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| To: | <[email protected]> |
|---|---|
| Subject: | Re: LF: ERP estimation |
| From: | "James Moritz" <[email protected]> |
| Date: | Sun, 1 May 2011 12:53:38 +0100 |
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Dear Pete, LF Group, There must be some software written that does this? You can use NEC-based antenna simulation software (EZNEC, etc.) to obtain Rrad for your antenna, by running an "SWR plot" using perfect conductors and perfect ground. The resistive component of the antenna impedance given by the simulator is then equal to the radiation resistance, since there are no other sources of loss. This is quite useful for more complicated antenna configurations with multiple wires, elevated feeds, etc., but for most simple wire antennas, just calculating Heff as the average height of the wires gives nearly the same result, and like Andy says, it is easier and quicker just to use a calculator. Cheers, Jim Moritz 73 de M0BMU |
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