Thanks for putting the manual online.
With humor you just have to love a rack tall standard with vac pumps and
hydrogen bottles and that actually takes an arc welder to demagnetize it!
Yikes now thats serious.
Jimmy don't try this at home.

On Tue, Aug 31, 2010 at 5:29 PM, Corby Dawson cdelect@juno.com wrote:

So by those pictures you actually have it working?
Crazy question do you just drive down to your local air gas company and by
some hydrogen. How do you fill the red bottle?
Just down loaded the tech manual earlier printed out the ops manual.
Thanks

On Tue, Aug 31, 2010 at 10:35 PM, Tom Van Baak tvb@leapsecond.com wrote:

In message 24C547B54EA34A69BACC4F823BB4036F@pc52, "Tom Van Baak" writes:

Interesting.

Page 4/3 in the service manual states:

For the Hydrogen Maser, this unperturbed frequency
is
	f(H) = 1 420 405 751.768 +/- 0.002 Hz

In practice, this frequency is perturbed by
interaction of the hydrogen atoms with the walls
of the interaction volume container, doppler
effects, interactions between the atoms themsel-
ves, etc.  The resulting frequency for the EFOS
Maser is taken to be

	F(o) = 1 420 405 751.689 Hz

I have no idea where the EFOS was produced, but somebody should try
to calculate the relativistic correction for their height above the
geoid, and see how much of the systematic 0.079Hz frequency difference
that explains...

If I were to build a maser myself, I would probably not attempt
to copy the EFOS, as the large mechanical dimensions add significant
cost in materials and machining.

I would be much more tempted by a sapphire loaded cavity design like
this one:

http://www.nict.go.jp/publication/shuppan/kihou-journal/journal-vol50no1.2/0304.pdf)

As that brings the mechanics inside the work envelope of main-stream
CNC machines with the required tolerances.

Poul-Henning

--
Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG        | TCP/IP since RFC 956
FreeBSD committer      | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

On 09/01/2010 09:39 PM, Poul-Henning Kamp wrote:

Neuchatel, which still leaves a bit of unspecified height.

However, this effect would be cancelled as their cesium clocks would be
on the same height above the geoid (give or take a few meters).

So, their indication is correct. The C-field also pulls the atoms of
course, which they failed to point out in the cited text.

Yes, but what is the issues relating to sapphire loading? What's the
cost of the sapphire block and having it machined?

Cheers,
Magnus

In message 4C7EB129.2090305@rubidium.dyndns.org, Magnus Danielson writes:

It is a saphire tube, a readily available, if not exactly cheap, commodity.

--
Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG        | TCP/IP since RFC 956
FreeBSD committer      | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

Magnus Danielson wrote:

The tempco of the dielectric constant of sapphire is quite large so the
cavity resonance tempco is somewhat larger than that of an unloaded
copper or aluminium cavity.

There is a NIST paper detailing a somewhat earlier attempt to use a
dielectric cavity:
http://tf.nist.gov/general/pdf/156.pdf

Again the dielectric constant tempco is a significant issue.

Bruce

In message 4C7EB534.2040606@xtra.co.nz, Bruce Griffiths writes:

Yes, they write that cavity autotuning is a must.

I still think that is a smaller problem than getting hold of and
maching an unloaded cavity with the necessary shields.

--
Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG        | TCP/IP since RFC 956
FreeBSD committer      | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

An early analysis of a fused silica loaded cavity by Sigma Tau:
http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA497003&Location=U2&doc=GetTRDoc.pdf
http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA497003&Location=U2&doc=GetTRDoc.pdf

Although the dielectric constant tempco and thermal expansion tempco of
fused silica is low so is the dielectric constant so the reduction in
cavity volume is relatively small.

The reduced Q of a dielectric loaded cavity may also be an issue in the
absence of cryogenic cavity cooling.

Bruce

Poul-Henning Kamp wrote:

Reading the tech manual. The Hmaser only draws 100 watts. Thats far less
then I thought it did. I guess the shear size of the cavity makes it appear
like a power beast.

On Tue, Aug 31, 2010 at 5:29 PM, Corby Dawson cdelect@juno.com wrote:

paul swed wrote:

Basically, yes.. you can order up a tank of H2 pretty easily.  However,
I would think you need a fairly pure grade (e.g. oxyhydrogen welding
grade aint gonna cut it)..
For small amounts, a "lecture bottle" (2 cu ft at STP) would probably be
the way to go.

