Peter Vince said the following on 12/20/2006 10:11 AM:
I could be talking a lot of hot air, so please forgive me, but I've
had a thought: if PCs still use a Real Time Clock chip, could a hardware
modification be done to give them an accurate clock frequency, rather
than relying on
I have pinouts of the BCD connector at
http://www.febo.com/hardware/PTS/index.html.
Note the big red warning sign -- the first 250 I had was in some way
goofy and that led me down an erroneous path for the pinout. The pinout
described for the 160 is correct for all the units (at least the
Tom Van Baak wrote:
Speaking of timing, today is the 5th anniversary of
our time-nuts mailing list. Thanks to all of you who
have made this such a great list over the years. The
quality of the postings has been rather amazing.
For example, the long posting two days ago by Brian
Kirby
John Ackermann N8UR wrote:
I have pinouts of the BCD connector at
http://www.febo.com/hardware/PTS/index.html.
Screwed up the URL -- it's
http://www.febo.com/time-freq/hardware/PTS/index.html
Sorry about that.
John
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This got caught in the spam filter for some reason. Sorry for the delay
in fishing it out.
John
- Forwarded message from SCOMM -
From: SCOMM [EMAIL PROTECTED]
To: time-nuts@febo.com
cc: [EMAIL PROTECTED]
Date: Sun, 10 Dec 2006 23:17:25 -0600
I AM LOOKING FOR A DATUM-AUSTRON 2201
I'm not sure if this timing is right for the coronal ejection to hit
earth, but I see from my NTP plots* that my WWVB receiver apparently
lost lock at about 0200 UTC last night. It looks like it recovered
within a half hour or so (I'll need to look at the logs in more detail
to figure out the
I was about to mention, but you beat me to it...
I've just finished modifying a stack of Soekris net4501s using
Poul-Henning's hardware mods and his nanoBSD configuration that runs
from flash card. Details on the hardware mods are at
http://www.febo.com/time-freq/ntp/soekris/index.html. I still
From a closer examination of the photos, it looks a lot like the old HP
splitters -- I wonder if Symmetricom took those products over when it
bought the TF business?
John
Jason Rabel wrote:
John,
For some reason your first reply didn't show anything in the mailing list
archives. I
Jason Rabel said the following on 11/28/2006 01:26 PM:
Just a heads up, someone has been listing a bunch of Symmetricom
090-58537-01 4-Port GPS Active SmartSplitters' on eBay. Usually about 3 or 4
at a time. I managed to win one for $41, but I've seen them ending at over
$125! So if you are
Hal Murray said the following on 11/28/2006 08:09 PM:
From the pictures I couldn't tell for sure -- are those N connectors?
Yes.
I had to search the data sheet to find the answer.
Thanks!
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Really interesting analysis, James. I'll need to do some checking to
determine my distance from W1AW, and where that puts me in the skip zone.
John
James Maynard said the following on 11/19/2006 02:08 PM:
John Ackermann N8UR wrote:
Without giving away any actual numbers, did anyone else
Without giving away any actual numbers, did anyone else notice either a
fuzzy signal, or some interference within about 1 Hz of W1AW on 40M?
I recorded the entire test run and have been unable to prove to myself
exactly where W1AW is; almost any sample of data I select shows two
signals within
On 11/16/06, John Ackermann N8UR [EMAIL PROTECTED] wrote:
Hi Bert --
We tend to talk about FMT techniques before the test, and a little bit
about propagation, etc., afterwards. But I don't share, and I don't
think anyone else should share, results until after the submission
deadline
That's interesting -- from your earlier message, I thought they were
still running the Harris exciters for the test itself. It'll be
interesting to monitor the drift during the test.
My plan is to record audio (W1AW plus my known-frequency marker) of all
three bands simultaneously for the whole
Hi Colin --
Actually, the transmitters used for the FMT seem to be very stable and
as far as I've been able to observe (during each of the 4 FMTs since
they restarted the event) don't drift by a noticeable amount during the
test.
I'm actually more concerned about the ARRL's measurement setup
Ackermann N8UR [EMAIL PROTECTED] wrote:
Hi Colin --
Actually, the transmitters used for the FMT seem to
be very stable and
as far as I've been able to observe (during each of
the 4 FMTs since
they restarted the event) don't drift by a
noticeable amount during the
test.
