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Magnetic Loops
In message , bilou
writes "Brian Howie" wrote in message ... I've a 5 foot Octagonal loop for MF. The shield is copper water pipe, with a gap , 7 turns inside plus a coupling winding. It does a good job eliminating local noise (mostly ASDL hash from the phone lines) compared with a vertical. However the capacitance between the shield and turns seems to load it quite a bit meaning I can't get the tuning range I'd like. Brian GM4DIJ -- Brian Howie Hi My own experience is that ,at least for receive, multi turn loops are useless. Instead you can use a single turn one with a good coil in serial. The tuning range for a given variable capacitor is much greater especially if ,at low frequency, the coil is using ferrite . Switching the coil can increase the tuning range easily. The coil, with a secondary winding,is also very useful to adjust the coupling to the receiver. I'd have thought I'd get a better signal from more turns, but maybe better coupling and a higher Q from your suggestion would do the same. Brian -- Brian Howie |
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