Ah, OK. So you keep the antenna connected and you keep the
GPS receiver in position hold mode, still receiving fixes.
All you're doing is disabling the software disciplining algorithm.
That sounds like a good test. Let me try this too and see if I
agree with your conclusions.
I'll try to simultan
Interesting... I just fixed a couple of Tek CG551 and 5001 calibration
generators that had the same problem. Tek uses a DC isolated shift register
chain to drive the internal control signals. The clock and data lines run
through toroidal pulse transformers that are mounted on small plastic
Tom
I turned of the OCXO discipling using Thunderbolt monitor menu:
Control:Disable Discipling
Then I used the Window: Logging Dialog box to enable logging of
1) Time of week (sec)
2) PPS offset (ns)
3) 10MHz offset (ppb)
4) DAC voltage
5) Temperature
to a data file for about 40K sec.
The
Hi Bruce,
Couple of questions. To me the plot looks like it is dominated
with measurement noise (negative slope on the left) and OCXO
frequency drift (positive slope on the right).
You mention "GPS receiver noise" but I don't see that in the
plot. Is this a free-running TBolt? If so, what 1pps so
Dear Time-Nutters
I wish to humbly apologize to the over 749 subscribers to this list
for my stupid rantings. I had a very bad day and this had pushed me
into a manic state, which is a problem for someone with bipolar.
Rest-assured, it will be a couple of weeks or so before I can dig
myself out of
If one turns of the disciplining of the Thunderbolt's internal OCXO,
then one can log various parameters such as the 1 pps error.
A plot of the resulting OADEV (all tau) using such data is attached.
For short tau the GPS receiver noise dominates.
For large tau the OCXO noise dominates.
If the OAD
> Short term stabilities of a bunch of quartz oscillators.
>
> I had posted this some time ago but this is an updated version.
Corby,
Nice set of measurements.
Here are ADEV plots of your oscillators:
http://www.leapsecond.com/pages/corby/adev1.gif
http://www.leapsecond.com/pages/corby/adev2.gif
> The problem with the oscillator turned out to be even easier to fix than
> I could have hoped for. There's a ferrite transformer on the output -
> possibly a balun. The wire is about the thickness of a hair. The
> ferrite isn't tied down - it's just held by the leads. I don't know if
> it to
I was reluctant to consider a torch because I haven't done it and didn't
want to cause any more damage. The second (and more serious) reason is
that I live in an apartment. My office / computer room / mad
scientist's lab is actually a bedroom complete with carpet. Soldering
irons I can deal
I notice there are no ISOTemp's OCXO's on the list, are they
uninteresting or just hard to lay hands on ?
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can a
Joseph M Gwinn skrev:
> time-nuts-boun...@febo.com wrote on 01/20/2009 04:32:15 PM:
>
>> Bruce Griffiths skrev:
>>> The relatively low thermal conductivity of the steel can will help
>>> considerably in avoiding thermal damage if the heat is
>> applied to the joint.
>>> If the can were copper it
time-nuts-boun...@febo.com wrote on 01/20/2009 04:32:15 PM:
> Bruce Griffiths skrev:
> > The relatively low thermal conductivity of the steel can will help
> > considerably in avoiding thermal damage if the heat is
> applied to the joint.
> > If the can were copper it would be much more difficult
Date: Tue, 20 Jan 2009 12:35:35 -0800
From: Corby Dawson
Subject: Re: [time-nuts] More quartz short term stabilities
To: time-nuts@febo.com
Message-ID: <20090120.123535.3172.1.cdel...@juno.com>
> Short term stabilities of a bunch of quartz oscillators. I had
> posted this some time ago but
Bruce Griffiths skrev:
> The relatively low thermal conductivity of the steel can will help
> considerably in avoiding thermal damage if the heat is applied to the joint.
> If the can were copper it would be much more difficult to avoid thermal
> damage.
When I needed to have a McCoy oscillator ca
Not sure why my email to this list is lost or delayed but some does get thru.