Or, generate it yourself (zinc and acid, for instance)

If you decide to go the zinc/acid route (a very bad idea, IMO) you will
need a compressor. I'd not want anything to do with that! I like living.

A Lecture Bottle is the way to go.

-John

=================

Sapphire is pretty inexpensive (relatively speaking).. they grow it in
big boules by the Czochralski process (like silicon).  Machining might
be tricky.. it's pretty hard, so diamond tooling would be needed.

(I was thinking about making my wife a necklace of sapphire ball
bearings.. they're chromium doped (i.e. rubies) to make them easier to
find when you drop them.  You can also get clear sapphire spheres,
plates, and pretty much any lens shape you want.  Edmund had the ball
bearings for, as I recall, something like $8 each for 5mm diameter.

They're used in ball point pens, too.

http://www.industrialjewels.com/
http://www.birdprecision.com/

Poul-Henning Kamp wrote:

might not be all that expensive..
I just looked up optical quality balls from Edmund.. 5mm diameter is
<$20 (of coure, 9.525mm is $60)

you might check http://www.melleroptics.com

0.250"OD X.150"ID X 0.875"LONG
SAPPHIRE TUBE PL/PL

is $110

J. Forster wrote:

Why would you compress it.. I imagine that you need micrograms of H2..
(it is almost a vacuum, right?)..

And yes, zinc/acid probably is a bad way... How about electrolysis of
distilled water.  (I know you're not going to think that sodium/H2O is a
good approach, eh?)

(on the other hand a lecture bottle is cheap and easy.. but this is
time-nuts, where sometimes we like advocating the "hard way"... so what
about some exotic nuclear reaction that throws off protons...I hesitate
to suggest fissioning He, if it's even possible...)

On Wed, 01 Sep 2010 22:37:36 -0700
jimlux jimlux@earthlink.net wrote:

In one of the papers i've read (which i'm currently unable to find),
they used a electrolysis of KOH with a purifier. I don't know about
KOH but NaOH is quite easy to get in large quantities. The only prob
with it might be to keep it from taking too much water in.

Single protons wont do it. The hyperfine line a H maser taps into is
comes from the difference of the orientation of spins between the proton
and its electron. And if i got it correctyl, you also have to make sure
that the atom isn't excited in any way. Which isn't exactly easy if you
start with a single proton and let it recombine with an electron.

			Attila Kinali

--
Why does it take years to find the answers to
the questions one should have asked long ago?

On Wed, 01 Sep 2010 20:08:13 +0000
"Poul-Henning Kamp" phk@phk.freebsd.dk wrote:

Why saphir? Aluminia (AlO2) seems to be used as well to load H maser
cavities. Or is saphir in some way better?

			Attila Kinali

--
Why does it take years to find the answers to
the questions one should have asked long ago?

In message 20100902082809.fff6c994.attila@kinali.ch, Attila Kinali writes:

Normally you would use "glaubersalt", (NA2SO4 I belive) to increase
conductivity in small electrolysis setups, where you do not want
any aggressive chemicals.  If you are more tolerant, you simply add
a couple of drops of sulfuric acid.

--
Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG        | TCP/IP since RFC 956
FreeBSD committer      | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

In message 20100902083014.d223768b.attila@kinali.ch, Attila Kinali writes:

No idea, that's the paper I found...

--
Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG        | TCP/IP since RFC 956
FreeBSD committer      | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

Attila Kinali wrote:

Sapphire and ruby are slightly impure varieties of corundum the single
crystal form of aluminium oxide.
Sapphire and rubies just have different inpurities that impart colour to
the gem.

The microwave loss in single crystal alumina (sapphire, corundum) may be
somewhat lower than for the polycrystalline form.

Bruce

Hi all,

The "Neuchatel MASER" was build by Oscilloquartz in Neuchatel/Switzerland...
Maybe somebody has the full coordinates of that :-)

Oscilloquartz SA, http://www.oscilloquartz.com/
Brévards 16
2002 Neuchâtel
Switzerland
phone : +4132 722 5555
fax : +4132 722 5556

Regards
Karesz

2010/9/1 Magnus Danielson magnus@rubidium.dyndns.org:

I have the coodinates yet too(but not the hight over see):
46.991347,6.913806

regards

2010/9/2 K. Szeker szeker.k@gmail.com:

jimlux wrote:

That won't make pure H2, it will be loaded with water, and
acid fumes.  You will have to apply the same techniques to
clean H2 made that way as you would need to use to clean
welding grade H2.  A nice cryotrap would probably do the
trick.

