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KD0ZYA
PostPosted: Mon Aug 18, 2014 12:29 pm 
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Joined: Sun Aug 03, 2014 5:33 pm
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Any real advantage one over the other?
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KD0ZYA
PostPosted: Tue Aug 19, 2014 5:20 pm 
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Not sure
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Rich
PostPosted: Tue Aug 19, 2014 6:18 pm 
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Posts: 1997
All the ones I have built and all the ones I've seen are open top stub. There really is no point in a closed top stub as the impedance at that point is so high that no useful current would flow if you are using it near the designed frequency. If you are worried about rigidity to maintain antenna dimensions/resonance then close it with something nonconductive. I used PVC for this on my J-poles.
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KD0ZYA
PostPosted: Wed Aug 20, 2014 8:51 am 
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Thanks. I was referring to the open stub similar to one made by Arrow. Ever use one?
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Rich
PostPosted: Wed Aug 20, 2014 9:52 am 
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No. I've always built the jpoles I've used.
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KE7JFF
PostPosted: Wed Aug 20, 2014 3:38 pm 
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Location: Portland, OR
I have the Arrow J-Pole....its works pretty well and I think beats my Diamond X-50 sometimes.

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