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Does a j pole need grounding and/or a balun?
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January 7th 05, 07:10 PM
Dan Richardson
Posts: n/a
On 07 Jan 2005 12:50:05 EST,
am (Gary V.
Deutschmann, Sr.) wrote:
RF is invisible to whatever lies below the Horizontal Member, so
whether the mast is grounded or not would have no impact on the
J-Poles performance.
NEC anylisis I've done doesn't not show that to be true. A j-pole
directly connected at its base to a conductive mast will increase
higher takeoff angles. The worst case is with mast lengths of even
½-wavelengths. With mast lengths of odd ¼-wavelengths produce less,
but, in ether case connecting a j-pole to a conductive mast will
increase high angle radiation patterns.
Danny, K6MHE
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