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I coined that term and started relying on that technique back in the '70s.

May 29, 2019 09:49AM avatar
I used both Double-D coils back then as well as Co-planer / Concentric types, and it is usually a lot easier to use 'EPR' techniques with a Concentric coil, and especially easier with a smaller-size coil. Something in the 5" to 7" diameter. The DD coils often need to be worked a bit more 'off-the-edge' of the coil while a Concentric type can often start to respond within an inch in from the outer edge

Also, the problems with DD coils are two fold. One is that they might require working the coil more to the front or to the rear to get the EPR effect, plus many DD coils for todays detectors are bigger-size. In the 9" to 11" diameter, and in an iron plagued site, such as a lot of bottle caps in old picnic groves, etc., those bigger coils might get worked back or forward and encounter one or more other pesky Bottle Caps and defeat the ability to audibly classify that problem trash.

Most places where Bottle Caps are encountered, they are either on or near the surface or down to maybe 2"-3", and with the right detector and coil and technique, I can audibly classify ±90% of those I encounter.

Monte

"Your EYES ... the only 100% accurate form of Discrimination!"

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Subject Author Views Posted

XP Deus/ORX Identifying Bottle Caps

Kickindirt 175 May 28, 2019 08:43PM

Re: XP Deus/ORX Identifying Bottle Caps Attachments

Remfire 104 May 28, 2019 10:50PM

Re: XP Deus/ORX Identifying Bottle Caps

Kickindirt 123 May 28, 2019 11:38PM

Re: XP Deus/ORX Identifying Bottle Caps

Remfire 87 May 29, 2019 06:25AM

I coined that term and started relying on that technique back in the '70s.

Monte 81 May 29, 2019 09:49AM

Identifying Bottle Caps Attachments

UtahRich 118 May 28, 2019 09:13PM

Now, that was a good early morning chuckle. N/T

Monte 75 May 29, 2019 09:37AM

Re: Now, that was a good early morning chuckle.

Kickindirt 73 May 29, 2019 10:26AM

Re: Identifying Bottle Caps

Kickindirt 80 May 28, 2019 09:20PM



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