Stanley Reynolds wrote:
>
> Bruce
> Some references I found.
> http://findarticles.com/p/articles/mi_m0HPJ/is_n1_v40/ai_7113244/pg_5
>
Good article, but the HP5371 only has 200ps resolution this is inadequate.
> http://iram.cs.berkeley.edu/serialio/cs254/interpolator/interp.html
>
Somewhat i
Stanley Reynolds wrote:
> Bruce
> This counter may be close : http://www.psplc.com/datasheets/vigo/VOITC-200.pdf
> or http://ztc.wel.wat.edu.pl/kalisz/T-2300R.pdf
> Stanley
>
>
>
Stanley
Much better but still inadequate for characterising good oscillators, at
least for short averaging times.
I have what appears to be the same module pictured for the group buy but
from another US source who was selling on the Agilent group. The Trimble
data sheet he provided said it is Trimble PN 41562-30 and requires +12, -7
and +5Vdc. He had -7 to -8 hand written aroumd the the printed -7. The
group
- Original Message
From: Bruce Griffiths <[EMAIL PROTECTED]>
To: Discussion of precise time and frequency measurement
Sent: Thursday, May 22, 2008 10:01:27 PM
Subject: Re: [time-nuts] Comparing Reference Accuracy
Stanley Reynolds wrote:
> Stanley Reynolds wrote:
>
>> Disabling all th
- Original Message
From: Bruce Griffiths <[EMAIL PROTECTED]>
To: Discussion of precise time and frequency measurement
Sent: Thursday, May 22, 2008 10:01:27 PM
Subject: Re: [time-nuts] Comparing Reference Accuracy
Stanley Reynolds wrote:
> Stanley Reynolds wrote:
>
>> Disabling all th
I bought a couple of HP 59307A switches on eBay for $5 each plus reasonable
shipping.
They can be found regularly.
I was offered an HP 5334B for parts that was missing the cover and front
panel (including display and switches, resulting from an emergency landing
with the gear up, or something l
Stanley Reynolds wrote:
> Stanley Reynolds wrote:
>
>> Disabling all the GPS receivers at the same time would allow a comparison of
>> the hold over of each. As we are also logging the temp and power some
>> changes in these would also help determine how "good" each DO is as far as
>> stabili
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Stanley Reynolds
> Sent: Thursday, May 22, 2008 9:37 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Comparing Reference Accuracy
>
>
>
> I have several HP
- Original Message
From: Bruce Griffiths <[EMAIL PROTECTED]>
To: Discussion of precise time and frequency measurement
Sent: Thursday, May 22, 2008 5:33:40 PM
Subject: Re: [time-nuts] Comparing Reference Accuracy
Stanley Reynolds wrote:
> Disabling all the GPS receivers at the same time
The monitor test points will not help you, except to let you know its
operating correctly.
I had an FRK-L that the lamp failed. I ran fine for 12 years (and it
had more years on it, bought surplus). It was working fine and one day,
I noticed it was not locked. I kept monthly logs and the dat
I started doing that some time ago using my Wiki, but got distracted. Anyone
can contribute, you are certainly welcome to:
http://www.ko4bb.com/cgi-bin/wiki/wiki.cgi
Didier KO4BB
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Robert Atkinson
> S
Stanley Reynolds wrote:
> Bruce
>
>
> Getting back to the idea that the DO controller needs to measure the
> oscillator to make corrections, would your suggestions make a better DO
> controller if used in this measurement ? Or maybe instead of just measuring
> the difference between a group o
I picked up an EFRATOM FRK over on the "dark side" and was wondering if there
is any way to determine or estimate the life remaining on it.
Thanks, Dick, W1KSZ
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- Original Message
From: Bruce Griffiths <[EMAIL PROTECTED]>
To: Discussion of precise time and frequency measurement
Sent: Thursday, May 22, 2008 5:09:32 PM
Subject: Re: [time-nuts] Comparing Reference Accuracy
Stanley Reynolds wrote:
> The prams for sample size could also be set in t
Stanley Reynolds wrote:
> Disabling all the GPS receivers at the same time would allow a comparison of
> the hold over of each. As we are also logging the temp and power some changes
> in these would also help determine how "good" each DO is as far as stability.
> Stanley
>
>
You still need a
Disabling all the GPS receivers at the same time would allow a comparison of
the hold over of each. As we are also logging the temp and power some changes
in these would also help determine how "good" each DO is as far as stability.
Stanley
__
Stanley Reynolds wrote:
> The prams for sample size could also be set in the sampling PICs you would
> probably want to set them all the same.
>
A much better scheme is to time stamp the leading edges of the various
PPS signals (from the GPS receiver and the divided down output of each
GPSDO
Stanley Reynolds wrote:
> Stanley Reynolds wrote:
>
>> Block diagram of using a modified version of the DO controllers to compare
>> several disciplined oscillators. The single logging PC could be several PCs
>> as a way to have enough serial ports.
>> http://i307.photobucket.com/albums/nn30
The prams for sample size could also be set in the sampling PICs you would
probably want to set them all the same.
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- Original Message
From: Bruce Griffiths <[EMAIL PROTECTED]>
To: Discussion of precise time and frequency measurement
Sent: Thursday, May 22, 2008 4:26:43 PM
Subject: Re: [time-nuts] Comparing Reference Accuracy
Stanley Reynolds wrote:
> Block diagram of using a modified version of the
Stanley Reynolds wrote:
> Reduced VE2ZAZ controller to be used as a counter.
>
> http://i307.photobucket.com/albums/nn306/stanleyreynolds/VE2ZAZreduced.jpg
>
>
Resolution is still inadequate for meaningful comparisons with short
averaging times.
For longer averaging times all GPSDOs will
Reduced VE2ZAZ controller to be used as a counter.
http://i307.photobucket.com/albums/nn306/stanleyreynolds/VE2ZAZreduced.jpg
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Stanley Reynolds wrote:
> Block diagram of using a modified version of the DO controllers to compare
> several disciplined oscillators. The single logging PC could be several PCs
> as a way to have enough serial ports.
> http://i307.photobucket.com/albums/nn306/stanleyreynolds/planB.jpg
>
Th
Block diagram of using a modified version of the DO controllers to compare
several disciplined oscillators. The single logging PC could be several PCs as
a way to have enough serial ports.
http://i307.photobucket.com/albums/nn306/stanleyreynolds/planB.jpg
_
I have the same project on my list. In a general sense my idea is to log as
much as possible at the same time.
Room temp, power, and any logs from the discipline oscillators. For the first
cut a counter for each oscillator with a common time base using a IEEE-488
interface bus, also known as th
Hi all
I think we need a reference / FAQ for this type of question that comes
up so often. Another group I subscribe to (Geiger Counter Enthusiasts)
has a sub group were they just have the best replies to the FAQ's
Regards,
Robert G8RPI.
--- On Wed, 2
Robert Atkinson wrote:
> What's the lowest frequency crystal made? Anyone have any suggestions
> for an oscillator circuit?
Hello Robert,
you can find a suitable circuit in my 1979 publication in the VHF
Communication magazine "Design of crystal oscillator circuits".
A free download of th
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