-Chuck Harris

So, the see of Neuchatel has 429 meter o.NN,
the city of Neuchatel/Neuenburg is on so 430-470m.
Somebody can calculate yet a correction  - if needed/likes...
K.

2010/9/2 K. Szeker szeker.k@gmail.com:

You need a pressure differential across the Palladium plug used to control
the H2 flow into the MASER. At a first glance the 1 Atm seems too low, but
might be enough if you heat the Palladium hot enough. It's an engineering
tradeoff and I've not done the analysis.

Comment: When contemplating something like making a MASER, you want to buy
things off the shelf, if at all possible. I'd buy a Lecture Bottle of H2
and a regulator for $100 or so and move on to the next step. It's not an
exercise in building a working unit on a desert island from sand and
coconut shells.

It may not be a problem where you are, but I should think that
lightning might come to mind.

Do you really want your GPS antenna up very high?

-Chuck Harris

Charles P. Steinmetz wrote:

On 9/2/2010 7:46 PM, Charles P. Steinmetz wrote:

How far up do you need to go?  Do you need to clear dense trees or lots
of adjacent buildings, and if so, how high are they?

If you get about all nearby structure and obstructions you need to start
thinking about lightning protection in a vary serious way.

The definition of heavy snow and ice is very regionally dependent.  I'm
in the DFW are and heavy = any.  I used to live in Laramie and worked on
mountaintop radios where heavy was measured in feet.  Where are you?
Likewise the structure required to support survivability is heavily
dependent on worst case ice load and height.

110 mph/50 m/s isn't that hard for a few feet of pipe clamped securely
to a structure to survive.  Even ice load isn't much of a factor as it's
more structural than load for a small antenna and short pipe at some
point .  Falling ice clears all bets. Literally.

Most of the telecom targeted antennas are made to screw on to 3/4" or 1"
water pipe with the feedline in the pipe.  Typical application is either:

1. A short (1 - 2 foot)  piece of rigid conduit of the correct size
   is fit to the shelter with a sweep bend to feed the antenna
   feedline directly into the building.  These are often not clamped
   at all, though frequently clamped to an eave.
2. A short (1 - 3 foot)  piece is clamped to a larger mast and a
   longer feedline is run into the building.

I suspect you may be over thinking this and a foot or two of pipe on an
appropriately located eave will do fine.  If you need to go on a
chimney, get a chimney strap kit and four feet of pipe sized to fit the
antenna.  Strap it at points two or three feet apart.

--
mailto:oz@ozindfw.net
Oz
POB 93167
Southlake, TX 76092 (Near DFW Airport)

I was just about to suggest a ham antenna tower. The triangular truss
design is very rigid, yet presents low wind loading. I think there are
application notes that help with siting and selection.

Rohn is a very standard and pretty well respected name in the business.
They also have a good selection of accessories. In this area, I see them
at ham fleas on a regular basis.

FWIW,

-John

===============

Hi

There are a lot of chimney mount antenna supports. They should get you up 6 feet above the top of the chimney. Simple to install and pretty cheap.

Bob

On Sep 2, 2010, at 8:46 PM, "Charles P. Steinmetz" charles_steinmetz@lavabit.com wrote:

Picked that one as it fit the 3" wide request and is UPS shippable. The brackets
and ground plate were also available.

Stanley

----- Original Message ----
From: J. Forster jfor@quik.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thu, September 2, 2010 8:25:35 PM
Subject: Re: [time-nuts] Freestanding mast

I was just about to suggest a ham antenna tower. The triangular truss
design is very rigid, yet presents low wind loading. I think there are
application notes that help with siting and selection.

Rohn is a very standard and pretty well respected name in the business.
They also have a good selection of accessories. In this area, I see them
at ham fleas on a regular basis.

FWIW,

-John

===============

time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Hello Charles,

Last September I had some roof work done and I had added 2 each 1-1/2"
vent pipe penetrations just below the ridge.
Now I have a place to add the GPS antenna, either  a hockey puck type or
a more sophisticated one.
The hockey puck was added to a length of PVC conduit to penetrate the gland
The GPS antenna is just level with the roof ridge, for no blockage.

Previously I used a MS-44 aluminum military masting tripod tower to put
the GPS antenna just above the gutter height ~ 11' high.

The rest of your questions I would have to find a PE.

