You are correct, the 'mus' refers to microseconds.
I think most English (American?) speakers would recognize us as microseconds
and get confused by mus. (I know I was confused, but that was only a quick
glance.)
There is an interesting tangle here. If you use a fancy font so you can use
On Thu, Dec 13, 2012 at 5:23 AM, Matt Davis m...@synclab.org wrote:
Hey time-legumes, I figured a few of you all might be interested in some of
the
work that the team and I have been doing. We recently acquired a couple of
RaspberryPis, and out of curiosity, we wanted to see how well our
Suppose I want to compare the PPS outputs of 2 GPS units. The problem is
that I don't know which one will happen first.
If I feed them into the start/stop inputs of a typical timer/freq box, I
don't know which is which. If I get them wrong, the answer will be
0.99xx seconds rather than
Hi John,
I'm running TimeLab with a Quartzlock A7 which multiplies frequency /
phase differences in a similar way, and a HP 5370B counter. With the A7
running in TI mode, the multiplying factor is 1E-4 and works as
expected. I measured only stable sources that don't wrap phase within a
few
They make frequency difference meters. I never used one, but it seems to me a
frequency difference meter would just use the two input signals to toggle up
and down respectively on a counter, then display the result over a fixed period.
Would this do what you want?
--Original Message--
Hi
The easy way to take care of the problem is to program one of them with a cable
delay of around 500 ns. The GPS should not be outside +/-100 ns, so that's
plenty of room for a start / stop to occur. Of course that assumes that the GPS
has a programable cable delay setting.
A 500 foot
Hi
Shouldn't mus be mili-micro seconds? :)
If you go back far enough you will indeed find gear calibrated in mu (mili
micro) and uu (micro micro) seconds. I've been doing this for quite a while
and that was well before my time….
Bob
On Dec 12, 2012, at 11:33 PM, Matt Davis
Bob, timenutters
here are the first results, hope
I'm not boring the members with these
posts, for most participants these
are basic things.
Now I'm trying to understand if the
setup is working or I have to modify
some things.
The logging is at 47000 samples and going,
the script is working well
I used to have some ancient microwave stuff that was marked in kMc/s
rather than GHz.
On Thu, Dec 13, 2012 at 6:55 PM, Bob Camp li...@rtty.us wrote:
Hi
Shouldn't mus be mili-micro seconds? :)
If you go back far enough you will indeed find gear calibrated in mu (mili
micro) and uu (micro
Hi
Ok, those plots look much more real. Thanks for sharing.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Fabio Eboli
Sent: Thursday, December 13, 2012 7:58 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] MT3339 PA6H and
On and off I have been receiving error messages from various pieces of
equipment about NTP errors from my pool of Symmetricom receivers. I finally
found NTPTool at:
http://www.geardownload.com/internet/ntp-server-tool-download.html
(Click on the blue download image above the thumbnail image
Yes, this is the typical GPS receiver PPS wander. It is usable for a GPSDO
as it seems of timing quality (the Motorola M12M is -20nS..+20nS over 10
days).
See:
http://www.jackson-labs.com/assets/uploads/main/Motorola_M12.pdf
on page 7.
On Thu, Dec 13, 2012 at 2:47 PM, Bob Camp li...@rtty.us
If the trailing edge of one of the pulses is reliable, you could
measure from the starting edge of one pulse to the trailing edge of
the other pulse.
It is not impossible to make an adjustable but accurate pulse delay
using a comparator or maybe a gate. How accurate does your
measurement need to
Hi Hal,
This happens to me too. The solution I usually use is to adjust the cable delay
parameter. I find it convenient sometimes to advance the 1PPS by 1 microsecond.
Kind of like at the tone, the time will be, rather than at the tone, the
time was. Give up on at the tone, the time is.
The
The indicated delay box is an unpowered device intended for timing composite
video and fine-tuning for color burst phase match. As such they are analog in
and out, require / expect defined source and load impedances (typically 75
Ohms), are slightly lossy, and 100% passive. I suspect they are
The Synergy SSR-T6R timing GPS is indeed available for $35 on a one off
basis. Shipping is about $10. The very best way to order is from:
Gina Aspeytia
Marketing Sales
Synergy Systems, LLC
P.O. Box 262250, San Diego, CA 92196 USA
Direct (858) 577-3507 Voice (858) 566-0666
Fax (858) 566-0768
On Dec 13, 2012, at 4:57 AM, Hal Murray hmur...@megapathdsl.net wrote:
Suppose I want to compare the PPS outputs of 2 GPS units. The problem is
that I don't know which one will happen first.
If I feed them into the start/stop inputs of a typical timer/freq box, I
don't know which is which.
On Fri, 14 Dec 2012 00:06:15 +0100, timen...@triplespark.net wrote:
On Dec 13, 2012, at 4:57 AM, Hal Murray hmur...@megapathdsl.net wrote:
Suppose I want to compare the PPS outputs of 2 GPS units. The problem is
that I don't know which one will happen first.
If I feed them into the
Hi anonymous,
the 53132A only does that for a couple of nanoseconds. Then it jumps to a
stupid value such as:
0.004 us
-0.002 us
0.999,999,993 s
It get's even better when the counter decides it doesn't have enough
resolution in frequency mode:
2,3** u
Absolutely horrible to parse,
Hi all!
Following pieces excess to my needs:
National Insturments gpib-enet 50$ plus shipping
- serial 35$
Package for gpsdo
Moto m12+t
Built Shera controller. detail pics on request. Working.
10811a-6011
mmcx to n adapter
hp gps splitter 2 port
Non linear systems meter for efc voltage
gps patch
If you are curious about how the B-1B bomber sets its time reference, go to
www.fbo.gov
and search for
F1S0AF2321B001
in the box next to keyword.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
It's quite amusing that they decided to redact the quantity and unit price
from the sole source letter - but the other document says we are going to
buy 14 of these - sort of makes you wonder why they bothered...
On Fri, Dec 14, 2012 at 9:26 AM, gary li...@lazygranch.com wrote:
If you are
They routinely redact stuff in the awards. Usually the names of the individuals
that picked the vendor. It is a silly game since you can and do FOIA much of
the redacted information if you lost the bid.
Some of the crypto comm schemes need time of day to work. Usually the pilot
will say give
The gpib-enet has been spoken for.
I'll take offers on the gpsdo kit or parts of it.
On Thu, Dec 13, 2012 at 7:35 PM, Lizeth Norman normanliz...@gmail.com wrote:
Hi all!
Following pieces excess to my needs:
National Insturments gpib-enet 50$ plus shipping
- serial 35$
Package for gpsdo
One of the very first time related projects I was involved in was for
synchronizing radios - this was when they were retrofitting HAVE QUICK to
the AN/ARC-164 and wanted a cheap, portable source of TOD data - the GPS
was a 2-Channel Magnavox unit (C/A code only) and they also did the
firmware
From: Don Latham
Sent: Thursday, December 13, 2012 9:26 PM
To: time nuts
Subject: [time-nuts] Synergy SSR-6TR
The Synergy SSR-T6R timing GPS is indeed available for $35 on a one off
basis. Shipping is about $10. The very best way to order is from:
Gina Aspeytia
[]
However, the cheapest
Hi Said,
the 53132A only does that for a couple of nanoseconds. Then it jumps to a
stupid value such as:
0.004 us
-0.002 us
0.999,999,993 s
It looks like you were measuring a 1PPS pulse that was very close to the 1PPS
reference. As Hal noted when he started this thread, this is tricky.
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