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Coins on edge... a lesson learned.

A

Anonymous

Guest
Guys,
Now what I'm about to tell you was a revelation to me but I'm sure is old news for the experienced detectors out there.
In my air testing of my 3D, I did a few other tests to try things out. I stuck a coin straight up and down into the ground. Much to my surprise when I scanned the coin perpendicular to my sweep I heard a double beep. When I turned 90 degrees and my sweep was parallel to the coin, it vanished. I went back to perpendicular to the coin and pinpointed the coin and I was way off. I could see the imprint of my finger in the ground where the coin was. I could also pinpoint it from the other side. The coin laid between the 2 beeps and between my 2 pinpoints. After thinking about this, it made perfect sense as the signal is bouncing off of either side of the coin.
This is a subject that I have seen rarely covered in print and I've read a lot in the last year about MD'ing. I used this knowledge yesterday to find 2 coins that I know I would have missed prior to this test. I highly recommend to everybody to try this out and learn how it works with your machine. I'm sure I've missed numerous coins by not knowing this. I hope by mentioning it here, it will help another newbie like myself.
Dave
 
Hey Dirtdigger, Your post appears to be very informative. But, I'm alittle confused about the double beep, that you are talking about. When you say double beep, do you mean back to back beeps, such as beep-beep. Or do you mean a beep, slight pause, then another beep, such as beep----beep. I hope my question is not too confusing. Many thanks, hh, NamVetLesTreasureSeeker
 
That all depends on how fast you're swinging and how big your coil is I guess. I would say it more is like beep-pause-beep than just beep-beep. Is that too.. technical?? <img src="/metal/html/lol.gif" border=0 width=15 height=15 alt=":lol"> The pause is when you're over the coin.
The best way is to try it out for your self with your detector. You'll see what I mean once you do it. I know it shocked me when I did it.
Dave
 
Thanks Dave, I never thought about doing it, I associate the double beep mostly to a nail. I will have to play with that on my CZ7A Pro. Thanks for the info. HH
 
I will turn my coil up on edge and pin-point. Try it, you might like it. If I get a weak double signal,.. I might wind up diggin' in a semi-circular pattern until the center becomes apparent. I'm sure there are several ways to deal with a coin on edge. Like to hear more.
 
thegoldenolde.com
Norman has some great advice somewhere in his pages about this issue, I just can't seem to find the exact page.
 
I found in one of his essays, he mentions the double beep. He said that the deeper the coin, the longer the space between the beeps would be. He's got some good stuff on there. <img src="/metal/html/clap.gif" border=0 width=20 height=30 alt=":clap">
Thanks,
Dave
 
yup, reaallllly good site. too bad the man has passed on.
 
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