Charismatic impedance, he?
Was that with one wire for data and the two neighboring wires as ground?
Didier KO4BB
Sent from my Droid Razr 4G LTE wireless tracker.
-Original Message-
From: Bob Camp li...@rtty.us
To: Discussion of precise time and frequency measurement
Hi
Yes, every other wire grounded. As you look at the connector all the pins on
one side are grounded.
Bob
On Oct 21, 2012, at 8:24 AM, shali...@gmail.com wrote:
Charismatic impedance, he?
Was that with one wire for data and the two neighboring wires as ground?
Didier KO4BB
Sent
On 10/21/2012 02:30 AM, Bob Camp wrote:
Hi
I do believe I can top that one :)
Back in the 70's (do I need to mention jobs …) these were already an
established item. Before that point (as in back in school … don't ask when that
was) I spent some time modeling the charismatic impedance of the
On 10/21/2012 02:29 PM, Bob Camp wrote:
Hi
Yes, every other wire grounded. As you look at the connector all the pins on
one side are grounded.
Look at your WD1003-WA2 ST-506 connectors for instance (old standard MFM
disk controller).
Cheers,
Magnus
Hi
Oh, you mean the new standard disk connector that came out long after the
RK-05.:)
Oddly enough my original look into the approach was based on a lot of that
will never work input from others.
Bob
On Oct 21, 2012, at 9:10 AM, Magnus Danielson mag...@rubidium.dyndns.org
wrote:
On
Dear Corby,
Good morning. Thank you for the detailed instructions to bring the 5065A close
to desired frequency. I couldn't have a cleaner explanation of the process.
Yesterday evening I tried adjusting the C field in small steps using a mixer,
lpf and two oscillators setup as my current
Dear Magnus,
Good morning. Welcome back! I hope you are enjoying typing at home again.
a. I just downloaded TimeLab. What a nice pice of software! Now I am ready for
some action.
b. Regarding your comment on the TBolt as a close UTC source, I just finished
my first approach for my thesis
Hi Edgardo --
One slightly frustrating thing about the 5065A is that its frequency
settability isn't as good as its short term stability. I believe the manual
says that the small divisions on the C-field counter dial are 2x10e12, and it's
hard to set closer than that.
A good 5065A is a
Sarah, Jim,
On 10/18/2012 02:26 AM, Jim Lux wrote:
On 10/17/12 4:48 PM, Sarah White wrote:
... Basically, this way I won't have to consider any waterproofing for
the antenna, and just hope that if lightning strikes it goes for the
exhaust vent dome thingy instead... Ah well whatever. My plan
Dear Magnus,
I hope you don't mind me jumping into the thread. Your last comment sparked my
enthusiasm and will to help. If you need me as a rookie to contribute or
coordinate with newcomers to Time Nuts, I will be more than glad to do it. Also
if you need help with the Wiki I could offer time
On Sun, 21 Oct 2012 18:02:40 +0200
Magnus Danielson mag...@rubidium.dyndns.org wrote:
Ah, but this is Time-Nuts.. are you sure you don't need 1E-13
performance? You may not think you do today, but inevitably, the
horrible uncertainty in your time stamps will gnaw at your innermost
soul,
Dear John,
Thank you for your kind comments. May I assume that a temperature controlled
environment for the 5065A is one similar to a data center with A/C? Or a room
without A/C but keeping a minimum temperature variation? Perhaps +/- 5º C/F?
My small lab shares the space with my ham shack. No
John
I agree with your observations. Before my time nuts time I did make the
mistake of getting rid of my 5065A since I did have a Shera disciplined FRK
and had gotten hold of quite a few HP5061A's and FTS 4000's. Big mistake.
Gave no attention to A/V. Phase noise yes but I went about it by
On 10/21/2012 12:39 PM, Attila Kinali wrote:
On Sun, 21 Oct 2012 18:02:40 +0200
Magnus Danielson mag...@rubidium.dyndns.org wrote:
Ah, but this is Time-Nuts.. are you sure you don't need 1E-13
performance? You may not think you do today, but inevitably, the
horrible uncertainty in your time
Dear Edgardo,
On 10/21/2012 05:50 PM, Edgardo Molina wrote:
Dear Magnus,
Good morning. Welcome back! I hope you are enjoying typing at home again.
a. I just downloaded TimeLab. What a nice pice of software! Now I am ready for
some action.
Great. Do enjoy.
b. Regarding your comment on the
On Sun, 21 Oct 2012 12:48:43 -0400
Sarah White kuze...@gmail.com wrote:
I would better appreciate that list of information if I confidently /
specifically knew how to access any of it. Any chance you have links to
the helpful information-type things you just listed? I feel almost
insulted by
On 10/21/2012 06:39 PM, Attila Kinali wrote:
On Sun, 21 Oct 2012 18:02:40 +0200
Magnus Danielsonmag...@rubidium.dyndns.org wrote:
Ah, but this is Time-Nuts.. are you sure you don't need 1E-13
performance? You may not think you do today, but inevitably, the
horrible uncertainty in your time
I started a small Wiki for the Plane Plotter program, using the free pbworks
site:
http://planeplotter.pbworks.com
The site is easy to use, and you can have multiple authors and as many
readers as you like. I could start a Wiki for Time Nuts, if you like, or
anyone else could start one of
Dear Sarah,
On 10/21/2012 06:48 PM, Sarah White wrote:
I would better appreciate that list of information if I confidently /
specifically knew how to access any of it. Any chance you have links to
the helpful information-type things you just listed? I feel almost
insulted by my ignorance right
On Sun, 21 Oct 2012 19:08:25 +0200
Magnus Danielson mag...@rubidium.dyndns.org wrote:
I'm happy to host the wiki myself, and I can set it up on two different
infrastructures.
