Hi,
There's a copy of the manual at: http://www.ko4bb.com
What are the symptoms?
Angus.
On Tue, 1 May 2018 10:18:35 +0100, you wrote:
>Hi all new member hear could any of you help with the following information
>
>
>
>As I have just bought a Racal 9475 Rubidium and
using the heat shrink supplied and went for self amalgamating
tape instead for sealing the crimp. I really should try the unused
heat shrink on something to see how it does.
Angus.
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ich are impossible to seal without large
quantities of sealant or whatever.
Angus.
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even better if you can monitor the wiper voltage when adjusting
it.
Angus.
On Sun, 24 Dec 2017 16:26:43 -0600, you wrote:
>I think I need to clarify what I mean by "backlash". It is not simple free
>play in
>the adjustment mechanism- it is something much more irritating, as fol
That near the end of the temperature range the direction could also
give a good indication - assuming that there is only one problem...
I think the 8600-3 is still an AT - the 8607 is SC.
Angus.
On Fri, 8 Dec 2017 15:40:08 -0500, you wrote:
>Hi
>
>One basic question - Is the frequ
The 8601 that I have was about 2 deg C off turnover when I got it, but
I can't remember what sort or frequency error that caused. The
temperature coefficient was terrible with that error.
Angus.
On Fri, 8 Dec 2017 13:05:14 + (UTC), you wrote:
>
>Gentlemen,
>We have an Oscilloqu
for others, which is often the story for cheap low volume ones.
In the end I gave up and bought a Prologix - which appears to be a
common end result of buying and wasting time on cheaper ones.
Angus.
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BTW if anyone is thinking of visiting www.morion.com.ru this might not
be a good day - when I tried earlier the AV claimed it was infected
and the script blocker went nuts, so they did seem to have got
infected by something.
Angus.
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Hi,
Also, since it's a p rather than any other character, my guess is that
it probably was deliberate - although whether it was meant to be
shipped like that is another question.
Angus.
On Wed, 12 Jul 2017 11:56:24 -0400, you wrote:
>Well ASCII * is 2a in Hex, p is 70 so that se
'. The only references to a placeholder that
I saw in the manuals referred to an asterisk.
The firmware version is 4613.
Anyway, just wondering if anyone knows if this is correct, or maybe
it's just the EPROM starting to fail.
Thanks,
Angus.
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Hi,
If you've not already looked, it would be worth checking on the
EEVblog since there were some discussions there on faults in these
units - particularly the capacitor and lamp voltage issues.
One of the temperature controllers could be a little unstable too.
Angus.
On Tue, 23 May 2017 09:40
Hi Bob,
This is a phase plot of a rubidium to an M12 from a test that I did
back in 2008. The offset and ageing have been removed, but there is
still a bit of wander.
As with your plot, constellation related issues appear the most
obvious. Peak to peak is fairly similar too.
Angus.
On Thu
t be around 1E-14 at 1 day.
The bit that I'm not so sure about is the travelling. A long period of
movement, vibration, magnetic fields, etc. all adding in could
obscure the effects of time dilation.
It might be quite possible, although a nearby mountain an
if it's being used as a
general purpose reference.
Of course, the problem then is testing just how good it is
Angus.
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s would be.
Looking at export/technology controls might be useful early on too,
since we're going for high performance.
I've often wondered how a 21st century version of a 5065 would
perform, so it's great to see that I'm not completely alone in my
insanity!
Angus.
Hi,
I know this has been asked about a few times over the years, but I've
not been able to find any user or service manuals for an Austron 2010B
to download anywhere - anyone know of any?
Thanks,
Angus.
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.
Angus.
On Wed, 5 Oct 2016 16:45:21 -0700, you wrote:
>This is tangentially on topic, I suppose. Its for my GPSDO.
>
>I notice periodically that the phase measurements seem noisy. You can see
>that over the course of several seconds the value doesnt change, then it
&g
reference and a multiplexer.
Later hopefully a separate TDC's though.
I'm up in the north of Scotland, so unfortunately not much in the way
of reference stations etc nearby, which does rule out some options.
Angus.
On Thu, 16 Jun 2016 17:53:39 +1000, you wrote:
>I promised a plot and h
difficult. Some tests with other receivers and corrected or
sawtooth-free data would be a good start.
Angus.
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hearing about it, on or
off-list.
Thanks,
Angus.
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I've had that query before too, but in that case it turned out to be
that by default some receivers/software report Mean Sea Level and
others Height Above Ellipsoid, or both.
