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Near field vs Far field measurements at 2M
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 |
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