Advice on sighting a roof mounted gps area please
Hi All,
I am building a house extension and part of the works involves adding a
new hip roof made of corrugated iron. I was thinking I would pass a
50mm pvc pipe through the roof with a tee and then mount two conical gps
timing antennas on top of it. I am in a low point and don't have
visibility of the horizons ( I'm not in the out-back).
My question is should I mount on the peak of the roof? How close can I
mount two antennas from each other? Can they interfere with each other?
I am also in the midst of some tall trees - although my new roof will be
pretty high it will still be below the tallest trees.
Of course the main reason for this is I want to do some accurate timing
ASCII art of proposed set-up
A A
| |
|
|
^
/ \
/ \
/ roof \
Thanks for your advice
Tim
Tim
The antennas should not interfere with each other due to rf leakage because
of the way the systems are designed. I will believe you are using 2 rf
feeds.
The more you can clear the trees the better. My very simple solution is a
90' tower.
A bit of humor it does have other uses.
Regards
Paul
WB8TSL
On Sun, Oct 12, 2014 at 7:34 AM, swingbyte swingbyte@exemail.com.au wrote:
Hi All,
I am building a house extension and part of the works involves adding a
new hip roof made of corrugated iron. I was thinking I would pass a 50mm
pvc pipe through the roof with a tee and then mount two conical gps timing
antennas on top of it. I am in a low point and don't have visibility of
the horizons ( I'm not in the out-back).
My question is should I mount on the peak of the roof? How close can I
mount two antennas from each other? Can they interfere with each other? I
am also in the midst of some tall trees - although my new roof will be
pretty high it will still be below the tallest trees.
Of course the main reason for this is I want to do some accurate timing
ASCII art of proposed set-up
A A
| |
|
|
^
/ \
/ \
/ roof \
Thanks for your advice
Tim
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First off, why only 50mm and why plastic? The PVC will degrade in the
sunlight over the years. Use galvanized iron pipe. Make the mast as
tall as you can. It can extend sever feet below the roof and attach to
house structure using u-bolts. (Hight limited only by appearance from the
street.) Using iron pipe strength will not be an issue. Run the cable
inside the iron pipe to the attic space.
I would use two masts, one for each antenna. It will look better and be
easier to build and it will handle high winds better.
If you are worried about how this all looks use some spray paint to make it
either sky blue or light grey.
Do you need two antenna? You can feed multiple GPS receivers using a
splitter and amplifier from one antenna.
Be sure to follow the local rules for grounding antenna. In most places
you will need a heavy coper wire leading directly to a grounding rod. You
want to give lightening an easy path to ground that is not routed through
the interior of the house.
On Sun, Oct 12, 2014 at 4:34 AM, swingbyte swingbyte@exemail.com.au wrote:
Hi All,
I am building a house extension and part of the works involves adding a
new hip roof made of corrugated iron. I was thinking I would pass a 50mm
pvc pipe through the roof with a tee and then mount two conical gps timing
antennas on top of it. I am in a low point and don't have visibility of
the horizons ( I'm not in the out-back).
My question is should I mount on the peak of the roof? How close can I
mount two antennas from each other? Can they interfere with each other? I
am also in the midst of some tall trees - although my new roof will be
pretty high it will still be below the tallest trees.
Of course the main reason for this is I want to do some accurate timing
ASCII art of proposed set-up
A A
| |
|
|
^
/ \
/ \
/ roof \
Thanks for your advice
Tim
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.
--
Chris Albertson
Redondo Beach, California
Hi
If you are going to get any benefit from multiple antennas, you want to space them as far apart as possible. You are better off with one antenna and a splitter than with two close spaced antennas.
The cost of mucking around on the roof is non-trivial. The world is headed to L1/L2 operation on GPS and similar systems. Invest the money in one good antenna and mount rather than multiples.
Bob
On Oct 12, 2014, at 10:19 AM, paul swed paulswedb@gmail.com wrote:
Tim
The antennas should not interfere with each other due to rf leakage because
of the way the systems are designed. I will believe you are using 2 rf
feeds.
The more you can clear the trees the better. My very simple solution is a
90' tower.
A bit of humor it does have other uses.
Regards
Paul
WB8TSL
On Sun, Oct 12, 2014 at 7:34 AM, swingbyte swingbyte@exemail.com.au wrote:
Hi All,
I am building a house extension and part of the works involves adding a
new hip roof made of corrugated iron. I was thinking I would pass a 50mm
pvc pipe through the roof with a tee and then mount two conical gps timing
antennas on top of it. I am in a low point and don't have visibility of
the horizons ( I'm not in the out-back).
My question is should I mount on the peak of the roof? How close can I
mount two antennas from each other? Can they interfere with each other? I
am also in the midst of some tall trees - although my new roof will be
pretty high it will still be below the tallest trees.
Of course the main reason for this is I want to do some accurate timing
ASCII art of proposed set-up
A A
| |
|
|
^
/ \
/ \
/ roof \
Thanks for your advice
Tim
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.