Angus.
On Wed, 8 Jun 2016 20:33:58 +, you wrote:
>
>I have just installed a Thunderbolt here to get ou
that it is for the next pulse, but I've not
checked it with a counter.
Angus.
On Thu, 2 Jun 2016 08:28:58 +, you wrote:
>The Ublox receivers do not have a message that outputs GPS time directly.
>It's easiest to take the UTC time message and subtract the leapsecond offset
>to get
.
Anyway, it's good to see that the 5065A is better behaved - I'm just
more jealous now! I look forward to seeing the results of your tests.
Angus.
On Sun, 22 May 2016 08:58:16 -0700, you wrote:
>Angus,
>
>The HP 5065A has a fairly open path from atmosphere to the cells as far a
>baromet
one that they want to
upload or whatever... ideally with sawtooth correction :)
Angus.
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hear from somebody who knows how this type
of thing is actually adjusted in production.
Angus.
>> If this is a double oven, there are two oven circuits and two oven
>> controllers.
>> Both would have a set point and both would be adjusted somehow. The pot
>> may be the adjustm
of the problems of the data sheet is that it is really tailored
for those using it as a flow converter - some of the text does not
even make sense otherwise. That was one of the reasons I was planning
to test it more as a TDC, but just getting back to doing t
useful because it allows you to test
the whole measurement system rather than just the TDC noise which
should be way below 1ns peak-peak.
Angus.
On Tue, 24 Nov 2015 14:04:32 -, you wrote:
>Hello,
>
>
>
>I have an ACAM GP22 TDC chip and evaluation board which I am looking
Hi,
PM6681's turn up at quite a good price too, and you get a lot of
extras over the 6680 - does anyone know if Timelab will work with a
6681?
Angus.
On Sun, 15 Nov 2015 15:10:42 -0800, you wrote:
>Thanks Bob
>
>I'm using the actual time pod for paying activities. This would be
On Sun, 23 Aug 2015 23:36:27 -0400, you wrote:
Hi Angus,
Thanks for your reply. My original suspicion is the +6.5V rail. That needs
to come from somewhere, and you need headroom if it's an unregulated input.
Pumping 2A through a regulator like that is no easy feat. Although rated
for 3A, you
or 15V selector link.
I'm not suggesting that it's a 12V osc - on my 57963-80 it is
definitely fed just 5V from the regulator. I also used 6V for the
power supply.
It also appears just to be a basic, fast warm-up AT OCXO, which fits
in with the short time constant on the GPS control loop.
Angus
the seller said that
they had no connection info, who tested it and how is anyone's
guess...
Angus.
On Sat, 22 Aug 2015 14:02:35 -0400, you wrote:
Hi Arthur,
Thank you for this information. I have not received my board yet, I
probably still have a few weeks to go. The LT1764 will take up to 20V
or similar.
(Above pin numbers assume V+ is connected to pins 44-50 and are
hopefully correct, but always worth checking)
Angus.
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.
Angus.
On Thu, 05 Mar 2015 01:27:23 +, you wrote:
Hi,
I've not seen any mention of anything other than the TDC1000.
I was a bit surprised that they went down the less-integrated route
and separated the TDC, but it turns out that for a lot of the sort of
things they designed it for, a uC
- I suspect that the specialist distributors would
be just as happy as the customers would be!
Angus.
On Tue, 03 Mar 2015 15:43:25 -0800, you wrote:
Hi Angus:
Do you know if they have an IR pulse front end which would be more interesting
than the ultrasonic front end?
Mail_Attachment --
Have
In case anyone is interested, the full data sheet is on the TI site
now, although I didn't see any actual IC's yet other than the ones in
the eval boards.
Angus.
On Tue, 17 Feb 2015 21:24:08 -0200, you wrote:
Initial datasheet:
http://www.ti.com/lit/ds/symlink/tdc7200.pdf
EVM:
http
Hi,
Can anyone tell me if there is a particular method for removing the
oven from the flask in a FTS 1200 or 1000A - it seems pretty well
wedged in there.
Thanks,
Angus.
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of where the particular GPS you are testing thinks
it is?
Angus
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the supply and see what happens.
You may have done this already, but I just didn't see it mentioned.
Angus.
