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 to
If you can find it, I would try something around 16" diameter with at least 1"
walls (deep dish). And round, none of that rectangular stuff. Mount the
antenna on the bottom side of the pan, with the walls/open side facing down...
sort of a single choke ring. A flat pan should also be OK.
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 surrounded by very tall trees and multipath from the trees, ste
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 surrounded by very tall trees and multipath from the trees, steel gates and
stucco walls, a house, an iron fence, etc. I used four dif
Hi Bill,
Is this what you're looking for?
EZGPIB_TimeWaitForMultipleOf(x)
This will pause the program for x seconds. I use it inside a loop to
trigger a measurement / report cycle every x seconds.
Ed
Bill wrote:
I am trying to use EZGPIB with a HP 5370A and I want to trigger a
reading on
It can be difficult to tell if a receiver is carrier phase capable since it was
usually a firmware option in most general purpose receiver boards and that
option may not be labelled. Your best bet is a surveying receiver.
The main problem is a standard L1 frequency only receiver is not much be
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 to be VERY difficult
to tra
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
My question is what is the PASCAL code
To the "Time Nuts" discussion group:
I made a great find -- a GPS bullet antenna with type "F" connector
(Trimble Navigation 25045-10) This antenna arrived "brand new" with a
Shakespeare Polycarbonate extension mast and a Shakespeare Style Nylon
Ratchet Mount. It works very well with my Tri
Chris,
I, too, am new to the 'time-nuts' but began with the same goal you have of a
stable and accurate bench reference. That said, I now have Thunderbolt's,
Z3816A's, 5061A's, and a 5061B and 5065A.
One of my Thunderbolt's died that I think was due to a switching power
supply powering the unit.
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 to be VERY difficult
to tra
> While toying with an attempt to use a Thunderbolt to generate a RINEX file
> for GPS precision post processing I discovered a difference between the
> 2.22 and 3.00 App firmware. The 2.22 firmware generates the ECEF
> position/velocity messages as documented. The rev 3.00 firmware does not
> ge
Hi Said,
> Hi Magnus,
>
> Agree with all your points.
>
> On the added noise due to an accelerometer, my thoughts are that this
> needs
> to be carefully designed so as not to add more error than we are actually
> removing (due to phase shifts between crystal sensitivity and the
> accelerometer
I have purchased several items from that seller without problem. He ships via
Hong Kong post which gets handled by the US postal service... never had any
customs duties, etc. All items arrived within a week or two. A couple of
times I have emailed him asking questions about an item and have
While toying with an attempt to use a Thunderbolt to generate a RINEX file for
GPS precision post processing I discovered a difference between the 2.22 and
3.00 App firmware. The 2.22 firmware generates the ECEF position/velocity
messages as documented. The rev 3.00 firmware does not generate
Chris Bridge wrote:
Hi ,
I was pointed to an Ebay seller who has an entire kit available (from
China of course). Not knowing the product or pricing any better, can I
get a comment on this link please?
http://cgi.ebay.ca/Thunderbolt-PRECISION-GPS-10Mhz-1PPS-Standard-Easy-Kit_W0QQitemZ1703444
saidj...@aol.com wrote:
Hi Magnus,
Agree with all your points.
:)
On the added noise due to an accelerometer, my thoughts are that this needs
to be carefully designed so as not to add more error than we are actually
removing (due to phase shifts between crystal sensitivity and the
accel
Hi ,
I was pointed to an Ebay seller who has an entire kit available
(from China of course). Not knowing the product or pricing any better,
can I get a comment on this link please?
http://cgi.ebay.ca/Thunderbolt-PRECISION-GPS-10Mhz-1PPS-Standard-Easy-Kit_W0QQitemZ170344432395QQcmdZViewItemQ
Hi Magnus,
Agree with all your points.
On the added noise due to an accelerometer, my thoughts are that this needs
to be carefully designed so as not to add more error than we are actually
removing (due to phase shifts between crystal sensitivity and the
accelerometer response for example
"The candle that burns twice as bright, burns half as long..."
I've heard, but have not verified myself, that 5071A
high-performance tubes will last at least 7 years of
continuous use and that 5071A standard-performance
tubes can last around 20 years.
For high-perf tubes end-of-life is usually
I recently ran across a paper from the 1980 Frequency Control Symposium, in
which HP and the USNO released their surveys on 5061/5062 failure modes.
There was a special emphasis on beam-tube life, showing strong positive
trends as HP got better at manufacturing the tubes in the 1970s:
Longevity Pe
Gents,
I just uploaded a new version of Z38XX with the following improvements:
1) 115200 Baud setting bug removed
2) Should now recognize JACKSON LABS products and use partial/changed SCPI
command set on those (Need feedback on that!)
3) Possible bug in status screen interpretation removed
4)
Brian,
> terminal window. Stop the program and bring up Hyperterminal
> and start recording data
and in case you need to perform something even sligthly more complex than
just listen to a talker on the bus then you are a candidate for EZGPIB.
Best regards
Ulrich Bangert
> -Ursprunglic
Didier wrote:
That is interestng and brings a question that I should be able to answer but
have been too busy (or lazy...) to try...
The HP 5370 has a noisy fan, and an HP 10811 in the same box. Has anyone
been curious enough to measure the effect of fan vibration on the oscillator
and p-p noise
Said and Björn,
saidj...@aol.com wrote:
Hello Bjoern,
that would work well for static acceleration (tilt) but for vibration
resistance the crystal must be low-g, or complexly compensated with wide loop
bandwidths such as the FEI papers describe.
It could work for low-frequency compensati
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