NLO crossed-wire antenna. Far-field simulations for 80m
(3.5 - 3.8 MHz)
| Simple dipole feed N and S wires driven. E and W wires unconnected. Model: x45dipole.ez (simulation frequency set to 3.7MHz). |
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Maximum low-angle radiation is broadside to the wire. Pattern can be rotated through 90° by connecting the transmitter to the E and W wires. Shown below: slices through N-S and E-W directions. For radiation at an elevation of 45°, there is a difference of about 18dB (3 S-points) between N-S and E-W. For 80m DX working, operators and worked stations will definitely notice the difference between the two possible pattern orientations. |
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| Splayed dipole feed N and E wires joined S and W wires joined. Model: x45splay.ez (simulation frequency set to 3.7MHz). A more omni-directional pattern is achieved in comparison to the simple dipole configuration. Gain in the vertical direction is unaffected. |
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 Slice through the N-S direction |
| 3+1 Asymmetric feed W, N, and E wires joined. Model: x45_3plus1.ez . Reduces radiation in end-on directions. |
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 Slice through the E-W direction |
| Double-T feed (Top Null) Cancels radiation in the vertical direction. Model: x45_2T.ez (simulation frequency set to 3.7MHz). |
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 Slice through NE-SW |
DWK 2008
