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#27
September 14th 10, 05:10 AM
posted to rec.radio.amateur.antenna
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Cecil, was it you that mention a "windom balun?"
On Sep 13, 5:19 pm, Owen Duffy wrote:
The NEC model I posted shows that a 1k isolator (common mode choke) is not effective for that purpose. Here's a model of a Carolina Windom on 20m with a 2k choke (isolator) 20 feet down the coax from the antenna feedpoint at a height of 50 feet. The maximum current on the coax braid above the isolator is 0.72 amps. The maximum current on the coax braid below the isolator is 0.14 amps. The radiation pattern is close to the advertised one for 20m. http://www.w5dxp.com/carwin20.JPG -- 73, Cecil, w5dxp.com |
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