: "John Miles"
>
> Don't forget to hit 'f' and/or 'p' to check the frequency and phase t
Charles,
Thanks a lot for the detailed explanation and recipes. Understood and will
check this weekend.
All my Morion 10MHz MV89A OCXOs are used and from eBay's. That's why the first
version of broken surplus MV89A looks realistic.
Best regards,
Karen
> Date: Wed, 29 Oct 2014 10:02:44 -0400
> F
Thanks again for your explanations and advices.
I raised this question as a ADEV measurement result of my GPSDO/NEO-7M is about
1E-9 for tau = 1sec
http://www.ra3apw.ru/wp-content/uploads/2014/10/NEO7M_OCXO_MV89A_10M_2h0_ADEV.jpg
and it isn't meet my expectation.
In my understanding (before I p
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.
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
I hope to use homemade GPSDO for the rubidium oscillator calibration.
Karen, ra3apw
> Date: Sun, 26 Oct 2014 12:01:28 -0700
> From: Chris Albertson
>
> I know what your next question will be, "I see that these rubidium
> oscillators all can be adjusted over a range that falls on both sides of
>
Said,
Thank you for the advice.
Can I have the arguments for this decision taking into account that the cost of
PRS-10 is much higher than other mentioned rubidium sources .
Karen, ra3apw
>Date: Sun, 26 Oct 2014 11:13:06 -0700
>From: Said Jackson
>
>Karen,
>
>PRS-10..
>
>Sent From iPhone
--
Hello All,
Can I have your recommendation regarding a choice of 10 MHz rubidium source
(available now on eBay like FE-5680; LPRO-101; LPFRS; FRS etc.) as a
reference signal for my frequency counter Pendulum CNT-91.
Thanks in advance.
Karen, ra3apw
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