Originally posted by bbsailor
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When the copper fabric shielded coil was working it was giving identical ranges to the subsequent Scotch 24 shielded one. The former one is fine when the room temperature drops to 50C or below. Above that, the Vallon shows a coil fault and won't work. It may be a capacitance change caused by temperature. The resonant frequency is lower than the stock Vallon coil anyway, so maybe the detector senses that. I am now winding a third coil using Teflon insulated 7/0.2 which I hope will push the resonant frequency up to be nearer the stock coil.
Eric.
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