It's interesting that this is the same discussion the ham radio
community has been having for years now, as we've seen the kids that
used to become hams diverted to computer-based activities.
While I don't personally have a great talent for bringing youngsters in,
I'm happy that organizations
Hi Mike --
I can't speak for John, but I'd sure find that program useful.
73,
John
Mike Feher said the following on 01/02/2006 08:10 AM:
John -
I wrote a program about 20 years ago to calculate the total integrated noise
power from the individual power spectrum density points. It is
-
Do you also need GW Basic? I'll FTP the programs and send the URL shortly.
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 N8UR
Sent: Monday
I have CHU at http://www.febo.com/time-freq/leapsecond-2005 (about
halfway down the page).
John
Warner Losh said the following on 01/02/2006 12:29 PM:
Greetings,
A friend at work has the following recordings available over the leap
second, and will post them if there's interest.
Thanks, Mike. I can work with that.
73,
John
Mike Feher said the following on 01/02/2006 08:26 PM:
The URL below is the source code in Basic for the program that I wrote over
20 years ago. Since I think you both intend to change it to another language
the listing should suffice. I have
Newell said the following on 01/02/2006 09:24 PM:
At 12:21 PM 1/1/2006 -0500, John Ackermann N8UR wrote:
I've wrapped a web page around my data, with photos of the Spectracom
non-event :-) and some other info.
http://www.febo.com/time-freq/leapsecond-2005.
Any chance of getting a few more
John Ackermann N8UR said the following on 01/02/2006 09:43 PM:
I've put the full 2-hour run of WWVB at
http://www.febo.com/time-freq/leapsecond-2005/WWVB-full.mp3 (7MB) and
http://www.febo.com/time-freq/leapsecond-2005/WWVB-ful.wav (115MB).
Sorry about the typo -- the second URL should
Bill Beam said the following on 12/31/2005 11:45 PM:
I have since compared UT+ raw data with TAC32 display
as follows:
UT+ raw data TAC32 display
12/31/05 23:59:59 same
12/31/05 23:59:60 1/1/06 00:00:00
12/31/05 23:59:60 1/1/06 00:00:01
1/1/2006 00:00:00
I've wrapped a web page around my data, with photos of the Spectracom
non-event :-) and some other info.
http://www.febo.com/time-freq/leapsecond-2005.
Happy New Year!
John
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You can pop the corks now -- only the mundanes wait for local time.
I had pretty good success with the recordings -- I have audio of WWVB,
CHU, and WWV on both 5 and 10MHz. I also have data logs from the
Spectracom 8170 WWVB receiver and Z3801A, as well as a dump of the
system time on a Linux
Here's what the Spectracom 8170 did:
53736.00273 001 00:03:57 TZ=00
53736.00274 001 00:03:58 TZ=00
53736.00275 001 00:03:59 TZ=00
53736.00277 001 00:03:59 TZ=00
53736.00278 001 00:04:00 TZ=00
53736.00279 001 00:04:01 TZ=00
53736.00280 001 00:04:02 TZ=00
53736.00281 001 00:04:03 TZ=00
It
Looks like the Z3801A did just what it was supposed to, other than
taking an extra second for the leapsecond bit to clear:
53735.3 T22005123123595530+003F
53735.4 T22005123123595630+0040
53735.5 T22005123123595730+0041
53735.7 T22005123123595830+0042
53735.8
I'll turn this into a proper web page tomorrow, but I've uploaded .wav
and .mp3 files of WWVB, CHU, WWV-5MHz, and WWV-10MHz as well as data
logs of the Spectracom 8170, Z3801A, and Linux system time (from the
program posted on the NTP list earlier today). All are cut down to show
about one minute
Hope everyone's getting ready for the big event.
If all goes well, I'll be recording serial streams from a Z3801A GPS and
a Spectracom 8170 WWVB clock. I'll also be recording audio from WWVB on
60kHz, CHU on 3390kHz, and if things work out, WWV on 5 or 10MHz (I have
a tested setup for recording
Hi Allan --
The HP-107 had some of its electronics in the antenna unit; there's an
amplifier (or two) in there that provides much of the system gain. Tom
Van Baak has schematics of the antenna unit at his leapsecond.com site
-- not sure what the URL is, but look at
in one of these kits.
Garren
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of John Ackermann N8UR
Sent: Thursday, December 22, 2005 2:27 PM
To: Discussion of precise time and frequency measurement;
[EMAIL PROTECTED]; tacgps@lists.tapr.org
Subject: [time-nuts
Poul-Henning Kamp wrote:
I am trying to get data collected from as many time sources as
possible across the leapsecond on new years eve/day, and I would
appreciate if you guys could help me out.