On Thu, 11 Dec 2014 07:13:14 -0500, you wrote:
Yeah, I suffer from time-nuts digest lag, family lag, day job lag,
among other things. So please excuse delayed responses
On Sun, 7 Dec 2014 19:34:02 -0500, you wrote:
Hi
On Dec 7, 2014, at 7:15 PM, Angus not.ag...@btinternet.com wrote:
On Sat, 6 Dec 2014 11:47:10 -0500, you wrote:
I am looking forward to long term data on the Lucent unit. GPSDO's are
getting closer and closer to Cesium. Having worked
the simple time interval measurements that the Acams or
THS788 do.
Now if only they did a pure TIC version - but that might be a little
optimistic since Acam also seem to be really pushing the flow meter
side. That must be where the volume is...
Angus
pressure changes?
Combining temp control, air pressure compensation and drift
compensation can give very good results with the right Rb.
Angus.
In a message dated 12/6/2014 10:46:57 A.M. Eastern Standard Time,
kb...@n1k.org writes:
Hi
On Dec 6, 2014, at 10:35 AM, Magnus Danielson
mag
+heater+40%C2%B0+QH40A/?card=724
Angus
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that there are actually a few breakout and
development boards on aliexpress based on the TDC-GP21, which is very
similar to the GP22.
Nothing as impressive as a complete frequency counter of course, but
might be a quick and painless way to start playing with the chip.
Angus
- I did wonder if it might be possible to see
that and other info if the software was installed and run, even
without their board connected, but did not try that yet.
Angus.
2014-11-28 0:20 GMT+08:00 Tom Van Baak t...@leapsecond.com:
Your project sounds wonderful. The TDC-GP22 has been
for clocks 6MHz, and not in Mode1 which is being used.
Should still be enough to give most counters a workout.
Angus.
The biggest problem I met:
If you trigger start first, 100ns later stop1, another 100ns later
stop2.Get the result of stop1-start and stop2-stop1. You will find
stop1-start is very
anyway, and with quartz that
has not had days or even weeks to settle it's a total pain.
Angus
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to be at
least 3ppm off the input frequency to get quite that low.
The newer series seem to need a bit of an offset too:
https://www.febo.com/pipermail/time-nuts/2014-September/086701.html
Angus.
Best regards,
Charles
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Google Scholar finds 2 links under the original name too - it can be
quite good for finding free copies easily.
Angus.
On Thu, 23 Oct 2014 17:30:22 -0400, you wrote:
More than one way to skin an egg, or something like that anyway:-)
A Google search on Vaish Milliren turned up this paper
pipe cooler a couple of weeks
ago - did you happen to compare the temperature across the unit with
direct fan cooling and the heat pipe cooler, or with different heat
pipes?
Angus.
I finally got around to playing with a couple of laptop heat pipes,
fixed to a 25x50x75mm block of aluminium which
to compare the temperature across the unit with
direct fan cooling and the heat pipe cooler, or with different heat
pipes?
Angus.
On Sat, 28 Jun 2014 12:37:37 -0400 (EDT), you wrote:
Will someone beside us use heat pipe. Would love to have an impendent
input. What does it take to get a test
Hi,
I noticed these while wasting yet more time on ebay, and was wondering
if anyone knows anything about them.
Trimble 57963-80-D PCB
#301124758583
I'm assuming that it's a GPSDO board that the oscillator is sitting
on.
Thanks,
Angus.
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of the projects I've come across don't stretch its performance so
I'm just interested if someone has really tested it.
If not, I expect I'll find out more when I get it up and running.
Angus.
On Fri, 4 Apr 2014 18:27:05 -0400, you wrote:
Angus
An interesting chip. I had never heard of it before
.
A few years back a some folk were talking about it, but I did not hear
much since that.
Angus.
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, although much
is on the GPS Rb's which unfortunately will not be cheap surplus any time soon
- unless someone really messes up!
Angus.
From: Hal Murray
To: Discussion of precise time and frequency measurement
Sent: November 3, 2013 9:28 PM
Subject: Re: [time-nuts] The 5MHz Sweet Spot
Do low
for some things, but I tend to avoid them like the
plague, or immediately turn them to sine, unless I need them. It just depends
what it's wanted for.
Angus.
From: Bob Camp
To: Discussion of precise time and frequency measurement
Sent: September 27, 2013 12:44 AM
Subject: Re: [time-nuts] Clock
/dokuwiki/doku.php?id=precision_timing:fe5680a_faq
if you have not already seen it.
Angus.