I'm actually
Hal Murray said the following on 11/10/2006 04:52 PM:
I think one of the reasons this method works so well is that the FFT
effectively averages the signal over some time, and I use a tool in
the software to derive an average across all the FFT results. That
smooths out the instantaneous
Ulrich Bangert wrote:
Agreed! But you are talking about things that happen INSIDE the physics
package, don't you? Ok, let us assume that there WERE big differences in
the physics packages that need to be compensated for. In THIS case the
tunable synthesizer would indeed make sense and even
Not HP, but it seems that manuals for Austron gear are always hard to
find. At the moment, I'd like to find one for the 1210D portable clock.
John
Jack Hudler wrote:
Thanks John, I wonder if the group has any requests.
I'm working on a personal project to scan a considerable archive
be nice to get it
back to original. I may just have to go with external backup batteries. - 73
- Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of John Ackermann
:[EMAIL PROTECTED] On
Behalf Of John Ackermann N8UR
Sent: Monday, November 06, 2006 5:52 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Austron 1210D-03
My local Batteries Plus was able to order the cells for me. They're
called F cells and are normally
Didier Juges said the following on 11/05/2006 09:42 AM:
Anyway, how do you compute the Allan Deviation of a sun dial?
Oh, God, now someone's going to do it...
John
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Doug Millar said the following on 11/03/2006 09:57 PM:
Should we be considered certified time nuts? or
just certifiable?
Depends on whether you're traceable to NIST...
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Sorry for the advertisement, but I thought this would be of particular
interest to the folks on these lists.
Some time ago I mentioned that I was working on a clock synthesizer
board that could be used (among other things) to get much better
timekeeping for applications like NTP.
The idea is to
Tom Van Baak wrote:
I've recently acquired a Rubidium Osc ( Efratom FRS-C 10Mhz) as my
first venture into this field. It's working as per the spec given
,checked against Trimble GPS with 1pps output.
Can you point me to somewhere where there is a description of the
physics behind the
One word: Cool!!
John
Tom Van Baak said the following on 10/29/2006 01:18 AM:
For those of you who are both chemists and time nuts,
here's an amazing video about rubidium and cesium...
http://video.google.com/videoplay?docid=-2134266654801392897
Do any of the UK readers know
Didier Juges said the following on 10/28/2006 12:18 AM:
The clock shaper uses a commercial 10.7 MHz IF transformer, readjusted
down to 10 MHz (see schematic at
http://www.ko4bb.com/ham_radio/Manuals/2_GPS_Stuff/Clock_Shaper.jpg).
It provides light loading to the OCXO through the 390 ohm
I managed to pick up the Austron 1210D-03 portable clock that was
offered up here a little while ago, and the thing is ticking away nicely
on my bench. However, I don't have any docs for it, and in particular
the PPS sync and slew controls on the front aren't entirely
self-explanatory.
Does
While messing with the 1210D-03 I found that the frequency is a bit low
(about -1Hz) and is beyond the range of the fine adjust on the front panel.
There's a coarse adjust hole on the rear panel, but using various tuning
tools including a long, thin screwdriver I can't seem to engage the
They only do their measurement at the time they announce each band, but
all the signals are running simultaneously so you can use them if you dare.
John
Didier Juges said the following on 10/27/2006 09:06 PM:
It is back to the previous method of sending a clean CW signal.
I did not
I set up a wiki at http://www.febo.com/time-nuts quite a while ago with
the idea that it might serve as a place to collect various useful bits
of information. It really hasn't had any use at all to date.
Some of the recent discussions here lead me to suggest that we try to
revive the wiki and
Hi Didier --
I have written a bunch of simple programs for GPIB data gathering, using
perl and the linux-gpib libraries under Linux. However, the code is
pretty straightforward and it should be easy to extract the command
strings to send to the counter. From that, you should be able to
re-write
Didier, a few comments embedded below.
John
Didier Juges said the following on 10/22/2006 10:34 AM:
Hi Warner,
Does it mean I should divide the 10 MHz down to 1 Hz output and use the
5370 to measure TI compared to it's internal timebase once per second,
and feed that to the
Dr Bruce Griffiths said the following on 10/22/2006 07:19 PM:
An inexpensive modern time interval counter with a power dissipation of
less than 10 watts and a resolution comparable to the 5370 would be
useful for such comparisons especially if the experiment lasts several
months.
