Hi Jim: I have one of the earlier versions of this instrument, along
with its companion signal generator. Although the software has some
annoying glitches at present, I've found it useful around the shop.
There;s a user group on Yahoo, and I think the factory is getting
ready to open the software
There is a yahoo group for the Signal Hound. For one user, the original
Signal Hound showed really poor phase noise performance with an external
reference with the internal reference always being better... see the
External ref vs internal ref.pdf document on the yahoo group for
details. The plot
Hi
We have one and I've used it. You have to be a bit careful reading the specs.
It does one set of things with an attached counter and another running as a
self contained box. The specs are correct, but you have to be careful about
which set the number on this or that page comes from.
Bob
Hello all.
Having spent some time working over the last year on GPS time stability
measurement, I'm keen to move onwards and upwards and have a go at
common-view time transfer. While my receivers are in the post, I have
thinking about my next direction. One thought that I have had is to try
Another update... I wanted to post more in the hopes that it may
help someone else with similar problems.
I told you about adding the simple voltage divider to reduce the
drive to the circuits following the replacement of the original
oscillator module. When I thought all was well I put the
Alan
You may suggest something to time nuts, looking at the response I doubt it
and ask my self why did three of us spend three weeks to fully check it out
and fix some of the code. Will reflect future projects.
Bert Kehren
In a message dated 4/12/2013 8:39:40 P.M. Eastern Daylight Time,
Hi Bert,
Just because there was not much response to this inquiry does not mean
that your efforts are not appreciated. Considering how many requested
the earlier code (many in person to myself) I expect your work is VERY
MUCH appreciated.
Thank you,
David
On 4/15/13 3:17 PM,
On 04/15/2013 10:00 PM, David McGaw wrote:
Hi Bert,
Just because there was not much response to this inquiry does not mean
that your efforts are not appreciated. Considering how many requested
the earlier code (many in person to myself) I expect your work is VERY
MUCH appreciated.
I for one
Hi Bert,
I do fully support David's opinion, I appreciate very much all the past
and future work on this subject like all other developments in the group,
so please don't stop, it made me happy when I got the code list in your
past mail!
Thank you very much,
regards,
Arnold, DK2WT
am
Lachlan,
This would be fun to try with a few sites involved. It requires a fairly
decent GPS and antenna at each location, and loging and then
post-processing. Would be fun to see how well it can be made to perform.
Cheers,
Magnus
On 04/15/2013 02:55 PM, Lachlan Gunn wrote:
Hello all.
On 04/15/13 04:39 AM, Jim Lux wrote:
Inexpensive USB spectrum analyzer.. http://www.signalhound.com/
It's not that inexpensive. I assembled a 22 GHz spectrum analyzer based on the
HP 7 modular measurement system for about the same money. The 22 Ghz
tracking generator module is very
Hi
One common requirement is a receiver that will give you per satellite
information that you can turn into time. About the only way around that is to
pre-determine a set of sats and flag the rest as do not use. With the second
approach, various geometric issues can get a bit exciting. Either
I'd be interested in understanding what it would take to participate in this
type of experiment. I'm unlikely to have any free time for this over the next
several months but if for example there was a particular GPS receiver that was
well suited for this type of work that would be useful
Ok Bert I will stick my head above the parapet and repeat that
query.Sometimes it is frustarting the get no response, but later get
personal appreciation as you meet individuals. I didn't know the guy. I was
trying with a friend to contact him long after the original article. We were
Bert I am grateful for the work you and friends have done.
Is there any way we can add our names to some expression of thanks from
members of the Group to his widow Karen and her helpers for their work in
making the checked source code for the GPSDO available to us and maybe leave
a token of
The online obit at
http://www.santafefuneraloption.com/sitemaker/sites/santaf0/obit.cgi?user=949646Shera
says,
Memorials may be made to the University of Chicago Laboratory Schools,
the Sierra Club, or any organization of the Donor’s choice.
