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#9
June 21st 09, 02:38 AM
posted to rec.radio.amateur.antenna
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Horizontal Dipole - zero degrees elevation
Frank wrote:
NEC will calculate "Space wave plus surface wave" if required. Frank Have you tried doing this calculation with a horizontally polarized VHF antenna? What did you find? Roy Lewallen, W7EL As an example I tried the following: CM Horizontal Dipole CE GW 1 11 0 0 3 0 1.5 3 0.01 GE 1 -1 0 GN 2 0 0 0 13.0000 0.0050 FR 0 1 0 0 100 1 EX 0 1 6 0 1 0 RP 1 1 360 0000 3 0 1.00000 1.00000 10000 EN At 10,000 meters, 3 meters off the ground: E(theta) is maximum off the ends at 3.5E-8 V/m E(phi) is maximum off the sides at 2.6E-7 V/m This agrees with the expected horizontal polarization off the sides, and vertical polarization off the ends. Frank, VE6CB Now what's the result without the surface wave? Roy Lewallen, W7EL |
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