Chet Posted August 9, 2022 Share Posted August 9, 2022 Most EMI is picked up by the coil. The coil receives EMI similar to the antenna of an AM radio. The larger the coil surface the more EMI is detected. Proper EMI shielding of the coil is the most critical factor. For a low impedance mono coil the approximate three foot of lead can be a twisted pair of unshielded wires and be very effective in canceling EMI. It does this by the EMI on each wire being balanced and of opposite voltages being introduced by the twisted wires receiving equal and opposing EMI signals. With a Double D coil the low impedance transmit wires are often a unshielded twisted pair. The higher impedance sensitive receive coil is normally connected by a small diameter shielded cable. 3 2 Link to comment Share on other sites More sharing options...
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