The idea is to create a free public repository of data which can be used
to test computers and
We've been getting more and more messages submitted from addresses not
subscribed to the list. The vast majority of them are spam, and it's
becoming time consuming to go in and delete them.
So, effective shortly I'm going to change the list configuration to
discard posts from non-subscribers
David G. Andersen wrote:
This is great, John - thanks for designing it.
Isn't that MAX477 convenient? :) The only drawback to it, from my
view, is that it's got too much bandwidth from all those weird video
applications (who wants video when you can play with 10Mhz GPSDOs?),
leading to the
TAPR is pleased to announce the immediate availability of the TADD-1 RF
Distribution Amplifier kit.
The TADD-1 is a six channel RF distribution amplifier. Its primary use
is to allow a single frequency source (e.g., a GPS disciplined
oscillator) to drive the external reference input of
I wonder if anyone on the list has an HP programming note for the 8566
series spectrum analyzer numbered 5954-2754. It is referenced in an HP
Spectrum Analysis presentation and includes the listing for a
downloadable program (DLP) to do AM modulation characterization via FFT.
I'd like to try
Does anyone know anything about the high-stability oscillator (option
01) in the HP 8920A/B service monitor?
I am pretty sure that it's not a 10811A as there isn't enough room in
the card cage for something that size.
I'm asking because I was very pleasantly surprised today when I did a
Thanks! Actually, through some friends I indirectly know a couple of
the folks who worked on the 8920, but thought I'd try the time-nuts
first on the off-chance.
Thanks!
John
Had said the following on 10/29/2005 06:56 PM:
Hi John,
The 8920 family was designed and built at HP's
Stephan Sandenbergh wrote:
I wondered if anyone could help me with an interfacing problem? I guess
that it is a trivial question to those that know, but I am rather
puzzled by it.
My very stable OCXO output a 8dBm (50ohm) sine wave. How is this signal
converted/interfaced to a logic standard
;
}
Sleep(10);
if (kbhit())
{
getch();
printf(GPIB wait for SRQ interrupted!\n);
exit(1);
}
}
}
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of John Ackermann N8UR
Sent: Friday, September 09, 2005 6:53 PM
Tom Van Baak wrote:
SRQ is definitely a pain, but is hard to do without if you're doing
anything with multiple instruments on the bus; my current problem is
trying to read frequency from a 5370A and voltage from the 3456A to plot
VCO performance. Without the SRQ, I'm getting missing voltmeter
John Miles wrote:
Interesting; I hadn't run across that. The examples in the manuals commonly
show multiple commands in a single string; maybe the old-school BASIC
controllers were smart enough to pause briefly after transmitting semicolons
or string terminators...?
-- john, KE5FX
You can
Poul-Henning Kamp wrote:
In message [EMAIL PROTECTED], John Ackermann N8UR writes:
In theory, the bus is supposed
to handshake to avoid that problem, but that's not always reliable on
the older instruments -- they will report that they're ready for another
command when in fact they aren't
Poul-Henning Kamp wrote:
In message [EMAIL PROTECTED], Magnus Danielson write
s:
I think I have the uPD7210 datasheet lying around here if you still need it,
even for verification.
I would love to. I haven't been able to track one down and ended up
using a summary condensed into a
For a while, I've had two web pages with specs on various frequency
standards and synthesizers of interest to our community. I've combined
the two pages and added some additional info. The new page is at:
http://www.febo.com/time-freq/hardware/specs.html.
If you have info on additional
Ackermann N8UR wrote:
For a while, I've had two web pages with specs on various frequency
standards and synthesizers of interest to our community. I've combined
the two pages and added some additional info. The new page is at:
http://www.febo.com/time-freq/hardware/specs.html.
If you have info
Yes, thanks, Bdale. I didn't catch that. It's fixed.
73,
John
Bdale Garbee wrote:
On Sat, 2005-09-03 at 14:59 -0400, John Ackermann N8UR wrote:
For a while, I've had two web pages with specs on various frequency
standards and synthesizers of interest to our community. I've combined
Alberto di Bene wrote:
Alberto di Bene wrote:
P.S. Let me please test how this reflector behaves when sending HTML
messages... I have noticed a strange behavior in the past... it
insists on reformatting
the HTML message at its will...
Here following there should be an image... let's see
Folks, I'm getting more and more apparently valid postings from
unsubscribed email addresses. These are held until I manually review
and approve them, which (a) is a pain for me, and (b), as a result of
(a) may not happen very quickly.
The listserver will only accept postings from addresses that
Tom Van Baak wrote:
While I get to preview UTC New Years or leap
seconds at 4 PM PST here in Seattle (UTC-8),
there's a billion people in China (UTC+8) that
have to wait until 8 AM on Jan 1.