Stan,  W1LE

On 9/2/2010 8:46 PM, Charles P. Steinmetz wrote:

If your nearby houses and obstructions are not high, IE. if the houses
there are single story, you may be able to get away with what I have
done. Instead of fixing something on the house, I've attached a couple
of antenna to the top of one of my washing line poles in the garden as
this faces South (I'm in the Southern Hemisphere) and I get an average
of 7-8 sats every day and up to 12 at night. It makes any maintenance
easy, if you get any snow it is easy to clear at that height, there is
much less windage if your subject to strong winds and, if you don't
use your washing line, the size of the poles make them quite rigid so
you don't suffer a lot of noise that you would high up on a thin pole.
Just a thought.

Steve

On 3 September 2010 12:46, Charles P. Steinmetz
charles_steinmetz@lavabit.com wrote:

--
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.

• Einstein

Stanley wrote:

Interesting suggestion.  Rohn is well known to me, though I don't
typically think of them for things like push-up masts.

For those suggesting 6-10' of pipe, at my rooftop I get a reception
cone of about 50 degrees elevation and above during the vegetated
months (say, mid-March through mid-November), and about 30 degrees
and above in the dead of winter, due mostly to dense tree cover that
is 60-80 feet tall.  So, I'd really need to get 20 feet + above the
chimney (50+ feet above the ground) for a significant
improvement.  The suburban residential lot size doesn't leave me much
to work with (no centrally-located tower, therefore no guys unless I
negotiated easements with the neighbors, and Hell will never be that
cold...).  I doubt I could get a permit for 80' of Rohn 55.  Maybe if
I put a wind generator on it....

Thanks again,

Charles

You could try a box kite,
or a tethered balloon.
An interesting project would be a computer controlled kite
servoed to hold a constant position.
Or a sky hook?
What about a remote site with a radio or laser link to your QTH?
The more ideas that you start with the more likely you will find a
good solution.
cheers,
Neville Michie

On 03/09/2010, at 3:08 PM, Charles P. Steinmetz wrote:

On 3 September 2010 20:48, Neville Michie namichie@gmail.com wrote:

Now that would be be some project.

They are actually making generators which are attached to balloons
that go up into the jet streams to generate electricity. Even a
relatively small unit can produce 2MW so you can make your own energy
at the same time.

You could also attach a nice high gain amplifier to it too, just to
make up for all the loss in the cable hanging down from it :)

Cheers,
Steve

--
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.

• Einstein

Hi

With enough output from a laser you could balance it on the beam. Might bother the neighbors for a few (dozen) miles around.

Bob

On Sep 3, 2010, at 4:48 AM, Neville Michie namichie@gmail.com wrote:

I've tried balloons for HF wire antennas. Unless you can get a serious
balloon (> several feet in diameter) it's essentially hopeless.

-John

=================

Hi

Same thing is true for kites. I have a couple that you tie off to the hitch on an SUV that will do the trick. Small simple kites won't lift a lot of weight or tolerate a lot of added drag.

Bob

On Sep 3, 2010, at 11:14 AM, "J. Forster" jfor@quik.com wrote:

Charles...

Rohn's HDBX series would go to 50 feet, free-standing. It is a real pain to
climb because the braces cross in an 'X' pattern, but is quite sturdy. Two
reasonably fit climbers plus a one person ground crew could put it up in a
few hours once the base is ready. These towers tend to twist more than rock,
unlike Rohn 25, 45, or 55.

For your minimal load GPS antenna, even the BX series would be adequate, but
I don't believe there is a 50 foot version.

Now that I think about it, Rohn sold off all of the various BX series, and
it is now marketed by Thomas & Shelby.

Any piece of tubing you would try to take to 50 feet would likely buckle
under its own weight and length pretty quickly (all of you ME's and physics
majors can correct my terminology and choice of failure modes off list, the
point being that it WILL fall down if you can even get it put up), and would
definitely need to be guyed.

This leads me to another possibility, if money is not a concern. One ham
friend of mine has a 120 foot tower that is based on those tapered lighting
supports you see along the freeways. It is galvanized and consists of three
sections that simply nest for about a 10 foot overlap. Of course, it takes a
crane to assemble. Remember, I said if money is not a concern...but it does
look very nice and serious and professional. Climbing it is not for the
faint of heart, believe me!

Tom Holmes, N8ZM
Tipp City, OH
EM79

https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Tom,

Actually the Rohn HDBX towers went up to 64 feet (not counting any pipe used to
mount the Beams) free standing as I have one.  What happens is the amount of
allowed loading decreases with height.  Just sticking up a GPS antenna would not
overload a HDBX at 64 feet.