That sounds like a good idea.
How about setting up a specific domain for this? Like time-nuts.org..
Uhm.. that's
If Magnus graciously offered to host the Wiki, I could also provide a mirror in
my company's infrastructure. The bigger and stronger the Wiki, the better.
Cheers!
Edgardo Molina
Dirección IPTEL
www.iptel.net.mx
T : 55 55 55202444
M : 04455 20501854
Piensa en Bits SA de CV
Información
On 10/21/2012 1:13 PM, Magnus Danielson wrote:
Dear Sarah,
On 10/21/2012 06:48 PM, Sarah White wrote:
I would better appreciate that list of information if I confidently /
specifically knew how to access any of it. Any chance you have links to
the helpful information-type things you just
I could start a Wiki for Time Nuts, if you like, or anyone else
could start one of course.
Don't forget that Didier already has a wiki for precision timing:
http://www.ko4bb.com/dokuwiki/doku.php
Best regards,
Charles
___
time-nuts
I have been able to learn quite a lot thru focused key word searches of the
mailing list archives.
http://www.mail-archive.com/time-nuts@febo.com/
Just for grins I tried the phrases Beginner Basic Question and FAQ and
got some usefull hits.
Before buying various pieces of gear searching the
On 10/21/2012 07:46 PM, Sarah White wrote:
On 10/21/2012 1:13 PM, Magnus Danielson wrote:
Dear Sarah,
On 10/21/2012 06:48 PM, Sarah White wrote:
I would better appreciate that list of information if I confidently /
specifically knew how to access any of it. Any chance you have links to
the
Hi All,
I have an HP 58503A and a Symmetricom 58503B which are behaving quite
differently to one another using a common antenna. Using Z38xx, there's
almost an order of magnitude difference between the reported ADEVs at
40k seconds (HP:7e-13, Sym:5e-12). Both have 10811 oscillators and are
It would be interesting to switch the A and B oscillators. The 10811 spec can
vary widely.
Thomas Knox
Date: Mon, 22 Oct 2012 07:21:08 +1000
From: dho...@gmail.com
To: time-nuts@febo.com
Subject: [time-nuts] GPSDO three cornered comparisons
Hi All,
I have an HP 58503A and a
Anybody in the middle of the country (Kansas City) have a maser or 5065a? I
want to test my super-charged gpsdo but don't have the tools.
Doc
KX0O
Sent from my iPad
On Oct 21, 2012, at 11:43 AM, ewkeh...@aol.com wrote:
John
I agree with your observations. Before my time nuts time I did
A bit OT, no way OT, but I found Bev as useful as tits on a boar hog.
Planeplotter was trying doing illegal memory acesses and Bev wouldn't provide a
copy of the program with debugging enabled.
Worse yet, after paying for the program, my credit card got hacked all over
France.
Planeplotter
I have an HP 58503A and a Symmetricom 58503B which are behaving quite
differently to one another using a common antenna. Using Z38xx, there's
almost an order of magnitude difference between the reported ADEVs at
40k seconds (HP:7e-13, Sym:5e-12). Both have 10811 oscillators and are
Where
Anybody in the middle of the country (Kansas City) have a maser or 5065a? I
want to test my super-charged gpsdo but don't have the tools.
Doc
KX0O
If not, for the cost of shipping, you're welcome to send it here for comparison
against my masers. Contact me off-list for details.
/tvb
Instead of Stable32, try Ulrich Bangerts plotter tool, it has a host of
stability analysis built in and is easier to use than Stable32 in my opinion.
Its also free.
Bye
Said
Sent From iPhone
On Oct 21, 2012, at 14:21, David Hooke dho...@gmail.com wrote:
Hi All,
I have an HP 58503A and a
Tom,
The ADEVs I quoted are from the Z83xx software, so I assume it's
comparing time from the GPS system to it's own oscillator's output, in
the same way that LH does. I've been monitoring the basic stuff you
suggested.
It's because I don't have a known reference to compare the units with
I try to keep the Time-Nuts intro page (www.leapsecond.com/time-nuts.htm)
current. If there are omissions, please let me know. If you are a newcomer to
the list, please see the resources there.
There is no shortage of information on the internet. In particular there are
some extremely good
Hi Edgardo,
What you'll find is that many labs do not periodically adjust the C-field of
their 5061A or 5065A at all.
