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#8
July 29th 07, 04:13 AM
posted to rec.radio.amateur.antenna
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Request EZNEC computation
Owen Duffy wrote in
: "Jerry Martes" wrote in news:ScTqi.3733$8u1.2359@trnddc07: "Ed" wrote in message 92.196... This is the first time I've done this. If the need arises again, I'll have to download and try EZNEC, I guess. Meanwhile, I am concerned about the efficiency of our ARES Command Center HF antenna system. Could someone please advise me what feedpoint SWRs would be seen on a wire antenna, 15 feet above a flat metal roofed building, (it a NVIS antenna), and resonant at 6.2 MHz. It is operated at 3.98 MHZ, 5.4 MHz, and 7.2 MHz The 100 watt radio has one of those built in tuners that can only handle 3:1 SWR. I suspect we are terribly inefficient. Jerry, are you saying that your model suggests the Z~=72+j0 at resonance, and the half wave dipole is ~0.1m above a perfectly conducting plane. It doesn't seem right. That should read "0.1 wl above..." |
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