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| open stub j pole 2m/70cm v. j pole http://interceptradio.com/bbs/viewtopic.php?f=3&t=7713 |
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| Author: | KD0ZYA [ Mon Aug 18, 2014 12:29 pm ] |
| Post subject: | open stub j pole 2m/70cm v. j pole |
Any real advantage one over the other? |
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| Author: | KD0ZYA [ Tue Aug 19, 2014 5:20 pm ] |
| Post subject: | Re: open stub j pole 2m/70cm v. j pole |
Not sure |
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| Author: | Rich [ Tue Aug 19, 2014 6:18 pm ] |
| Post subject: | Re: open stub j pole 2m/70cm v. j pole |
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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| Author: | KD0ZYA [ Wed Aug 20, 2014 8:51 am ] |
| Post subject: | Re: open stub j pole 2m/70cm v. j pole |
Thanks. I was referring to the open stub similar to one made by Arrow. Ever use one? |
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| Author: | Rich [ Wed Aug 20, 2014 9:52 am ] |
| Post subject: | Re: open stub j pole 2m/70cm v. j pole |
No. I've always built the jpoles I've used. |
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| Author: | KE7JFF [ Wed Aug 20, 2014 3:38 pm ] |
| Post subject: | Re: open stub j pole 2m/70cm v. j pole |
I have the Arrow J-Pole....its works pretty well and I think beats my Diamond X-50 sometimes. |
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