Working on a parts list and circuit diagram for the FTS 1000 which can be found
here:
www.n4iqt.com/fts1000b
Stanley
From: Stanley Reynolds
To: time-nuts@febo.com
Sent: Tuesday
Short term stabilities of a bunch of quartz oscillators.
I had posted this some time ago but this is an updated version.
In answer to Ulrich's earlier question on the FTS 1200 #1 I retested it
in
the same setup as the FTS1200 #2 and it still showed the results
below. The Piezos are the 10811 c
The relatively low thermal conductivity of the steel can will help
considerably in avoiding thermal damage if the heat is applied to the joint.
If the can were copper it would be much more difficult to avoid thermal
damage.
Bruce
John Miles wrote:
> You probably have a lot more room to play with,
Knowing the knowledge of many members of the list I hope to find an answer
to the following question.
Can somebody help to identify and give hints for documentation for the
following instrument.
Weinschel 1103-5GPA rf power transfer standard.
Basically this is a thermally insulated thermistor mou
John Ackermann N8UR wrote:
> Folks, this started out as an off-topic question about getting
> inoculations, and has turned into something even more off-topic and less
> informative.
>
My appologies for starting this. For the record, I asked similar
questions on a couple of other forums where
In message: <8cb492c1a47292d-1178-...@mblk-m35.sysops.aol.com>
n3...@aol.com writes:
: In all of this Anglo American battering there is one thing we can agree on.
:
: Jason Bourne can kick James Bond's butt (or arse).
Jason Bourne can kick James Bond's butt
but
James Bond can kick Jas
Hello,
Tuesday, January 20, 2009, 17:26:00, Richard M. Hambly wrote:
R> One of my 53132As, an Agilent unit, s/n KR01202209 fail the power-on self
R> test with a FAIL:ROM error message.
Cannot say anything about your particular counter, but very often such
error is due to 'leaked' EPROM chip, tha
You probably have a lot more room to play with, given the larger housing on
your OCXO. The ULN series is rather densely packaged, and that was one
reason why I wasn't crazy about going after it with a propane torch. In
your case I'd be tempted to try the torch method before actually damaging
the
I'd be inclined to take the error message at face value; you have some
corruption in EPROM or flash memory that isn't in an area that gets used
during the measurements you're making. Contacting an Agilent rep would make
sense, as the 53132A is new enough that there might be an easy way to
upgrade/
Thank You! John
Had
K7MLR
At 08:31 AM 1/20/2009, you wrote:
>Folks, this started out as an off-topic question about getting
>inoculations, and has turned into something even more off-topic and less
>informative.
>
>Time-nuts now has over 750 subscribers who joined the list because they
>are int
Folks, this started out as an off-topic question about getting
inoculations, and has turned into something even more off-topic and less
informative.
Time-nuts now has over 750 subscribers who joined the list because they
are interested in a high signal-to-noise ratio discussion of precise
time
At 02:17 AM 1/20/2009, you wrote:
>Chuck,
>
>Well, I've heard the same sort of stereotypical comments about the
>Brits so many times I am fed up with them too. Besides which of those
>comments can you say does not have an air of truth about them for
>someone coming from England, or may other places
In all of this Anglo American battering there is one thing we can agree on.
Jason Bourne can kick James Bond's butt (or arse).
___
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To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nut
All,
One of my 53132As, an Agilent unit, s/n KR01202209 fail the power-on self
test with a FAIL:ROM error message. During the test the front panel display
looks quite odd compared with the other counters. If I ignore the error and
press Recall (my settings are in Recall 1) I can proceed to what
Now I understand! I was planning to reuse the case. It didn't occur to
me to sacrifice the case and put the oscillator in another box.
Thanks for the idea, John.
Ed
> Message: 3
> Date: Mon, 19 Jan 2009 21:20:54 -0800
> From: "John Miles"
> Subject: Re: [time-nuts] Wenzel Oscillator Repair
>
Robert
Thanks, looks like the hassle factor is greater than the fun factor on
this one :(
Guess I'll have to start a search for an HP58532A, VIC-100, Vaisala or
similar. I don't think a cheapy £4 patch antenna will give the same
performance.
regards
Grant
> Hi Grant,
> Keep the Palisade
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