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May 30th 12, 07:42 AM
posted to rec.radio.amateur.antenna
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Hopefully not off topic
On 28 May 2012 07:39:06 GMT, Rob wrote:
John wrote: Whilst trying to source a "digital" TV antenna I came across some with all external surfaces plastic. One was a small yagi with all external surfaces plastic, hopefully with metal elements embedded. Another a "T" shape made out of plastic conduit with elements inside conduit. My question is how do they work?. If they are detecting electrical fields how does increasing source impedance by 100,s of megohms improve things?. Capacitive coupling, I suppose at the frequencies involved there would be some. If it works as well as all metal why doesn,t every one use it and stop corrosion? Hope this is not too off topic. Many thanks John I think we'll leave this one to mr Bialek to answer... Hahahaa, yes, and it worked :-) w. |
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