The Thunderbolt uses single precision floating point and digital filtering for
temperature so yes, you are going to see values like this. This is not unusual
(precision clearly out of step with accuracy), like the HP network analyzers
returning gain in dB with 4 decimals at microwave
The Thunderbolt uses single precision floating point and digital filtering
for temperature so yes, you are going to see values like this. This is not
unusual (precision clearly out of step with accuracy), like the HP network
analyzers returning gain in dB with 4 decimals at microwave
On 11/24/13 4:23 AM, Didier Juges wrote:
The Thunderbolt uses single precision floating point and digital filtering for
temperature so yes, you are going to see values like this. This is not unusual
(precision clearly out of step with accuracy), like the HP network analyzers
returning gain in
On Sun, Nov 24, 2013 at 7:13 AM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
The Thunderbolt uses single precision floating point and digital filtering
for temperature so yes, you are going to see values like this. This is not
unusual (precision clearly out of step with accuracy),
On Thu, 21 Nov 2013 19:47:03 -0500
Dale J. Robertson d...@nap-us.com wrote:
An interesting technique for improving the accuracy of single band gps is
embodied in an open source program/project called rtklib.
Essentially it uses one GPS receiver in a fixed location that has been very
When I asked about Crude Survey Techniques I never expected results much
better than the 10 ft accuracy someone volunteered from the first. In a former
life I ran an engineering department that worked on the old FAA SCAT-1 DGPS
landing project, where I did learn a bit about GPS and its
In message 8d0b752c7051aaf-1670-69...@webmail-d157.sysops.aol.com, johncroos@
aol.com writes:
I realize that any number to the right of the 5th decimal point
reported by T-Bolt mon is likely bogus. The data I reported earlier
pretty much supports that. Now I am running tests with 3 units set
for
Try averaging for about 86160 seconds instead of 86400 seconds.
See: http://spot.colorado.edu/~kristine/gpsrep.pdf
/tvb
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david-tay...@blueyonder.co.uk said:
I do see computer temperature sensors reporting in millidegrees, with an
accuracy of +/- 2°C!
That's perfectly reasonable if the sensor is locally linear so the deltas
between nearby readings are meaningful.
It's the same thing as measuring the frequency
, November 21, 2013 10:52 AM
Subject: [time-nuts] Crude Survey Technique
I wish to establish a north south line on my property to an accuracy of +/-
2 degrees.
Could this be done by loading a T-bolt, Antenna, Power source, and laptop
into my
little red wagon? The idea being to find two positions
)
--
Message: 1
Date: Sat, 23 Nov 2013 11:03:54 -0800
From: WarrenS warrensjmail-...@yahoo.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Crude Survey Technique
Message-ID
johncr...@aol.com said:
Understood. I have a couple more questions. Once the thunderbolt has
completed a survey, does it continue to update its position or are the final
numbers at the end of the survey frozen until a new survey has started.
The position is frozen. That's the whole point of
I hope no-one believes all the decimal digits shown in that screen-shot! It
seems to me that it would be better if more realistic values were presented!
37.808842 °C - really!
David
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SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email:
John,
We had a similar problem when we're trying to setup various antennas at
various locations pointing at different true North bearings. It turned out
quite hard to find true North.
We found single carrier GPS surveyed points to be inaccurate to produce
good bearings across such a short base
On 11/21/13 11:32 PM, Robert Atkinson wrote:
I'd also go for a compass if you want magnetic north, but then I have a good one, a
medium landing compass. Mine dates from WWII but they are still made
http://www.sirs.co.uk/ground/landing_compasses/patt2/landing_resource
These are used to align
Stephen -
[time-nuts] Crude Survey Technique
Thanks for describing your method. I am learning a lot. here is agovt web site
that will give the compass correction for any long and lat. Here in KS the
magnetic pole is about 2.3 degrees to the east.
Once all the ideas are in, I will put
If the telescope on your transit can go to your lattitude, sight Polaris
and you're done after a simple calculation.
