Maser manual
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:
On 5 September 2010 22:29, Bruce Griffiths bruce.griffiths@xtra.co.nz wrote:
Magnus Danielson wrote:
Hi Steve,
On 09/05/2010 10:18 AM, Steve Rooke wrote:
On 5 September 2010 04:42, Rob Kimberleyrk@timing-consultants.com
wrote:
Just a thought, as you are in southern hemisphere, wouldn't you see more
birds facing North?
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.
I was about to ask how you New Zeeland time-nuts was doing and affected by
the earthquake.
Cheers,
Magnus
Along with other North Island dwelling TN's I didn't feel a thing.
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
Bruce
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--
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.
- Einstein
--
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:
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
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:
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
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:
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:
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
That might be something worth investigating.
After all, if it's true, that's not a good trend...
Tom Frank, KA2CDK
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.
--
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:
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.
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:
Steve,
On 09/07/2010 08:08 AM, Steve Rooke wrote:
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.
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...
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
Cheers,
Magnus
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--
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
<snip>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:
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
That might be something worth investigating.
After all, if it's true, that's not a good trend...
Tom Frank, KA2CDK
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.
Steve Rooke wrote:
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.
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
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.
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
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
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of WB6BNQ
Sent: Friday, September 03, 2010 9:38 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Freestanding mast
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:
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
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]
On
Behalf Of Charles P. Steinmetz
Sent: Friday, September 03, 2010 1:08 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Freestanding mast
Stanley wrote:
ROHN 9H50 34 Foot Telescopic TV Wireless Antenna Push Up Mast
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
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On 8 September 2010 01:23, Stanley Reynolds stanley_reynolds@yahoo.com wrote:
Yes we do need leap-Centimeters for MSL :-D
Pilot to co-pilot: Well the instruments say we should have landed by now...
Steve
Stanley
<snip>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:
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
That might be something worth investigating.
After all, if it's true, that's not a good trend...
Tom Frank, KA2CDK
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.
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.
--
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.
- Einstein