I don't
Dr Bruce Griffiths said the following on 10/22/2006 07:33 PM:
Didier
If you are going to use a PPS divider to divide the oscillator frequency
down to 1Hz, you will need to measure the inherent jitter of the divider
to ensure that it doesn't degrade the measurement resolution. It may be
Dr Bruce Griffiths said the following on 10/22/2006 08:24 PM:
Reading between the lines on the Jupiter GPS receiver datasheet it would
appear that the 10KHz output is phase modulated at 1Hz to realign it to
successive PPS output pulses. As the PPS jitters about so does the 10KHz
signal.
not
have the 10811 time base. This will also be a lot easier on the UPS, as
we do loose power here somewhat regularly (but not for long, unless a
hurricane is involved) during the stormy season.
Thanks for another great suggestion.
Didier
John Ackermann N8UR wrote:
Dr Bruce Griffiths said
Henry Knoepfle wrote:
The November QST has an announcement for the 2006 Frequency Measuring Test
( www.arrl.org/w1aw/fmt - though the 2006 announcement has not made it to
the website yet). The object is to determine as accurately as possible the
carrier frequency of a signal sent from W1AW on
Yes, I should have put up a link with my other message:
http://www.febo.com/time-freq/fmt. In addition to info about my
measurement technique and my results from each year's test, there's a
link at the bottom of the page to some pictures from the 2003 test. We
have some newer ones but I
Poul-Henning Kamp said the following on 10/18/2006 05:48 PM:
I'm not sure if the firmware of the 8566B is different from the 8568B,
anyone know ?
I'm pretty sure that the '66 firmware is different than the '68, or I'd
offer to copy mine for you.
I think this is the second report of eprom
You make us proud, Tom. :-)
John
Tom Van Baak said the following on 09/28/2006 08:06 PM:
It was only a matter of time before google led a curious
reporter to our mailing list. Let me know if this shows
up in your local newspaper in the next few weeks...
Brooks Shera said the following on 09/19/2006 06:48 PM:
The excerpt below from GPS World refers to a Chip-scale atomic clock being
developed by DARPA.
Does anyone know what technology they might be using for such a clock?
Atomic Clock Synchronization
The U.S. Navy Space and Naval
Thought this would be of interest to the group...
Original Message
Subject: More on Len Cutler
Date: Thu, 14 Sep 2006 10:45:33 -0600
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Len Cutler Leaves a Lasting Legacy
Agilent mourns the loss of Len Cutler, Agilent Distinguished
[EMAIL PROTECTED] said the following on 08/25/2006 10:23 PM:
Hi Didier,
I tried this with a Maxim video amp, and my 10MHz noise floor went from
-155dBc/Hz on the input to about 80-90dBc/Hz on the output of the amp.
80dBc is great for Video (generally arund 50dB SNR), but for timing
Hal Murray said the following on 08/26/2006 03:39 PM:
That's interesting. The MAX477 video amp that is used in the TADD-1
(http://www.tapr.org/kits_tadd-1.html) does a lot better than that.
Here is a phase noise plot of the TADD-1 at 10MHz; it is better than
-105dBc at 1Hz and reaches a noise
Thought this might be interesting. I took a spectrum analyzer shot of
my ICS525 Clock-Block synthesizer at 250MHz, and overlaid it with a
shot of an RF signal generator (Marconi 2202A) at the same frequency,
and using the same reference source.
The 2202A is designed for bench use and isn't noted
Being very lazy, I wonder if anyone has a bit of Javascript lying around
that converts the current time to MJD and displays it? I thought it
would be cool to put that on some of my plot pages so you can readily
figure out the age of the data.
John
___
Lots of goodies on that page; thanks! (And thanks to tvb, too, for the
link to his converter).
John
Joseph Gray said the following on 08/20/2006 03:23 PM:
You can steal some routines here:
http://www.merlyn.demon.co.uk/astron-3.htm
- Original Message -
From: John Ackermann
Poul-Henning Kamp wrote:
In message [EMAIL PROTECTED], John Ackermann N8UR writes:
There's information about my prototype (and a picture) at
http://www.febo.com/time-freq/hardware/ICS525/
Running at 200MHz, the third harmonic at 600MHz is only
down -11.5dB, while the 5th
We're pleased to announce that the TADD Enclosure is now available.