From: Bob Stewart
To: Time Nuts
Sent: September 22, 2013 10:12 PM
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
I hadn't thought of using a pullup resistor. I'd have to get out the
calculator
Hi,
I may have missed something back then, but I don't recall any description of
exactly how it was generated - more a discussion of what the manuals/datasheets
meant.
Angus
From: Bruce Griffiths
To: Discussion of precise time and frequency measurement
Sent: September 19, 2013 8:22 AM
to
fluctuating air pressure as predictably.
Angus.
From: Bob Camp
To: Discussion of precise time and frequency measurement
Sent: August 16, 2013 7:45 PM
Subject: Re: [time-nuts] My GPSDO project: OCXO Thermal Oscillation?
Hi
With the 5335 you have a measurement with dead time. That makes things a bit
which cooled the whole thing well.
Angus
From: Magnus Danielson
To: time-nuts@febo.com
Sent: August 10, 2013 12:01 AM
Subject: Re: [time-nuts] Rb video
On 08/09/2013 03:09 PM, Bob Camp wrote:
Hi
A few observations:
1) He talks about using a heat sink on the front panel, but then never shows
or an optocoupler circuit
that did not have enough gain to pull the line close to 0v. ( that was a while
ago though - not so much 'legacy' as 'vintage'! )
Angus.
From: Bob Camp
To: Discussion of precise time and frequency measurement
Sent: July 26, 2013 1:37 PM
Subject: Re: [time-nuts] RS
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to 1E-14 to avoid messing
with the EFC at all.
Angus.
On Fri, 25 Jul 2008 20:33:26 -0400, you wrote:
If I choose to control the frequency via External C-field control I guess it
would take a very precise and stable voltage source. Any thoughts or
suggestions?
- Original Message -
From
me wonder what they came from -
a heap of working 58503's going to landfill is close to sacrilege :-)
Angus.
On Sat, 12 Jul 2008 11:20:57 -0600, you wrote:
Message: 2
Date: Wed, 9 Jul 2008 12:10:52 +1000
From: Jim Palfreyman [EMAIL PROTECTED]
Subject: [time-nuts] Double ovened 10811-60158
fine with
any other oscillator that I've tried on it, even if connected at the
same time as the 1000B - although each with its own filter.
I have a horrible feeling that it's just the crystal slowly dying, but
hopefully it's less terminal.
Thanks,
Angus
of a
Miniature Rubidium Atomic Frequency Standard
Angus.
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has an RS232 port which makes logging the data very simple on
any computer.
Angus.
On Sat, 08 Mar 2008 17:49:02 +0100, you wrote:
Dear group,
I consider buying a used lab frequency counter / timer --preferably
HP/Agilent-- covering from few mHz to perhaps 400 MHz. I'm worried
that models
- which seem to be becoming
rather less common now.
As well as having a plot of ADEV or its relations, seeing what the
reference is doing and when is useful, and most ADEV plots using so
few values of tau does not help.
Angus.
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, and the precision/position of each rising edge -
anyone got any info on this?
Thanks,
Angus.
Thus to reduce the measurement error due to this instability to better
than 1E-10 or less the counter gate time will need to be around 1000
seconds or more.
Adjustment to better than 1E-10 will be somewhat
a heap of other errors,
I do wonder what improvements in performance would actually be seen in
the output from the oscillator - which is all that a lot of people are
really interrested in.
Angus.
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Hi,
Although they are rather less common and more expensive than the ones
you mentioned, Fluke/Philips 6681 counters are also very good.
Nominal resolution is 50ps single shot and 1ps repetitive.
No RS232, but GPIB and a rather basic analogue output are standard.
On Mon, 19 Mar 2007
On Sun, 25 Feb 2007 09:52:55 -0600, you wrote:
Angus wrote:
Although that's not what I was talking about doing above, I think that
it's pretty much what some of the hardware GPSDO's actually do using
various types of oscillators (and to good effect too). As in these:
http
On Sat, 17 Feb 2007 08:50:56 -0600, you wrote:
Angus wrote:
On Fri, 16 Feb 2007 17:44:14 -0600, you wrote:
Richard W. Solomon wrote:
I looked at the ACE-III on Trimble and do not see mention of a 10 KHz
output.
Maybe I miised it, but without it, the N1JEZ board will not do unless
sensitivity made things more difficult.
BTW, with a standard GPSDO, would using the 100Hz/10KHz the pulse not
reduce the need for a fast comparator clock, and also reduce sawtooth
effects?
Angus.
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