-John
Stephen -
[time-nuts] Crude Survey Technique
Thanks for describing your method. I am learning a lot. here is agovt web
site that will give
November 2013, 14:25
Subject: Re: [time-nuts] Crude Survey Technique
On 11/21/13 11:32 PM, Robert Atkinson wrote:
I'd also go for a compass if you want magnetic north, but then I have a good
one, a medium landing compass. Mine dates from WWII but they are still made
http://www.sirs.co.uk
On Friday, November 22, 2013, J. Forster wrote:
If the telescope on your transit can go to your lattitude, sight Polaris
and you're done after a simple calculation.
This is the simplest high-accuracy solution. Celestial navigation is your
friend.
A magnetic compass is the simplest solution.
Hello and thanks to all for the great ideas.
Re: [time-nuts] Crude Survey Technique
Some interim comments:
*agree with regard to using pole star. However it is below freezing here and so
I won't be out in the dark with my camera. A good verification technique that
must await warmer
/ inverting telescopes tend to be
cheaper.
-John
===
Hello and thanks to all for the great ideas.
Re: [time-nuts] Crude Survey Technique
Some interim comments:
*agree with regard to using pole star. However it is below freezing here
and so I won't be out in the dark
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on aircraft.
Good to half a degree. If you need better ther is the Watts Datum Compass.
Robert G8RPI.
From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, 21 November 2013, 23:28
Subject: Re: [time-nuts] Crude
Lord no, John. No red wagon is needed. Use a pole and the equation of
time, and a good watch or clock. At local noon, a shadow will be a n-s
line. If you don't have a decent clock, like your cellphone, put in a
pole at one end of your line. Near local noon, which depends on where
you are in the
For something that crude, I'd consider taking a sight on Polaris. If you
note the time and do the math, you can probably do better than your
bounds.
Also, there is almost certainly an app somewhere to do the math for you. I
think tha reeuction info was in Bowditch or the Nautical Almanac.
FWIW,
it's not possible to update
them!
Robert G8RPI.
From: Neville Michie namic...@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, 21 November 2013, 21:46
Subject: Re: [time-nuts] Crude Survey Technique
How
Hi John:
I have a web page devoted to Finding North, see:
http://www.prc68.com/I/North.shtml
Have Fun,
Brooke Clarke, N6GCE
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
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To
...@febo.com time-nuts-boun...@febo.com on behalf of Brian
Lloyd br...@lloyd.com
Sent: Thursday, November 21, 2013 2:04 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Crude Survey Technique
On Thu, Nov 21, 2013 at 12:52 PM, johncr...@aol.com wrote:
I wish
.
From: time-nuts-boun...@febo.com time-nuts-boun...@febo.com on behalf
of Brian Lloyd br...@lloyd.com
Sent: Thursday, November 21, 2013 2:04 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Crude Survey Technique
On Thu, Nov 21
;
--
Message: 2
Date: Thu, 21 Nov 2013 13:52:49 -0500 (EST)
From: johncr...@aol.com
To: time-nuts@febo.com
Subject: [time-nuts] Crude Survey Technique
Message-ID: lt;8d0b5020292d91e-cc0-4b...@webmail-vm026.sysops.aol.comgt;
Content-Type: text/plain; charset=us-ascii
I wish
:04 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Crude Survey Technique
On Thu, Nov 21, 2013 at 12:52 PM, johncr...@aol.com wrote:
I wish to establish a north south line on my property to an accuracy
of
+/- 2 degrees.
Could this be done by loading a T
On Thu, Nov 21, 2013 at 11:11 AM, Don Latham d...@montana.com wrote:
Lord no, John. No red wagon is needed. Use a pole and the equation of
time, and a good watch or clock. At local noon, a shadow will be a n-s
line.
How accurate do you need to be? The above requires a very tall pole
to case
On Thu, Nov 21, 2013 at 12:45 PM, tmil...@skylinenet.net wrote:
If you want true north, set up a camera that has time or bulb shutter at the
south end of your property. Put in a marker stake. take a time exposure at
night with the camera facing north. If you expose for about 30 minutes, you
As I said before, the RA and Dec of Polaris is well known.
Spherical trig and the Siderial Time will give you the offset from the
true pole in Az and El.