It's an attractive metal case designed to hold any of the TADD series
boards. You can get more information, and place an order, at
http://www.tapr.org/kits_tadd-enc.html (click on the small pictures on
the web page to see
Randy Warner said the following on 08/08/2006 03:23 PM:
I have been seeing a lot of traffic concerning making 10MHz frequency
dividers using PIC's. While they provide an elegant solution to
providing an accurate 1PPS from a precision source, I have to ask if
there is a reason for going this
Hi All --
Randy Warner asked me to host (at least temporarily) the 2MB manual for
the original Oncore VP. I have it at
http://www.febo.com/time-freq/hardware/VPCommands.pdf
John
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manual (John Day)
5. Re: GPS jamming (Robert Atkinson)
6. Loran timing experiment (John Ackermann N8UR)
7. Re: Leap second letters (Glenn)
8. Re: Leap second letters (Tom Van Baak)
--
Message: 1
Date: Wed, 26 Jul 2006 21:12
Rob K
- Original Message -
From: John Ackermann N8UR [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Tuesday, July 25, 2006 11:46 PM
Subject: [time-nuts] Austron 2100R Manual? Or Info?
I picked up a 2100R Loran receiver
Magnus, I like Tom's idea of plotting the 10MHz with no GPS signal, to
see if it's the oscillator or not, but I would go one step further and
disconnect the EFC input from anything to rule out any noise in the
control circuitry.
John
___
time-nuts
Poul-Henning Kamp wrote:
In message [EMAIL PROTECTED], [EMAIL PROTECTED] writes:
How much test equipment ends in a land fill?
RoHS also addresses this, the manufacturers have to take back
old equipment and dispose of it properly.
Actually, this is covered by a different set of rules in
I've always been curious about the 3325A vs. B -- there is more price
spread between those two than just about any other HP A vs. B model.
What's the difference between them, and is it worth anything like that
much (obviously, Mike doesn't think so :-) ).
I've been happy with my A model,
[EMAIL PROTECTED] said the following on 07/08/2006 11:58 PM:
I found that USB-GPIB controller. Looks like BSD and Linux are supported.
http://www.sparkfun.com/commerce/product_info.php?products_id=549
Hi, I bought one on Ebay, they work quite well. They used to be $99 at
bytes of attached devices. That
were two of the major reasons why i preferred them against other cheaper
circuits.
Regards
Ulrich Bangert
-Ursprüngliche Nachricht-
Von: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Im Auftrag von John Ackermann N8UR
Gesendet: Sonntag, 9. Juli 2006 13
Ulrich Bangert said the following on 07/09/2006 11:19 AM:
John,
of course, because it is simple serial communication, you don't get an
real pc interrupt on a device SRQ as would be possible with a hardware
GPIB pc card. You have to ask the interface in a fast manner to check
for the status
Glenn Powers said the following on 07/08/2006 05:27 PM:
Can anyone recommend a low cost GP-IB PCI card (and cable) that works
with FreeBSD and/or linux?
The National Instruments GPIB-PCI card goes for around $200 on eBay and
works well with the Linux-gpib driver.
John
Bruce Lanning wrote:
I am trying to compare my Freq, Std, HP-Z3801A GPS Receiver, to my home brew
Freq Std. using my Freq. counter, a HP-5245L with a Time Interval Unit
(HP-5262A) Plug in. Can someone help me. My counter Time Base opens about
6-8 times and then gives me a reading like
Thanks to all who've sent me their message files. I'm sure I have
enough to work with now to reconstruct the archives.
By the way, if any of you aren't aware, you can access the time-nuts
archives by going to http://www.febo.com/pipermail/time-nuts.
Unfortunately, they aren't searchable (yet)
Thanks to everyone who sent their message collection, or offered to.
The June 2006 archive has been rebuilt and should be working fine. If
you see any problems, please let me know.
John
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Jim Miller said the following on 06/08/2006 07:33 PM:
Hi,
I recently acquired two 5370B counters with bad input channels. One
has a bad start channel,
the other a bad stop channel. I have traced the problem to the input
board A3, which is the board directly behind the BNC connectors
Christopher Hoover said the following on 06/08/2006 09:11 PM:
I'm looking for a Spectracom NBS Frequency Standard Receiver Model 8160A
manual that I might copy/scan. Can anyone help?
Christopher, I have an 8164 manual which I think would cover almost all
of the guts of the 8160. I am hoping
be measured is 50nS, even though it has
0.1nS resolution. It does not have GPIB. This model had a D/A output
option, but my unit does not have it.
Thanks
Didier KO4BB
John Ackermann N8UR wrote:
Keith E. Brandt, M.D. said the following on 05/24/2006 06:06 PM:
What's a good entry-level
Keith E. Brandt, M.D. said the following on 05/24/2006 06:06 PM:
What's a good entry-level time reference system? I'm doing this for
the fun/learning/hobby and can't dump $10k into it (without also
incurring the attendant lawyer's fee for the divorce settlement :-)
I think
[EMAIL PROTECTED] said the following on 05/24/2006 08:23 PM:
Hello John,
I have several HP 5334's (A and B), and there is a trick how you can get
from 2ns (2E-09) resolution to 10ps (1E-11) on these great units.