You are right about it being a PITA as for climbing.  Each section is only 8 feet
in length but narrows as it goes up.  It is possible with the right base to have
it in a tilt-over arrangement.  Otherwise, it helps to rent a man-lift to do the
assembly if you got the guts to go in one.

Bill....WB6BNQ

Tom Holmes wrote:

Just a thought, as you are in southern hemisphere, wouldn't you see more
birds facing North?

Rob K

-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Steve Rooke
Sent: 03 September 2010 5:32 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Freestanding mast

If your nearby houses and obstructions are not high, IE. if the houses there
are single story, you may be able to get away with what I have done. Instead
of fixing something on the house, I've attached a couple of antenna to the
top of one of my washing line poles in the garden as this faces South (I'm
in the Southern Hemisphere) and I get an average of 7-8 sats every day and
up to 12 at night. It makes any maintenance easy, if you get any snow it is
easy to clear at that height, there is much less windage if your subject to
strong winds and, if you don't use your washing line, the size of the poles
make them quite rigid so you don't suffer a lot of noise that you would high
up on a thin pole.
Just a thought.

Steve

On 3 September 2010 12:46, Charles P. Steinmetz
charles_steinmetz@lavabit.com wrote:

10 feet of 2"

likely to be limited.

--
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.

• Einstein

time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
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and follow the instructions there.

On 5 September 2010 04:42, Rob Kimberley rk@timing-consultants.com wrote:

Oops! I really meant North. Well spotted that man. My satellite
azimuth/elevation chart looks quite typical to text-book style. My
GPSDOs still seem to be recovering from the long power outage caused
by the earthquake here early Saturday morning but the stats seem to be
settling down again. My timing gear and antenna were unaffected but it
sure moved some of the heavy HP instruments that I have piled up on my
workbench and demolished my computer "rack", but luckily everything
seems to be working OK. The only thing that seems to be at fault is my
broadband which is playing up now and I wonder if the telephone lines
have been damaged in some way.

Cheers,
Steve

--
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.

• Einstein

Hi Steve,

On 09/05/2010 10:18 AM, Steve Rooke wrote:

I was about to ask how you New Zeeland time-nuts was doing and affected
by the earthquake.

Cheers,
Magnus

Magnus Danielson wrote:

Along with other North Island dwelling TN's I didn't feel a thing.

Bruce

On 5 September 2010 22:29, Bruce Griffiths bruce.griffiths@xtra.co.nz wrote:

Apparently they felt it up to New Plymouth. I'm glad it did not hit
Auckland as the effects could have been much worse. Down here were
very hardy and a bit of a wobble is nothing :)

Steve

--
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.

• Einstein

Meant to add, my Z3805 always used to report that the antenna hight
was +7.50m (MSL) but now it is saying +6.20 (MSL), if you believe
that.

Steve

On 5 September 2010 23:56, Steve Rooke sar10538@gmail.com wrote:

--
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.

• Einstein

On Sep 5, 2010, at 8:01 AM, Steve Rooke wrote:

That might be something worth investigating.

After all, if it's true, that's not a good trend...

Tom Frank, KA2CDK

Ah, well, Steve's message didn't appear here.

There are several possibilities:

Steve's mast really did sink 1.3 metres.

His continent really did sink 1.3m.

Some bureaucrat adjusted MSL by 1.3m quietly because it would be
politically incorrect to admit that the globe was actually warming.

We have some idea of how time is adjusted for GPS. Does anyone know
how and when MSL is adjusted? I mean, 1.3m is quite a lot.

Bill Hawkins

-----Original Message-----
From: Thomas A. Frank
Sent: Monday, September 06, 2010 7:57 PM

On Sep 5, 2010, at 8:01 AM, Steve Rooke wrote:

That might be something worth investigating.

After all, if it's true, that's not a good trend...

Tom Frank, KA2CDK

Well, Steve has been experiencing a LOT of after-shocks, some of which
are still big enough to move things around and I found I had to grab
hold of my cup of tea to stop it shaking onto the floor last night. In
fact these after-shocks are still opening up new cracks in roads and
causing buildings to fall.

As for my height position, I have run a few surveys but I'm getting
varying readings and I wonder if the after-shocks are messing up the
survey results. The latest one which was during a fairly stable period
was 6.8 MSL.

