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| To: | <[email protected]> |
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| Subject: | LF: RE: DLF passive received with earth antenna |
| From: | "James Moritz" <[email protected]> |
| Date: | Wed, 14 Jul 2010 14:49:19 +0100 |
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| In-reply-to: | <BF4A524700075746A6467658DFC7102C51094D0E44@ICTS-S-EXC2-CA.luna.kuleuven.be> |
| References: | <[email protected]> <[email protected]>,<[email protected]> <BF4A524700075746A6467658DFC7102C51094D0E37@ICTS-S-EXC2-CA.luna.kuleuven.be>,<[email protected]> <BF4A524700075746A6467658DFC7102C51094D0E44@ICTS-S-EXC2-CA.luna.kuleuven.be> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
Dear Stefan, LF Group, The EMF induced in a small loop is: V = 2.1e-8 * fNAE f = frequency N = no. of turns A = areaE = Electric field strength V/m (this assumes E/H = 377ohms, i.e. not near field) This will be the voltage you measure, assuming negligible loading. As Rik says, the ratio of voltages at a given frequency will be equal to the ratio of loop areas - this holds provided the loops are a small fraction of a wavelength in perimeter. With multi-turn loops, there may be errors caused by distributed capacitance, etc., but probably not a significant problem at VLF. Depending on the ground resistance and so on, this "earth antenna" might also act as an E-field antenna, or combined E-field / H-field antenna, like the K9AY and other "resistively terminated" loops. In this case, one would expect a different signal voltage at each end of the loop. Cheers, Jim Moritz73 de M0BMU |
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