On Wed, 01 Aug 2007 04:51:53 GMT, "Jerry Martes"
wrote:


"Jerry Martes" wrote in message
news:coTri.7566$yg1.763@trnddc04...
Hi Steve

It is fairly easy to record exact radiation patterns of "2 meter"
antennas at 137 MHz, using NOAA satellites at the Illuminator. If you
have any interest in the details, you can contact me anytime.
Patrik Tast developed a (free) program for me that produces elevation
plane patterns of the antenna as the NOAA satellite passes over. Since
each satellite passes over 6 or 8 times per day, decent hemispheric
patterns can be made.
I'd guess that the plot of the antenna pattern, when using Patrik's
program is more accurate than any other method when evaluating ground
based "2 meter" antennas. I am open to learning where I'm wrong about
the accuracy.

Jerry

Examples of the radiation pattern data that can be acquired with Patrik
Tast's SignalPlotter program can be seen on one of his sites
http://213.250.83.83/~patrik/apt/log...22-2007/daily/

I have used this SignalPlotter program to make radiation pattern plots by
recording rssi voltage with a simple voltmeter with a RS232 connection and
with LabJack data recorder.

Jerry


Hi Jerry,

Very good sources of information.

73's
Richard Clark, KB7QHC