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I'm an end user and have one on my MXT the 12x15 but would like opinions on the technical merit of such coils please.
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Thought this was a tech site
Deathly silence -
Most detectors rely on a good induction balance between TX & RX coils; the better the balance, the better the sensitivity. Ground mineralization compresses the TX field which couples into the RX coil and screws up this balance.
Theoretically, the coil design with the best natural ground rejection will have round TX & RX coils that overlap like a DD coil. I call this a "OO" coil. By making the coils round, field compression is symmetrical and consistent, resulting in little coupling.
DD coils do a pretty good job, but not as good as round coils because the sharp bends in the D result in concentrated field points. Since the TX field is not symmetrical and consistent, its compression won't be, either.
The SEF coils are in-between. The coils are oval, not round (00 instead of OO), so the small radius ends will have a somewhat concentrated field, but not as bad as a sharp bend on a DD. So the SEF will have a little bit better natural ground rejection than a DD, but not quite as good as a true OO.
- CarlComment
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