To measure a 10MHz reference at 100micro Hertz resolution:
* Do an
TAPR is pleased to announce that the TADD-3 PPS distribution amplifier
kit is now available.
The TADD-3's primary use is to distribute 1 pulse-per-second signals
such as those obtained from GPS timing receivers, but it can work with
pulse signals up to at least 10MHz.
The TADD-3 provides six
I had a chance today to take a TADD-1 and one of the Spectracom 8140T
amplifier modules over to a friend who has an HP 3048 phase noise
measurement system. We got some very encouraging results.
First, as a point of reference the HP 5087A distribution amp is spec'd
at 5MHz to have phase noise
John Ackermann N8UR said the following on 04/23/2006 05:02 PM:
First, as a point of reference the HP 5087A distribution amp is spec'd
at 5MHz to have phase noise less than -145dBc(1 Hz) 1kHz from the
carrier.
We did our tests at 10MHz, so the results are precisely comparable
Geoff Powell said the following on 04/23/2006 05:42 PM:
Is PPS kernel discipline compiled into the default FreeBSD kernel?
No, but it's a pretty easy thing to turn on -- you add a line to the
config file and tell it to go. Pretty straightforward, *once* you find
the instructions.
I am not
Tom Van Baak said the following on 04/22/2006 01:47 PM:
Forget the spec, whatever it is. How about actually
measuring what happens to the quality of the signal
when you add the N+1st tap? Were these taps meant
for precision work? And is that quartz precision (1e-9)
or cesium precision
Brooke Clarke said the following on 04/22/2006 01:51 PM:
Hi John:
eBay auction 7605840019 says up to 25 boxes on the master coax. But I
suspect it's a function of the power supply in the main box.
73,
Brooke Clarke
Ah, thanks. I did some power measurements at one point but didn't
Bill Janssen said the following on 04/22/2006 01:33 PM:
You might try spectracom for info on that distribution amplifier. I
included a URL that you can try.
I didn't read the info so you may have to contact Spectracom for
additional info.
Hal Murray wrote:
The US is keeping Loran-C going as a backup for GPS as well.
How good is Loran for timekeeping? How does it compare to WWVB?
What sort of receiver do I need? Any good how-to type web pages?
I'm in Silicon Valley. The NIST map says that WWVB should work here,
the time so
it ticks over on the UTC second edge. Then do a real TOC sync.
More at:
http://www.pacificsites.com/~brooke/A2100F.shtml#2100T
Have Fun,
Brooke
John Ackermann N8UR wrote:
M. Warner Losh wrote:
Can't you recover the time by tracking multiple chains and using
Hi Don --
I know of several folks who've used the satellite stuff with pretty good
results, so I'd give it a try. I may be wrong about this, but my gut
feeling is that you would want to arrange things so that the longest
cable runs (with the most loss) would be terminated in their
characteristic
Poul-Henning Kamp said the following on 04/09/2006 02:07 AM:
No, I don't think so. But I've since found out that the abuse
pretty much all stratum 1 servers, including several .edu, .gov
and .mil servers.
Now they probably regret they didn't just pay off my claim from the
start.
I'm also
(and rephotograph) later today.
Sorry about that.
John
John Ackermann N8UR said the following on 04/09/2006 11:14 AM:
This morning I took 'scope shots of three 74AC04 gates paralleled
through 47 ohm resistors, and of a single gate through a 47 ohm resistor.
There's very little difference
Robert Lutwak said the following on 04/09/2006 04:04 PM:
I suspect you're just measuring the bandwidth of your 400 MHz oscilloscope.
-RL
That could well be, though since 74AC is supposed to have a slew rate of
2v/ns, I'm measuring not too far from what you'd expect -- and the main
goal was
Poul-Henning Kamp said the following on 04/09/2006 04:07 PM:
In message [EMAIL PROTECTED], John Ackermann N8UR writes:
For what it's worth, the risetime of the MAX232 output is about 2.5us,
in a very smooth ramp -- it's spec'd at 4 v/us. I have heard that the
risetime is deliberately slow
I didn't convert the PECL signals, but instead went inside the unit and
tapped off the 1pps and 10MHz signals. I have details at
http://www.febo.com/time-freq/gps/z3801a/mods/index.html
John
Don Mimlitch said the following on 04/09/2006 08:41 PM:
I have a HP Z3801A which outputs the 1 PPS
Brooke Clarke wrote:
Hi:
I've got the TVB 1 PPS PIC circuit working and would like to add an
output IC to drive 50 a couple of Ohm cables.
