Originally posted by Koala
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Looks like Rx or TX phase is reversed because of reversed pins or leads.
Both coils inside search head must maintain same winding orientation and plane. "Start" and "End" of windings must be somehow marked to avoid confusion.
Simplest check for this (without taking it outdoor on grass) is knocking on coil enclosure; if it is producing short responses: it is not wired properly.
If it remains silent on knocking; it is wired properly.
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