Bert,
I certainly appreciate all the work that has gone into the latest code. I
learnt a lot from Brook's original (1.33) and modified it to suit my 'peculiar'
hardware. I've only had time for a short look at the latest but I'm sure there
is MUCH to learn here too. A very well written program wi
Thanks to all concerned it is a fitting memorial to him and his family.
Regards
Geoffrey Smith
Mobile: 0412 299 922
E-Mail geoffsmit...@tpg.com.au
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> I wonder if one should only measure the PPS thought. Looking directly at
> the clock could help to separate the clock drift and the time, even if
> you get sufficient clues from the PPS and sawtooth correction.
>
> Cheers,
> Magnus
I've never tried that. Start with checking the ADEV of the LO
Hmmm, apostrophe slip - apologies to any grammar-nuts amongst the
time-nuts..
regards,
Paul R
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of REEVES Paul
Sent: 16 April 2013 08:07
To: Discussion of precise time and frequency meas
In message , "Tom Van Baak" writes:
>When you look at the actual clock solutions (which are in the @@Hn
>message) you will be surprised at the variance.
A lot of that variance is because the position-hold coords are wrong.
I tried using the @@Hn data to "sneak" up on the right coords and got
so
Hi Bert,
Thanks for yours and Bob Leichner's time and others for this release. I
bought what was the latest version with AutoN from Brooks in 2010 but will
program a PIC with what you have released to see if there are any
significant differences.
Also a big thank you to Karen her permission
Count me in as well, if you need another participating station. I have
my Thunderbolt running 24/7 with a solid stationary antenna..
Achim
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"is one better off just taking the simple route and tracking GPS time
directly?"
My response is Yes, as long as you use the GPS to discipline a good
Oscillator.
GPS on its own is generally capable of about 10 ns of phase error, pretty
much over any time period.
So the longer you average the
Hi Poul:
Once you know the rise and set times (where the signal is stable) in sidereal time for each SV# you can simply
enable/disable them based on time.
I think this may be a better approach than having a mask angle based on each
degree of azimuth.
Keeping track of a rise and set time for ea
Just curious what would a typical use case for this network be ? My limited
understanding of common view GPS in this context is that it can be used for
time (and frequency) transfer between labs.
Thanks in advance for any replies.
Regards
Mark Spencer
--
Messag
On Mon, 15 Apr 2013 23:00:49 -0700
Jim Lux wrote:
> the effect of a strong multipath (which is what the choke ring
> suppresses) would be a LOT bigger than that..
Uhmm.. to my understanding, this is not quite true.
The choke ring does not surpress general multipath, but
the waves from near and
Hi
Most modern receivers give you corrections in ps rather than ns. That's not to
say they are *good* to 1 ps. It's not uncommon to see adev (after doing the
correction) running sub 1 ns at one second when compared to a 5071.
Most people seem to do this in runs many minutes long. That's a bit
Hi Tom,
On 04/16/2013 09:42 AM, Tom Van Baak wrote:
I wonder if one should only measure the PPS thought. Looking directly at
the clock could help to separate the clock drift and the time, even if
you get sufficient clues from the PPS and sawtooth correction.
Cheers,
Magnus
I've never tried th
On 04/16/2013 09:55 AM, Poul-Henning Kamp wrote:
In message, "Tom Van Baak" writes:
When you look at the actual clock solutions (which are in the @@Hn
message) you will be surprised at the variance.
A lot of that variance is because the position-hold coords are wrong.
I tried using the @@Hn
On 04/16/2013 08:04 PM, Attila Kinali wrote:
On Mon, 15 Apr 2013 23:00:49 -0700
Jim Lux wrote:
the effect of a strong multipath (which is what the choke ring
suppresses) would be a LOT bigger than that..
Uhmm.. to my understanding, this is not quite true.
The choke ring does not surpress gen
On 4/16/2013 9:53 AM, Achim Vollhardt wrote:
> Count me in as well, if you need another participating station. I have
> my Thunderbolt running 24/7 with a solid stationary antenna..