Need two outputs, the normal 1 PPS and also the 10 kHz output since I
think it would work with the SRS app note for making 1,000 TI
measurements in
. I'll try that when I'm finished reading the mail.
Have Fun,
Brooke
John Ackermann N8UR wrote:
Brooke Clarke wrote:
Hi:
I've got the TVB 1 PPS PIC circuit working and would like to add an
output IC to drive 50 a couple of Ohm cables.
Need two outputs, the normal 1 PPS and also
My 3325A often shows an amplitude calibrate fail at poweron, but if I
wait a few seconds and then hit the cal button, it passes. Not sure if
that's the same thing as you're seeing or not.
John
Mike Feher said the following on 03/18/2006 10:20 AM:
Ulrich -
I do not know what you mean by
PROTECTED] Im Auftrag von John Ackermann N8UR
Gesendet: Samstag, 18. März 2006 16:33
An: Discussion of precise time and frequency measurement
Betreff: Re: [time-nuts] Self Test Error 2 on HP 3325
My 3325A often shows an amplitude calibrate fail at poweron,
but if I wait a few seconds and then hit
Hans H. Jucker wrote:
For sale OSA 8600 BVA Oscillators (see specs.:
http://www.oscilloquartz.com/file/pdf/8600.pdf)
Hi Hans --
I'd be interested in one. What's the specific model number, and the price?
Thanks,
John
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Very nice, Tom. Thanks!
John
Tom Van Baak said the following on 03/15/2006 08:12 PM:
Someone asked a few weeks ago about a tool to
compute Allan deviation. There are quite a few that
I use, but here's a write-up about a simple windows
command line tool that I use.
By the way -- it builds just fine under Linux without any changes.
gcc -lm -o adev1 adev1.c
will yield an executable, with one warning because main() doesn't return
an int.
John
John Ackermann N8UR said the following on 03/15/2006 08:55 PM:
Very nice, Tom. Thanks!
John
Tom
Hal Murray wrote:
Not that I need one, but what's a ballpark price for one in working condition?
This is a broad range, but probably $1500-2500. A lot depends on the
condition of the tube.
John
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John Ackermann N8UR wrote:
Hal Murray wrote:
Not that I need one, but what's a ballpark price for one in working condition?
This is a broad range, but probably $1500-2500. A lot depends on the
condition of the tube.
I should qualify that my knowledge is based on private sales
Bob Kupiec said the following on 03/13/2006 02:07 PM:
I was wondering if any has written any time interval analysis tools
to run over GPIB from a HP/Agilent frequency counter? What I'd like
to do is automatically collect data to generate Allan Deviation and
Phase measurements over various
Brooke, don't know if this will be of any help as you're looking at your
4060 (and it may or may not be of any interest to the group as a whole)
but I'm about 15 days into what I hope will be long-term monitoring of
my two 5061As and one 5065A against GPS.
I'm using a setup that should be
The TAPR Reflock II board (designed by Luis Cupido) is shipping now and
will discipline a VCXO to 1pps, or to other frequencies. I'm traveling
now and don't have the exact URL handy, but www.tapr.org will have a link.
I've spoken with Luis about using the Reflock to synthesize an
appropriate
Hi Brooke --
Did you remove any linear offset before generating thorse plots? They
sure look a lot more like an Xtal aging with offset removed, than a Cs.
I wonder if it might be related to your use of the 1MHz output, rather
than 1pps, to drive the stop input. Maybe you're slipping cycles
Tim Shoppa said the following on 02/05/2006 05:05 PM:
I discover that I am in posession of a WJ-8716 which happens to have a
BNC on the back for an external 1MHz reference. I also have a Z3801A
that makes 10MHz. Is it as simple as turning the 10MHz PECL into TTL,
dividing by ten (e.g. 7490),
Allen Coates said the following on 01/27/2006 10:11 PM:
I am trying to select a host machine for a dedicated NTP server. I have
several spare PCs to hand, with processor speeds around 500 MHz - all my
budget will allow for the moment.
Initial experiments have been with Fedora core 4 and
Hi Rob --
Yes, that's too large to send through the list (with over 200
subscribers now, that adds up to a lot of bytes!). Best thing is to
host it somewhere for list members to download if they desire.
John
Rob Kimberley said the following on 01/21/2006 02:37 PM:
To all those wanting
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