Slightly off-topic, but this brings back memories of Y2K. I was on our
company's SWAT team (There's a
Tom Van Baak wrote:
Slightly off-topic, but this brings back memories of Y2K. I was on our
company's SWAT team (There's a software bug! Quick, call the
lawyers!) and spent 24 hours in our command center ringing in the new
year around the world. The first big test was when New Zealand turned
Poul-Henning Kamp wrote:
In message [EMAIL PROTECTED], John Ackermann N8UR writes:
The first big test was when New Zealand turned
over, and we had a guy standing in front of an ATM to do a test
transaction ASAP. Fortunately, it worked. :-)
Did he get to keep the money?
I think it was his
Brooke Clarke wrote:
Hi:
Steven Bible says the Reflock II might be available in September 2005,
see: http://gref.cfn.ist.utl.pt/cupido/reflock.html
Have Fun,
Brooke Clarke, N6GCE
I've kept fairly quiet about the Reflock II until we have more concrete
details, but as Brooke mentioned
to register and have at it, feel free.
John
David Andersen wrote:
How about just letting it be editable by everyone, at least until it
becomes a problem to do so?
(I was going to toss in the start of a Manuals page.)
-Dave
On Jul 28, 2005, at 9:29 AM, John Ackermann N8UR wrote:
I've set
the febo.com stuff is
self-hosted and I use my ISP (Roadrunner) purely for bandwidth -- all
the mail, web, ftp and other services run on a bunch of Linux machines
in my basement.
John
David Kirkby wrote:
John Ackermann N8UR wrote:
I've set up a wiki at http://www.febo.com/time-nuts (I want
[EMAIL PROTECTED] wrote:
Hi,
I managed to find a copy of the Cable Delay App Note
somebody asked about not too long ago. Should I have
John Ackermann post it on his site ... or Tom Van Baak
on his site? Any takers? :-) It is in .pdf format.
I'll be happy to host it.
John
The front page of today's Wall Street Journal has an article about the
debate. The headline is Why the US wants to End the Link Between Time
and Sun.
Unfortunately, I don't get the electronic edition so can't cut-and paste.
From the article, it appears the USNO was the author of the
Tom Van Baak wrote:
You know, if the stackable TAPR module
project catches on another PCB on the list
could be a mains frequency monitor.
It would robustly filter and divide the 50/60 Hz
mains frequency to 1 PPS and then onboard
compare that 1 PPS against the local (OCXO,
atomic, or GPS) 1 PPS
Mike S wrote:
At 02:40 AM 7/28/2005, M. Warner Losh wrote...
The Turin leap second survey said that loss of life had occurred due
to a leap second insertion event.
That is a deliberately misleading statement. It MUST be the case that the loss
of life occurred due to and improperly
I've set up a wiki at http://www.febo.com/time-nuts (I want to change
that to /wiki/time-nuts, but at the moment that doesn't seem to work).
There's presently no content there beyond a simple introduction.
Would someone (or multiple someones) here be willing to do some initial
structure and
Tom Van Baak wrote:
Hi Lymex,
A DBM is a standard RF component, so I
don't think it's something you would build.
HP made them years ago (HP 10514A) and
companies like Mini-Circuits still do; in great
variety and quantity. See, for example:
http://www.minicircuits.com/dg03-102.pdf
Tom Van Baak wrote:
Dear Tom Van Baak,
Sorry to bother you in this way but I cannot get registered on time-nuts
mailing list.
Thanks for the mail. Very pleased to meet you.
I'll cc time-nuts and John can add you to our
list manually.
Hi Lymex --
Welcome to time-nuts!
I've added you to
[EMAIL PROTECTED] wrote:
Is anyone familiar with the Efratom model FRS-C rubidium? I am trying to
find out if there is a published spec for jitter on it.
If it isn't available, does anyone have one of these units and knows
what it typically runs on theirs?
Thanks, Chuck Norton
Hi Chuck --
I
Joseph Gray wrote:
Re the Rolex -- I feel compelled to let the list know that all the
servers at febo.com run ntp, and look to my (at the moment) two stratum
1 servers -- one gets its time from a Z3801A GPSDO, while the other uses
both a Z3801A and a Spectracom WWVB receiver. I just checked,
Poul-Henning Kamp wrote:
Actually, that is not the case.
Postfix is far superior to sendmail when it comes to maillists.
At one point when sendmail was reenabled by accident in the FreeBSD
mailsystem, it got four hours behind in 15 minutes.