Instead, any phase or frequency adjustment is done with phase microsteppers or
simply done in software with time and rate adjustments to the raw data. These
methods avoid all
David,
This is problematic, since the Z38xx software is not really measuring the
output of the GPSDO. Instead it's taking the internally reported PLL time error
measurements from the disciplining loop and pretending they are a measure of
real performance as measured against a real frequency
I would like a treatise on ti reported by gpsdo's.
Sent from my iPad
On Oct 21, 2012, at 7:39 PM, Tom Van Baak t...@leapsecond.com wrote:
David,
This is problematic, since the Z38xx software is not really measuring the
output of the GPSDO. Instead it's taking the internally reported PLL
t...@leapsecond.com said:
It doesn't often matter to me if that information resides on personal
servers, or a KO4BB wiki, or as occasional postings to the time-nuts mailing
list. Google does the work of finding it regardless. The key point is that
people take the time to document and share
While looking for other stuff I came across the data sheet for the NXP
Semi SAA6579.
The chip is a purpose built demodulator for RDS (which utilises a 57 KHz
ABPSK subcarrier on FM broadcast that is) used for traffic, song info
etc. This chip has an anti-aliasing front end low pass filter and
Hi Hal,
Good suggestions. Let me consider them.
BTW, the best time frequency glossary on the web so far is at:
http://tf.nist.gov/general/glossary.htm
There's also an index at:
http://tf.nist.gov/general/enc-index.htm
Another newcomer must-read is this excellent TF tutorial by NIST:
Because it use differential BPSK. I have a number of them and was trying
it. There is a test pin that might make it useful.
Regards
Paul
WB8TSL
On Sun, Oct 21, 2012 at 9:14 PM, Dale J. Robertson d...@nap-us.com wrote:
While looking for other stuff I came across the data sheet for the NXP
Semi
Hi Dale:
Is it as simple as changing the clock to operate at 60 kHz?
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Dale J. Robertson wrote:
While looking for other stuff I came across the data sheet for the NXP Semi
SAA6579.
The chip is a
Paul,
I'm trying to understand your reference to 'differential BPSK' all the RDS
references I've looked at indicate a 180 degree phase shift just like WWVB. I'm
thinking that differential and antipodal are just different words for the same
thing
Regards,
Dale
Sent from my iPhone
On Oct 21,
Jameco had them on sale for 20 cents each so I purchased some.
Moved the clock up frequency for 60 Khz and injected the 60Khz BPSK. (I
built a simulator) It did not track and in general produced noise. I
understand you can use 2 frequencies to drive it and I tried both from
synth gens.
I was
Paul,
Did you move the frequency up by driving it with a function generator or by
using a 4.56 or 9.12 MHz crystal? I'm thinking that maybe the quadrature phase
lock is accomplished by an internal varacter or some other mechanism for
'pulling' the on-chip oscillator. That wouldn't work if you
Dear Tom,
Good evening. In relation to your last comments on this and other subjects, I
am sharing some thoughts and experience about it. I took the liberty to
separate the topics as to ease the interested parties to follow up accordingly.
TNX.
a. Information you kindly provided and the
How about setting up a specific domain for this? Like time-nuts.org..
Uhm.. that's already taken.. by a certain TVB :-)
Tom: Would you mind if we would use [www|wiki].time-nuts.org for this purpose?
I can also provide DNS servers and other infrastructure if needed.
Attila Kinali
Yes, I
Three companies come to mind for phase microsteppers. A popular one decades ago
was made by Austron (model 2055A). I got mine on eBay but they are not as
common now as ten years ago.
The current models by Symmetricom and Spectra Dynamics are extremely high-end
(expensive) and overqualified for
Tom,
This is true for the phase data and calculating short term stability, but not
necessarily for measuring the tempco of the OCXO..
If we assume most GPSDOs have very stable DACs and DAC references (I have
measured typical DAC units to be at least 10x more stable than the best DOCXOs
over
Dear Tom,
I am documenting my experiences with the 5065A. Please count on me for that and
for sharing it. This week as I mentioned before, my measuring capabilities will
grow exponentially. Well at least for me and my sad current situation. I hope
soon, you will start seeing graphs and data as
I did this on a lark one day. 5065A - doubler block - tbolt Seemed to work
very well, but I didn't do any serious testing of it.
---
There's a third alternative as well. You might consider using your 5065A as the
LO in a GPSDO. This will sacrifice some short- and mid-term
Dear Tom and Mark,
Interesting suggestion Tom. Thank you. I will seriously consider it and for the
time being, put in on my wish list until I gather more specific information to
achieve it. Have you done it before? That could pave the road to success.
Mark. Do you have more specific
Trimble and HP took different approaches on their GPSDO's.
Trimble lets you get into things and fiddle around. HP is much more a black
box.
I have never seen anything that lets you fiddle' with one of the HP units.
Hi Bob,
I'm glad you asked. True, the Trimble TSIP binary command set lets
t...@leapsecond.com said:
BTW, the best time frequency glossary on the web so far is at:
http://tf.nist.gov/general/glossary.htm
There's also an index at:
http://tf.nist.gov/general/enc-index.htm
That's a good example of a point I didn't make last time...
Official sites like NIST
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