With corrections for refraction, this is good to better than an arc-second.
-John
==
On Thu, Nov 21, 2013 at 12:45 PM,
I've done this and your best option is to go out at night with a home made
tripod, plumb bob and sight from one place to another with polaris and the
plumb bob string. The farther the better, then keep your reference points with
a couple of iron posts. You will be well under 1/2 deg and
On Thu, 21 Nov 2013 15:28:32 -0800, Chris Albertson wrote:
If you need a very tall pole that is 100% vertical then hang a
weighted rope from a tall support. Then go to the other end and watch
the seconds tick down.
Be carefull!... A plumb bob does not hang vertically (point to center of
Subject: [time-nuts] Crude Survey Technique
I wish to establish a north south line on my property to an accuracy of +/-
2 degrees.
Could this be done by loading a T-bolt, Antenna, Power source, and laptop
into my
little red wagon? The idea being to find two positions several hundred ft
apart where
Coriolis ain't a force :-)
A real tall pole isn't required, just another person
Bill Beam
On Thu, 21 Nov 2013 15:28:32 -0800, Chris Albertson wrote:
If you need a very tall pole that is 100% vertical then hang a
weighted rope from a tall support. Then go to the other end and watch
the seconds
I wish to establish a north south line on my property to an accuracy of +/- 2
degrees.
Could this be done by loading a T-bolt, Antenna, Power source, and laptop into
my
little red wagon? The idea being to find two positions several hundred ft apart
where either LH or T-bolt Mon report the same
That's my point. 'Coriolis force' was invented to make it appear that Newtons
laws
were valid in an Earth based frame.
On Thu, 21 Nov 2013 18:06:54 -0700, Don Latham wrote:
Coriolis ain't a force :-)
Newtons laws are NOT valid in a noninertial frame. (That's why the
Coriolis force
was
On 11/21/13 3:28 PM, Chris Albertson wrote:
On Thu, Nov 21, 2013 at 11:11 AM, Don Latham d...@montana.com wrote:
Lord no, John. No red wagon is needed. Use a pole and the equation of
time, and a good watch or clock. At local noon, a shadow will be a n-s
line.
How accurate do you need to be?
On Thu, Nov 21, 2013 at 12:52 PM, johncr...@aol.com wrote:
I wish to establish a north south line on my property to an accuracy of
+/- 2 degrees.
Could this be done by loading a T-bolt, Antenna, Power source, and laptop
into my
little red wagon? The idea being to find two positions several
Brooke Clarke wrote: Most low cost hand held and car GPS receivers can only
display direction
based on changes in position.
True, but the Garmin 62s handheld that I use for geocaching and hiking
($200-$400) has a
3-axis, tilt-compensated electronic compass that shows your heading even when
.
From: time-nuts-boun...@febo.com time-nuts-boun...@febo.com on behalf of
Brian Lloyd br...@lloyd.com
Sent: Thursday, November 21, 2013 2:04 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Crude Survey Technique
On Thu, Nov 21, 2013
:04 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Crude Survey Technique
On Thu, Nov 21, 2013 at 12:52 PM, johncr...@aol.com wrote:
I wish to establish a north south line on my property to an accuracy of
+/- 2 degrees.
Could this be done by loading a T
John: for local noon:
http://education.illinois.edu/noon-project/noontime.html
Don
johncr...@aol.com
I wish to establish a north south line on my property to an accuracy of
+/- 2 degrees.
Could this be done by loading a T-bolt, Antenna, Power source, and
laptop into my
little red wagon? The
In message 8d0b5020292d91e-cc0-4b...@webmail-vm026.sysops.aol.com, johncroos@
aol.com writes:
I wish to establish a north south line on my property to an
accuracy of +/- 2 degrees.
First of all, at that level of precision you will have to decide what
you mean by north south ?
Magnetic ?
Southward (toward equator) deflection would actually improve
the geometry. All non-north vectors would
be lengthened in proportion.
On 11/21/2013 6:37 PM, Bill Beam wrote:
On Thu, 21 Nov 2013 15:28:32 -0800, Chris Albertson wrote:
If you need a very tall pole that is 100% vertical then
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