Hi Mark,
Mark Sims wrote:
I wanted to have Heather make a RINEX file that could be submiited to OPUS-GIS to get a more precise antenna location. The Tbolt does not support carrier phase measurements. It does output doppler values.
The code phase (pseudorange) values that it outputs look
christopher hoover wrote:
I wanted to have Heather make a RINEX file that could be submiited to
OPUS-GIS to get a more precise antenna location. The Tbolt does not
support carrier phase measurements. It does output doppler values.
The code phase (pseudorange) values that it outputs look
Bill,
there are two sleep commands:
1) Procedure EZGPIB_TimeSleep(HowLong:Double)
2) Procedure EZGPIB_TimeWaitForMultipleOf(Seconds:LongWord)
where Howlong is in seconds and starts immediately after call. The second
one is for you if you want to keep something synchronized to the computer's
What typically-available surplus receivers do carrier phase
measurements[1]? I'm close to putting up a choke ring antenna I scored
off of the surplus market on the roof -- I don't think the wife is going
to let me build a proper monument in the yard. :-) Hence, I, too,
am interested
The main problem is a standard L1 frequency only receiver is not much
better than a plain jane receiver when Selective Availability is turned
off (and particularly is WAAS corrections are available). This is the
standard operating mode of GPS today. Choke ring antennas, etc are
fairly
Bill,
It might be a set of cake pans... ;-)
--
Björn
Mark,
Is that thin or deep pan ?
BillWB6BNQ
Mark Sims wrote:
Now that I have a precise spot (+/- 4cm) known on my front deck I set up
a tripod and did numerous 1400 point self-surveys with a Thunderbolt.
This spot is
But to answer the question, the CMC/Novatel series OEM boards, Motorola
and Ashtech receivers can all have carrier phase ability. However, the
carrier phase capable receivers is not easy to find.
The Motorola Oncore VP did have carrier phase output. (with the right
option loaded.) In newer
I note the Chinese supplier offers two kits, one more expensive than the
other. The difference is the GPS aerial. Anybody any experience of the
difference between them?
David
Mark Sims hol...@hotmail.com 12/07/2009 23:21
I have purchased several items from that seller without problem. He
Hi David,
(I did not check the exact offer of your CN supplier)
How do you intend to mount the antenna? How long a cable must you run from
the Tbolt to the antenna?
Will a small magnetic mount antenna puck with a 3-5 meter thin koax
attached mount ok and give a clear view of the sky? If yes,
On 7/13/09 1:59 AM, b...@lysator.liu.se b...@lysator.liu.se wrote:
What typically-available surplus receivers do carrier phase
measurements[1]? I'm close to putting up a choke ring antenna I scored
off of the surplus market on the roof -- I don't think the wife is going
to let me
Ulrich Bangert wrote:
Bill,
there are two sleep commands:
1) Procedure EZGPIB_TimeSleep(HowLong:Double)
2) Procedure EZGPIB_TimeWaitForMultipleOf(Seconds:LongWord)
where Howlong is in seconds and starts immediately after call. The second
one is for you if you want to keep something
Bill,
I am using the 5370 for time interval measurements to compare zero
crossings from the two oscillators.
I want to see what the stability is over twenty four hours.
I have currently not the time to fully explain, but the measurements you are
planning involve much more than just to
Hallo all the Time Nuts experts,
I need some help to find the understanding for a
optimized setup with Trimble's Thunderbolts with original
and other OCXOs like HP's 10811.
At the first glance the output of the TB does look quite
good if I trust the values given by LH adev etc.
But how good
Hi, Bill --
I am trying to use EZGPIB with a HP 5370A and I want to trigger a
reading on a 10 to 30 second interval.
I want the use EZGPIB to do long term comparisons of various
oscillators, I am not interested (at this time)
on jitter less than tau 1 seconds or so
I
Astonishing for me,
I found that the 10811 does behave better in undisciplined
mode for a limited time:
This is to be expected. An undisciplined high-quality OCXO
like a 10811 will be hundreds or thousands of times better
than the raw output of a GPS receiver at short averaging
times. This is
Arnold,
I have the same question as well as observations as yours. I have been
working with both the TBolt and Fury connected to two different 10811s. With
either the TBolt or Fury, I can't get the TC large enough to only provide a
nudge to the EFC every few minutes. Both receivers get real
yes that is what I thought, but if I do observe correct, TB's
OCXO does not run at all free for minutes. With a time
constant of 360s the EFC and thePPS is surfing up and
down, why, I do not see the need to shift this OCXO within
2 minutes 80ppbs up and pps15ns as well - with this stable
What are you using for the Kvco constant with your 10811-based Thunderbolt?
If you don't back it down to -0.2 V/Hz, the loop's damping factor will be
very wrong, which might confuse the firmware. Check the Kvco, and also do a
factory reset after changing the OCXO to make sure it forgets anything
John,
Yes, I have changed the gain to exactly your suggested -0.2 V/Hz and I have
experimented with the damping from .5 to 3 and I'm currently using 1.00. Things
certainly change with various damping and TC settings but not nearly as slow
and subtel as I would like to see for an oscillator
While playing with getting the Thunderbolt to supply a more accurate/reliable
position, I came up with a way to filter the lat/lon/alt data in such a way
that you can get a pretty darned accurate location (a quick test shows sub 1
foot accuracy should be doable).
The only problem is there
Don,
When you say you see about 3 nSec standard deviation,
where is this number coming from? As reported by a
program like GPScon or LH, or an actual measurement
of the 1pps or 10 MHz output against a lab standard?
/tvb
___
time-nuts mailing list --
The only way that I can think up that might work is to
calculate the high accuracy position, put the unit into
3D fix mode, wait until it randomly comes up with a
fix that is very close to the desired value (which may
never happen), then put the unit into position hold
mode... craptastic...
Tom,
The most direct and quickest way I observe this is from GPScon (also use LH). I
also constantly monitor one or the other GPSDO setups with an SR620 (zero
crossing technique) with an LPRO-101 as the reference. I use an Tektronix
monitor display on the SR620 so I can watch deviation from
I spent several hours trying to find out why I started getting longitude number
that were way off. Everything seemed to be working properly, but the tbolt was
reporting longitude numbers way off from the surveyed position.
I thought that my attempts to feed it an accurate lunch had gotten
Hi Don,
to disable the Fury (or FireFly) GPS receiver from disciplining the unit,
send the command:
sync:sour:mode ext
That will switch the unit to external 1PPS input, and thus make it go into
holdover if there is nothing connected to the external 1PPS input.
Bye,
Said
In a
Hi Don,
to disable the Fury (or FireFly) GPS receiver from disciplining the unit,
send the command:
sync:sour:mode ext
That will switch the unit to external 1PPS input, and thus make it go into
holdover if there is nothing connected to the external 1PPS input.
Bye,
Said
Two
Based on my experience with the HP 8660C (detailed below) I suspect fan
noise could have an effect on HP 5370 performance.
I was project manager for the HP8660C synthesizer. During the project we
discovered the fan in the 8660C was adding significant close-in noise
sidebands to the
Hello Time-nuts,
I'm looking for the connector to mate with a Trimble Acutime 2000. The
connector part number is Deutch MMP 26C-2212S1, pins are 6862-201-22278, and
back shell is 6810-204-2001.
I've tried the usual - Mouser, Digi-Key, and Newark. Who is their
distributor in the US?
I
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