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#1
October 19th 09, 05:29 PM
posted to rec.radio.amateur.antenna
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Antenna Pattern: Carolina Windom
Michael Coslo wrote:
wrote: Thoughts? Maybe time to download EZnec? The OCF antenna can work very well. I put one up once because the place where the coax dropped was really handy to my shack entrance. It worked "well". I did some QRP into California on 80 meters during a contest, and I worked what I heard. That doesn't specifically mean that the antenna performed well, but it does mean that I worked QRP into California on 80 from the middle of PA. How will you model the radiating feedline? I suppose one could just put a "wire" in the model to represent the coax shield (which is what radiates) and tie it to something useful. Someone's probably figured out what the equivalent impedances are for the "isolator" and "balun" that form part of that antenna. Maybe googling "NEC model Carolina Windom" might turn up something useful. |
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#2
October 19th 09, 07:05 PM
posted to rec.radio.amateur.antenna
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Antenna Pattern: Carolina Windom
Jim Lux wrote:
Michael Coslo wrote: wrote: Thoughts? Maybe time to download EZnec? The OCF antenna can work very well. I put one up once because the place where the coax dropped was really handy to my shack entrance. It worked "well". I did some QRP into California on 80 meters during a contest, and I worked what I heard. That doesn't specifically mean that the antenna performed well, but it does mean that I worked QRP into California on 80 from the middle of PA. How will you model the radiating feedline? I suppose one could just put a "wire" in the model to represent the coax shield (which is what radiates) and tie it to something useful. Someone's probably figured out what the equivalent impedances are for the "isolator" and "balun" that form part of that antenna. Maybe googling "NEC model Carolina Windom" might turn up something useful. That's pretty much what I would do re the wire. I suspect that the pattern would be complex in any event. Richard was closest to correct when he advised to listen to the manufacturer. At first blush, I would think that the antenna is probably not far from omnidirectional, but the horizontal component might skew it a bit. Any rate, I don't think that his issues with working EU are antenna related. - 73 de Mike N3LI - |
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