I'm using Exim, which is the standard MTA in
Jim Miller wrote:
Another (probably crazy) thought came to mind... I wonder if the
GNURadio can be used to demodulate signals at L1 either directly or
through a downconverter/LNB.. We could make a software defined GPS
receiver - a GNUGPS! Twiddling the software could make it support
Joseph Gray wrote:
I have noticed that this list seems to send emails out of sequence. I
have seen other instances of this, but the two messages I just sent in
response to the HP 5060A query arrived in reverse order and show time
stamps 30 minutes apart. I sent my replies to the list about
Rob Seaman wrote:
Hi,
John Ackermann says:
By the way -- Rob's message was held as a non-member submission
which I approved. Unless he's subscribed to the list in the
meantime, he won't see any responses unless you separately cc him.
Thanks for approving the message - it wasn't clear
Magnus Danielson wrote:
Yes, I've noticed all the links, software and all that. Being a *nix guy I
naturally care to have the source and control.
You're welcome to my Perl stuff -- not sure if I have it on my website
under http://www.febo.com/time-freq/gps (look for the Z3801A link) but
if
Hi Matt --
I have a perl script, based on some code from Tom Van Baak, that does
basic AVAR stuff. Poul-Henning Kemp has posted some C code to do the
same thing -- you might take a look at the list archive to find that
(https://www.febo.com/pipermail/time-nuts).
John
Matt Ettus wrote:
Magnus Danielson wrote:
Hi Folks!
Well, lacking a GPS receiver I see that they (HP Z3801A) seem to be readilly
available for fairly good price. It also seems popular in the community.
What do you think? Should I get one?
Having a RS Rubidium running, a few HP 10811 (usually turned off) in
Hi Ulich --
Just at first glance, WOW! That sounds like a great design. There are
others here who can give you a much more detailed technical critique,
but I certainly think you have a pretty great idea there.
You might also consider a sub-project that would just be the TIC
component... a
Hi All --
I'm working on a new project for TAPR that some of you may be interested
in, and I'm soliciting your input, as well as three or four of you to be
beta testers.
By way of background, TAPR (http://www.tapr.org) is an international ham
radio organization that supports advanced RD
Folks, I hesitate to do this, but I think this topic has gone on long
enough and we're not shedding much new light. Let's give it a rest
Thanks,
John
Yr Humble Listmanager
___
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time-nuts@febo.com
David Kirkby wrote:
As you possibly know, I have copied the manual for the 5370B and will
make it available on CD to anyone for the cost of postage. (But for
now, anyone who wants to proof read it, to check for errors such as
missing pages, can take a look. Drop me an email).
This manual is
Randy Warner wrote:
John,
Reset is really about the only way to do it unless you can see what messages
are coming out and disable them one at a time. If you have LOTS of time you
can just cycle through all the messages and shut them off, but resetting is
probably the easiest thing to do.
David Kirkby wrote:
Can one chose as an option on the list's configuration not to download
attachments?
I just looked at the subscriber options, and unfortunately that's not an
option.
John
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David Kirkby wrote:
Can anyone tell me the difference between the two above oscillators? I
have the manual for the 97page manual (page 2 is upside down), but it
does not mention the latter.
However, I think I have seen a small couple of page document somewhere
which listed the 10811-60111 as
This is very odd (I seem to be collecting these sorts of problems) and I
wonder if anyone else has seen something similar.
I got my 5061A trimmed to the point where a 5 day run against GPS showed
an offset of less than 1x10e-13. I then switched the unit into the long
time constant mode and
] [mailto:[EMAIL PROTECTED] Im
Auftrag von John Ackermann N8UR
Gesendet: Sonntag, 27. März 2005 04:17
An: time-nuts
Betreff: Re: [time-nuts] Strange effect with C-Field change -- and a bit
ofdata
I did some testing today and I think that strange effect I saw was in
fact a cable problem -- I couldn't
I did some testing today and I think that strange effect I saw was in
fact a cable problem -- I couldn't reproduce exactly the same effect,
but in gently wiggling one of the cables to the counter I was able to
get some oddball readings.
A couple of unrelated points -- I wasn't sure about this,
While I was out of town for the last week, I continued an experiment to
check the C-field sensitivity of my 5061A. I measured the offset at
C-field settings of 5.00, 5.50, and 4.50.
The last change was made while I was out of town. My wife, Jody, made
the change from 5.50 down to 4.50. She
Hubert v. Bonhorst wrote:
Hi John,
I saw similar outliers running especially Motorola GPS receivers in the
vicinity to mobile telephones. Shielding is not sufficient. What I see in
your data plot is a drifting oscillator until the receiver tries to find a
new satellite configuration. (sudden jump
All --
Thanks for all the comments. It must be a slow afternoon/evening!!!
You've given me several things to check out. In addition, as I was
looking at the hardware in the basement I now have a suspicion that it
might be a cable problem, specifically in the cable that goes from the
5061A PPS
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