And the Andrew , Motorola and Pansonic have patches....
Brooke Clarke wrote:
Hi Brian:
The Lucent bullet antenna has a quad helix antenna structure, photos at:
http://www.prc68.com/I/DAGR.shtml#Ant and scroll down,
or maybe faster go to:
http://www.prc68.com/I/DAGR.shtml#DC
and scroll up.
Have Fun,
Brooke Clarke
http://www.PRC68.com
Brian Kirby wrote:
Dr. Clark passed on a tip that I used. Put the funnel in a microwave
oven and run it and see if the funnel warms up. If it warms up, you
do not use it. I do not know what type of plastic the funnel was
made out of; it was white, semi-transparent.
There were also comments about surveying and timing antennas. If you
investigate about every national timing laboratory uses choke ring
antennas. Some enclose the antenna unit and they temperature control
it. They do this for timing stability reasons.
The commercial timing antenna is bullet shaped and is operated
without a ground plane. They are patch antennas. When there is not
ground plane, the antenna picks up best from the overhead and less
towards the horizon. These antennas usually have a lot more gain
(30-50 db vs most normal antennas in the 15-25 db range).
Also in surveying, we cut off the horizon at 15 degrees in software.
A free Army Corp of Engineering manual on GPS Surveying is at
http://140.194.76.129/publications/eng-manuals/em1110-1-1003/toc.htm
The main difference in surveying and timing is in surveying they use
the carrier phase method, were in timing most use a solution derived
from the processing of the coarse acquisition code, in were the
receiver is in a fixed over-determined position . Some timing labs
are using carrier phase method, when they need more resolution.
Brian - KD4FM
Bob Camp wrote:
Hi
Any idea what the funnel was made out of? Some plastics aren't real
great at
microwaves...
Bob
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