The mast could have sunk a bit or even this whole area could have done
as I live on reclaimed marsh-land. My Mothers 3 year old house looks
like it has sunk a bit at one and and risen at the other, ie. it looks
like it has tipped slightly as her house is built on a concrete
pontoon.

It wouldn't surprise me if they adjust the height of MSL but I would
have thought they would have moved it the other way in an attempt to
forestall fears of the effects of Global Warming.

Regards from Quake City,
Steve

On 7 September 2010 15:24, Bill Hawkins bill@iaxs.net wrote:

--
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.

• Einstein

Steve,

On 09/07/2010 08:08 AM, Steve Rooke wrote:

I keep wondering if you have not had a change in your multipath
environment. Multipath can cause biases like that...

If things have been dislocated a bit sideways and such, the vector sum
may be quite different...

Cheers,
Magnus

Magnus,

On 7 September 2010 19:49, Magnus Danielson magnus@rubidium.dyndns.org wrote:

I still can't get a stable reading from doing repeated surveys so
something is effecting the readings as they used to come out at 7.5m
MSL reliably. The latest one was 5.4m MSL and I'm having trouble
believing that. As regards a change in multipath, I really don't see
how that could be the case as we have not had any lateral movement of
the immediate surrounding environment and I'm pretty clear of
obstacles to the North as my garden leads onto a wildlife reserve with
hardly any trees nearby.

Cheers,
Steve

--
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.

• Einstein

Yes we do need leap-Centimeters for MSL :-D

Stanley

Some bureaucrat adjusted MSL by 1.3m quietly because it would be
politically incorrect to admit that the globe was actually warming.

We have some idea of how time is adjusted for GPS. Does anyone know
how and when MSL is adjusted? I mean, 1.3m is quite a lot.

Bill Hawkins

-----Original Message-----
From: Thomas A. Frank
Sent: Monday, September 06, 2010 7:57 PM

On Sep 5, 2010, at 8:01 AM, Steve Rooke wrote:

That might be something worth investigating.

After all, if it's true, that's not a good trend...

Tom Frank, KA2CDK

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and follow the instructions there.

Steve Rooke wrote:

You could easily have a displacement of a meter or more..

The  (M7+) Landers earthquake here in Southern California a few years
back had a lateral displacement of 10 meters or so and vertical
displacements of a meter.

If there's any soil subsidence, that would also account for a lot

http://all-geo.org/highlyallochthonous/2010/09/tectonics-of-the-m7-earthquake-near-christchurch-new-zealand/

has a nifty picture: the classic aerial shot of a hedgerow/treeline with
obvious displacement (about halfway down the page)
"New Zealand geologists have already identified a 13km fault trace with
3-4 m of right lateral, strike-slip offset, and variable vertical
movement of up to 1 m. "

Also there was this in a page linked from the above:
Deformation

Portable GPS instruments are planned to be deployed on September 6
(Monday) to re-occupy GPS 40 - 50 sites in the region looking for
changes. GNS scientists will be joined by colleagues from Land
Information New Zealand (LINZ).

A preliminary estimate of the McQueen's Valley (MQZG) co-seismic
displacement is 135 mm at about 300 degrees azimuth. This permanent
receiver is located on Banks Peninsula. This result is consistent with a
magnitude 7.1 earthquake on a vertical strike-slip fault at the location
where the geologists have found surface rupture, but it is only one
point and it would be consistent with many other scenarios as well. We
can expect displacements of 200+ mm at a number of the temporary GPS
stations we are planning to visit, and there is one station in
particular that may be within a few kilometres of the surface rupture
and thus have a much higher displacement.

HI Bill...

Yes, the HDBX version goes that high, it was the base BX that I didn't think
went past 50 feet.

Tom Holmes, N8ZM
Tipp City, OH
EM79

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On

https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

On 8 September 2010 01:23, Stanley Reynolds stanley_reynolds@yahoo.com wrote:

Pilot to co-pilot: Well the instruments say we should have landed by now...

Steve

--
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.

• Einstein

On 8 September 2010 01:38, jimlux jimlux@earthlink.net wrote:

The paragraph that says "The most striking feature of this map is the
section of the Alpine fault in the central South Island that has not
ruptured in the last couple of centuries – which suggests there might
be a fair amount of strain belt up waiting to be released." is quite a
worry for us as they predict we are well due for a significant
movement of the Alpine fault and it will be a major event.

Maybe it's time to move :)

Steve

--
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.

• Einstein

Steve Rooke wrote:

You forgot the canonical next couple lines in the transcript:

Copilot: "what was that?"
<sound of impact>