On Wed, Aug 25, 2010 at 16:47, J. Forster j...@quik.com wrote:
Hi Jim,
Yes, it would be a lot of work to write Wiki style articles on all list
topics.
The point of wikis is that people write what they know,
if they have the will to write about it, and when they have the time.
Another option
[VOR vs DF]
doh,, of course...
Brains are weird. They often get stuck in the wrong mode.
Optical illusions are a good example.
When I first saw this thread, my reaction was Try a sundial.
When I started typing in a response, I got flipped to the other mode and
couldn't figure out how that
All the fire towers I've been in have a plumb line in the centre of the room
and circular graduated ring above window height.
When the spotter sees something of interest, all (s)he has to do is stand
behind the string and make a report.
ian
I never found a better method than observing a circumpolar star at
night with
a theodolite and an almanac to find South or North.
You then find a distant object known as the referred object, and find
its azimuth.
From then on at that station you can use the RO to set your azimuth.
At home
Hi
I suspect that the term fire tower was being used in the generic sense. More or
less any tower with a deck on a hill top is a fire tower.
Bob
On Aug 27, 2010, at 8:50 AM, gonzo . cadbl...@hotmail.com wrote:
All the fire towers I've been in have a plumb line in the centre of the room
Thomas A. Frank wrote:
I would suggest you buy an old surveying transit.
This is what largely they were intended for.
ANd with a transit, you can easily see Polaris in the day time.
Here's an article discussing how to do it
http://www.cadastral.com/cad-polr.htm
skip down to the section on
- Original Message
From: Neville Michie namic...@gmail.com
snip
It seems strange, with all those satellites, whose position is known with such
accuracy,
that we can not get an accurate azimuth, but then we do not have a sighting
device to observe a referred object or satellites.
Back in the early 1980's when attending college I worked on a single
axis multi-mode fiber optic
rate gyro project that used GRIN fiber. Back then a military three axis
unit based on single mode
fiber was alleged to be a little larger than a one inch cube and cost
slightly less than a
Hi
I've been digging around at acc.igs.org. They seem to think that their clock
models are good to below 0.05 ns. They compare that to a 2 ns number for the
as broadcast models. 2 ns is a pretty familiar number if you look at a lot of
TBolt plots. All of their data is online and available for
Hi Bob:
The ultimate is a carrier phase GPS Timing receiver. The early work was
done using Ashtech Z12 models that have a provision for an external 10
MHz oscillator. I have a feeling that the units you're talking about
are a refinement of this approach.
The new L5 frequency of GPS,
Hi Bob:
Here's an interesting sidebar:
Precision Modeling for Orbit Determination
http://www.aero.org/publications/crosslink/summer2002/02_sidebar2.html
from the web page:
Orbit Determination and Satellite Navigation
http://www.aero.org/publications/crosslink/summer2002/04.html
I didn't know
Thanks Bob, Interesting stuff.
Has anybody else dug into any of this?
I have no experience with using LI/L2, or how good it is,
But as far as making Tbolt's better, No problem to make them 2 or 3X
better all the time, by going to an external better optimized controller
algorithm.
Lady
I didn't know the Moon tides can change the elevation of LA by 40 cm!
Yup, tides in solid rock.
I think it's been mentioned here before, probably more than once.
There are two cases that I know about where it really matters:
Radio Astronomy
If you are doing VLBI, you need to know the
Brooke Clarke wrote:
Hi Bob:
Here's an interesting sidebar:
Precision Modeling for Orbit Determination
http://www.aero.org/publications/crosslink/summer2002/02_sidebar2.html
from the web page:
Orbit Determination and Satellite Navigation
You'd think that something at the edge of a continent that moved
up and down that much every month would break off.
Wait, it's rock all the way down.
Bill Hawkins
-Original Message-
From: Brooke Clarke
Sent: Friday, August 27, 2010 12:34 PM
---snip---
I didn't know the Moon tides can
Hi
Some how I seem to be disconnected from the list. I suspect something is amiss
with my local mail server
The issue of how to really improve accuracy is indeed whack a mole sort of
stuff. Averaging better data is always a good start, but only if it's better
data. Since the data is not
I've listed an FTS 1000B on eBay. Item # 320580887914 if anyones
interested.
Corby
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On 08/27/2010 07:03 PM, Brooke Clarke wrote:
Hi Bob:
The ultimate is a carrier phase GPS Timing receiver. The early work was
done using Ashtech Z12 models that have a provision for an external 10
MHz oscillator. I have a feeling that the units you're talking about are
a refinement of this
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