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Old April 22nd 07, 07:53 PM posted to rec.radio.amateur.antenna
Jerry Martes Jerry Martes is offline
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First recorded activity by RadioBanter: Jul 2006
Posts: 173
Default Where does the far field start on a phased array?







"Dave (from the UK)"
wrote in message ...
Jerry Martes wrote:
Hi Dave

Would you consider building a scale model of this array to allow a
polar orbiting satellite to be the illuminator?


It's not really practical to do that for various reasons. The structure is
not a nice conventional antenna that can be scaled up/down size.

I get some pretty good radiation pattern plots at VHF, using Patrik
Tast's SignalPlotter program and NOAA satellites.

Jerry


That's a concept I have not heard of before. But for me to work at VHF,
I'd need to make the structure larger by a factor of 10, so it would be
several hundred metres long.


--
Dave (from the UK)


Hi Dave

You are not restricted to VHF. It is possible that there is a polar
orbiting satellite transmitting continuously on the frequency you are
interested in. NOAA satellites transmit continuously at about half the
frequency range you refer to.

Jerry