V3I/TDI PRO

[supafly136]

ok, im indiana with pretty good soil.

i took a morgan dollar and planted it at the edge of a corn field at EXACTLY 14 inches. i could get a weak signal with a new v3i in deep silver mode, and tx boost on. gain was kinda high, dont remember exactly.

now, if i took a brand new TDI PRO set up in All, with decent gain and gb, could i detect that exact same coin at that depth?

also, my biggest question, can i detect it even deeper with the pro?


p.s. no trash, no emi, perfect conditions for both machines, stock coils.

 

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[U.K. Brian]

I don't know the size of a Morgan dollar but you should be able to equal the depth of the V3 with the TDI on a target you know is there but you are more likely to overlook it with a pulse machine if there's any metal fragments (not trash as such, as so small other detectors would appear to ignore them) in the surrounding soil.

If you said the ground had bad mineralisation then the advantage would be with the TDI.

In good/mild soil many VLF's in all metal will match pulse machines and you have the advantage of flicking into a true discrimination mode if you want to.

 

[supafly136]

thank you very much for the reply.

maybe you can give me your opinion on this also.

why is it that i see so many larger square coils being used on the p.i. machines and not the vlf machines?
ive read that the square coils go deeper for larger items (with the loss of smaller targets). is it that vlf technology doesnt allow it or maybe it depends on the raw power available in a particular machine? i know the minelab gpx series will go deeper than any vlf and other types of p.i. machines. but to be honest, if i could get a machine that would go 4 ft on a single coin AND get the larger stuff up to that depth, i would be more than happy to haul around a 15lb control box on my shoulders. of course some target id would be nice to avoid diggin 30 4ft holes in a row for junk.

 

[U.K. Brian]

Eric Foster, the designer of many of the pulse machines on the market, told me many years ago that square coils worked better on pulse detectors but there's resistance amongst uses to the shape and corners on squares can be a real pain in undergrowth for instance.

In general all large coils lose sensitivity if the coil is large. Doesn't matter if round or square. I don't think there's many VLF's that will handle very large coils as they are so much more affected by ground effect. Ground balance controls appear to do away with mineralisation but don't really deliver what they promise as the negative effects still remain though the wanted targets are better able to be heard from the background noise.

 

[supafly136]

thank you for the info U.K. Brian.

my girlfriend and i will mostly be hunting plowed farm fields for coins and meteorites. so ill just have her go in front of me with the v3 and a medium sized coil and ill get the tdi pro with a 20x20 square coil. that way she will be covering the first foot of depth and ill make up the rest behind her to 3 or 4 feet.

i found a great site that allows you to overlay very old maps onto google earth images. it shows where old homes used to be and a lot of those are in the middle of farm fields. seems to be free so far.youve probably heard of it but heres a link for anyone whos interested. just a matter of getting permission after that.

http://www.historicmapworks.com/