Why does the Tejon deal so well with the "skin effect"?

[jbow]

The skin effect is more surface area... you can test your detector with silver dollars and probably with other coins but i've only tried it with Morgans. One SD will, on every machine, read as what it is BUT if you stack four or five of them it will, on most machines read as junk... not on the Tejon, it will still hit hard with the disc wide open... I think it is the only machine I have that will do it... all the others read a stack as trash.

Why does the Tejon still read a stack of Morgans as a coin while most other detectors read the stack as junk? Anyone know?

This always bothers me... I always wonder what sort of reading I would get from a roll of silver dollars or silver quarters using another machine... junk?

J

 

[Hombre]

jbow

Why ask why, just be happy that the Tejon performs so well. I did a test out in my freshly plowed wheat field one time with a mason jar full of clad, using a Tesoro Toltec ll and a White's XLT. I buried the jar full of clad coins a full 12 inches deep and on both detectors I got a "dollar" reading and real strong signal with the coil raised a full two feet above the buried mason jar, The jar had a mix of zincs,copper pennies, clad dimes, quarters and nickels. At least I know that if I'm in an area where I can dig in privacy and get a signal like that.........I'm going for it

 

[jbow]

Thanks for that info though.. see, I might have passed that by thinking it was a big piece of aluminum or some other trash... especially in an area what is a bit trashy. The more I think about it the more I think I want to go back to a machine with no screen and learn to hunt audio alone... still if I got a high tone and I still got it with the coil a foot off the ground, i'd more n likely pass on it... i'll have to re-think it now...

I'd still like to know why the Tejon reads a stack od Morgans as a dollar and all my other machines read it as junk... Does the skin effect up average a TID? Using nickels, the more I stack the higher the number gets... maybe the dollar, already being high on the phase actually increases and passes over into a placewhere it appears negative on the phase.. like if it goes above 95, could it wrap around to a lower number the way some iron wraps around to read like a high number... maybe that is it. Maybe the Tejon does not allow anything at the high end to wrap around to read as a low number... but that is only a guess.

Of course a jar of mixed coins wouldn't produce a skin effect.. I think they would have to be all the same composition and stacked...

J

 

[jbow]

http://en.wikipedia.org/wiki/Skin_effect

So if I read this right a stack of Morgans becomes a resistor.. that answers why a detector would give a lower reading but not why the Tejon dosen't when the others do.

J

 

[Hombre]

jbow

I hunt around old farm houses that date back to the late 1800's, I have'nt found that cache yet, but I know what a jar full of coins will sound like. In places like these,you can dig these sorts of signals without raising eyebrows..........now if I was detecting in someone's nice old victorian yard, I would have to pass on a signal like that or talk to the land owner. I have'nt tried a stack of coins yet, but someday I'll have to do it to satisfy my curiosity. Are you actually digging a hole to bury the stack of coins or is this an "air test"......just curious......but I think ground effects might have a different outcome. I have a book someplace in the house put out by White's a long time ago(1985?), I believe it's called "Everything you wanted to know about discrimination" by Robert Brockett or something like that, my poor memory. It contains some information on the White's 6000 Di Pro series 2 or 3 I forget, but he notes that the 6000 would read four quarters stacked as a "dollar". Something to do with more mass to the target. This book would be a good read for you if you could find it.

Randy

 

[Monte]

One SD will, on every machine, read as what it is BUT if you stack four or five of them it will, on most machines read as junk... not on the Tejon, it will still hit hard with the disc wide open... I think it is the only machine [size=large]I have[/size] that will do it... all the others read a stack as trash.

I presume this is an "air test" but i don't know which "OTHER" detectors you have or what their settings are/were. That, alone, can make a difference in how the detectror performs.

Later this evening I'll post again.

Monte

 

[tvr]

Monte,
Jbow lists his detectors in his signature block.

Looking forward to more of your thoughts on this one.
Cheers,
tvr

 

[jbow]

I tested them a while back and used my regular settings, just regular hunting settings, minimal disc no notching.

Also, air test, stacked face up.

Not a big deal, I was just wondering about it. IIRC, most coins give a higeer VDI when stacked but silver dollars read lower, I assume they wrap around to a lower reading. I don't expect to find stacked silver dollars but you never know.

Just curious...

J

 

[Ism]

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