I'm not sure what all I'll need to participate, but I'd like to
volunteer my thunderbolt to this sort of network as
On 4/16/2013 1:55 AM, Jim Lux wrote:
> 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 c
Dear Fellows,
I recently purchased a pair of Z3805A off eBay seller tommy_chou.
I have fired them up with a MaxRad 26db timing antenna attached to each.
The antennae have a clear view of most of the sky.
The receivers are having no problems seeing enough satellites.
The problem I am seeing on b
On 4/14/2013 7:48 AM, Brian Davis wrote:
Not sure if it's already been mentioned, but Linear has introduced a new
part that looks interesting :
LTC6957 Low Phase Noise Buffer/Driver
http://www.linear.com/product/LTC6957-1
This is VERY interesting, especially the low noise PECL output. I have
On 4/16/13 11:04 AM, Attila Kinali wrote:
On Mon, 15 Apr 2013 23:00:49 -0700
Jim Lux wrote:
the effect of a strong multipath (which is what the choke ring
suppresses) would be a LOT bigger than that..
Uhmm.. to my understanding, this is not quite true.
The choke ring does not surpress genera
Mark wrote:
I recently purchased a pair of Z3805A
The problem I am seeing on both is the predicted uncertainty is high
compared to other receivers I have seen.
I am experiencing a PU of ~8us for the first and ~24us for the second.
My questions are,
What could be causing such bad figures?
Is
On 4/16/13 5:19 PM, Sarah White wrote:
I just have to ask though... cake pans? really? I can't imagine it would
even be possible to modify a cake pan with enough accuracy to get a
usable antenna.
Sure.. cake pans, like other stamped goods, are actually pretty high
precision, because they're
Actually, before I plugged the GPS antenna into the second unit, I checked out
where it last called home:
LAT N 36:01:05.225
LON E 128:41:48.761
HGT+1214.14 m (MSL)
So it was pretty high up somewhere in south Korea.
Regarding the second unit:
After I collected this information, I plugg
On 4/16/13 8:28 PM, Mark C. Stephens wrote:
Actually, before I plugged the GPS antenna into the second unit, I checked out
where it last called home:
LAT N 36:01:05.225
LON E 128:41:48.761
HGT+1214.14 m (MSL)
Mt Palgong, according to Google Earth
Lots of transmitter towers up there,
A few reasons:
- I am interested to see what can be done with the statistics of an
ensemble of oscillators---in particular, whether the additional measurements
can be used to get a timescale that is more stable than just GPS and OCXO or Rb.
- To produce some data that could be used for
Nope, been there, tried that. Supposedly Trimble had a firmware option for
doing/reporting proper carrier phase stuff, but I have never seen a Tbolt with
it.
---
I don't know if the Trimble TBolt or Res-t give out enough information to
generate RINEX
I have been working a version 4.0 of Lady Heather. One thing that I would like
to implement is better error checking on the serial data port...
parity/framing/overrun errors. I haven't been able to find much valid info on
how to coax this info out of Windows... Does anybody know how?
> Tom, you scare me some times, this is one of them... or the time actually.
Magnus,
I remember why I didn't measure the M12 oscillators directly -- it's a real
challenge to get at the signal on the back side of the PCB and to measure it
without loading the crystal. It's not like just connectin
See ClearCommError() and CE_RXPARITY, CE_FRAME, CE_OVERRUN
/tvb
- Original Message -
From: "Mark Sims"
To:
Sent: Tuesday, April 16, 2013 10:19 PM
Subject: [time-nuts] Windows serial port error reporting question
>I have been working a version 4.0 of Lady Heather. One thing that I wo
From: Sarah White
I just have to ask though... cake pans? really? I can't imagine it would
even be possible to modify a cake pan with enough accuracy to get a
usable antenna.
-- Sarah
Well, my GPS antenna farm uses an inverted baking tray
http://w
Mark wrote:
For the first 6 hours PU stayed at 432us, then it dropped sharply to
5.6us and then slowly climbed to 18us.
Doesn't seem right to me.
Nothing it does in the first 6 hours has anything to do with
anything. (1) The oscillator will be swinging around wildly
(comparatively speaking
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