University of Chicago Laboratory Schools
My inclination is that one would need three things to participate in such a
system---
1. A GPS receiver.
2. A local reference oscillator.
3. A way to measure their relative phase.
I understand that the Thunderbolt can perform all of these functions, so expect
that this would be the
Hi
Unfortunately there's more to it than that. Unless both TBolts are looking at
the same sats, they will get very different answers. Ideally you want to
compare single sats, and have very precise station locations. That lets you
eliminate a lot of geometric stuff and individual sat errors.
Near the bottom of this is a bit on the UC lab school.
Engineering is the art of making what you want from what you can get at a
profit.
From: time-nuts-requ...@febo.com time-nuts-requ...@febo.com
To: time-nuts@febo.com
Sent: Tuesday, April 16, 2013
Hello.
I'm starting with a Resolution T, which claims to offer a single-satellite
mode. I gather that it's not an amazing receiver, but I'm hoping it will be
good enough for a first foray at least. I'm rather hoping that it will do
well, though, since it would mean a cheapish way of making a
lach...@twopif.net said:
I'm starting with a Resolution T, which claims to offer a single-satellite
mode. I gather that it's not an amazing receiver, but I'm hoping it will be
good enough for a first foray at least. I'm rather hoping that it will do
well, though, since it would mean a
Bert,
As one of Brooks customers I would like to express my thanks to him
for his generous work (fortunately I did it when we contacted in early
2009), and also now to thank you and the others who made possible to
finally have his code, including the efforts to fix and test it.
And of course
On 4/15/13 1:48 PM, Dr. David Kirkby wrote:
On 04/15/13 04:39 AM, Jim Lux wrote:
Inexpensive USB spectrum analyzer.. http://www.signalhound.com/
It's not that inexpensive. I assembled a 22 GHz spectrum analyzer based
on the HP 7 modular measurement system for about the same money.
New
I too would be interested. The topic of common view GPS comes up every now and
then. The incentive to use common view time transfer (CVTT) is reduced when
plain old time transfer (TT) is so good already. Still, it's worth a try.
I'd be curious what level of improvement is possible. It will
On Mon, Apr 15, 2013 at 8:23 PM, Tom Van Baak t...@leapsecond.com wrote:
I'd be curious what level of improvement is possible. It will depend on the
receiver and the antenna. I believe the NIST project uses fancy antennas
but normal M12 receivers. So there's hope for the amateur.
The M12 is
On 4/15/13 8:36 PM, Chris Albertson wrote:
On Mon, Apr 15, 2013 at 8:23 PM, Tom Van Baak t...@leapsecond.com wrote:
I'd be curious what level of improvement is possible. It will depend on the
receiver and the antenna. I believe the NIST project uses fancy antennas
but normal M12 receivers. So
but what is a fancy antenna? How are they different from a normal timing
antena?
Google for: NIST SIM GPS common view pinwheel
/tvb
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On 4/15/13 9:27 PM, Tom Van Baak wrote:
NIST SIM GPS common view pinwheel
described in one of the NIST reports as an aperture coupled slot fed
array that is better than a patch, but not as large and heavy as a choke
ring.
W. Kunysz, 2000, “High Performance GPS Pinwheel Antenna,” in
Chris,
Chokering is not needed. Measured quality antennas are listed at
http://www.ngs.noaa.gov/ANTCAL/
Or at
http://www.geopp.de/index.php?sprachauswahl=enbereich=0kategorie=34artikel=62
/Björn
Originalmeddelande
Från: Chris Albertson
On 4/15/13 10:22 PM, Jim Lux wrote:
On 4/15/13 9:27 PM, Tom Van Baak wrote:
NIST SIM GPS common view pinwheel
described in one of the NIST reports as an aperture coupled slot fed
array that is better than a patch, but not as large and heavy as a choke
ring.
W. Kunysz, 2000, “High
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