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Like New White's Bigfoot Coil Only $525!


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Steve,

Based on his post ( Jan. 8 ), this one has Deft Tones name written all over it !!!

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Yeah, but he wants one that is V-rated, and no BigFoot coil is V rated except by accident.

When you make an induction balance metal detector coil you have to null the coils. Induction balance infers two coils, a transmit and a receive coil, in a state off electrical balance, achieved by nulling the coils both by proper positioning and through tuning. A single frequency coil you only need to null to one frequency. A DFX BigFoot coil is nulled to 3 kHz and 15 kHz. The V3i runs at 2.5, 7.5, and 22.5 kHz. The null is working for 2.5 and 7.5 kHz but not at 22.5 kHz except by pure accident. This is usually seem by target VDI numbers tripling on the 22.5 kHz frequency when a DFX BigFoot is employed on the V3i. 2.5 kHz and 7.5 kHz single frequency work fine, but 22.5 single frequency and multifrequency modes exhibit odd behavior. Silver coins can read so high as to wrap around into the ferrous range. It can be a "feature" also as the low conductive range gets expanded. I have seen it claimed aluminum tends to respond differently than gold due to the 22.5 kHz being out of null but I have to admit to being skeptical on that. There may be demonstrable instances where that is true but when dealing with aluminum and gold it is the exceptions that get you.

For me it was not so much getting the coil to run on the V3i as getting the detector to run the BigFoot, so I gave it a go with the V3i but sold the V3i and went back to the DFX purely to get proper operation on the high frequency. I wanted to run the BigFoot at 22.5 kHz single frequency but reality is 15 kHz single frequency on the DFX is good enough and no odd side effects. The improper null probably means improper ground balance settings are being achieved. If a person does run a BigFoot of the V3i, running 7.5 kHz single frequency works just fine. You can go multifrequency but it gets weird as the VDI numbers shift according to the dominant frequency.

Some excellent commentary on V rated coils and how it applies to BigFoot

"I get questions concerning the no longer produced Bigfoot coil. The problem isn't a lack of demand, or even a lack of manufacturing capacity. The problem is, because of the way Bigfoot is designed, it can't be simply extended to V3's specs. It would have to be completely redesigned. Even then, it might require a design change on V3I itself to get around certain limiting issues. Begging Jimmy to produce a V3I Bigfoot isn't going to make it happen, because it can't happen. Sorry. (CARL)"

Coil Basics by Carl Moreland

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That was some very educational reading, thanks for posting it. It seems that the Bigfoot coil and the DFX are the optimal pairing. I like the fact that the DFX acts in a predictable manner when using the Bigfoot coil. No large variations with VDI numbers or inaccurate depth readings, etc.

Thanks again,

Joe

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I admit it's somewhat tempting to buy a bigfoot coil (after Steve's excellent post I'd jump all over a V-rated bigfoot at a grand if someone would make it. Take my fools gold! :biggrin: ) but my better judgement says just get a Tesoro unit with the widescan 3x18. That's where I'd put the money these days. Seems to me a smarter move for the money.

If I already owned a DFX I'd own a bigfoot too.

Question:

Like other coils, do bigfoot coil properties change or "age" with the passing of time?

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OMG! The coil just sold for $807.50 :ohmy:

Now there is another one for starting bid $850 and "buy it now" of $1105.00 :ohmy::ohmy:

Seriously, no coil manufacturer is intrigued at all by this? If not for a White's why not for something just really popular? Like a BigFoot (figure 8) or Cleansweep (DD) for the Garrett AT series? Go where the numbers are.

I still think Nokta/Makro is missing the bet here. Talk about generating some buzz with a Cleansweep DD type coil for the Racer series, for instance. Such a coil on the Racer 2 would be an excellent matchup.

NEL, DeTech, Coiltek - hello, anybody home?

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  • 3 months later...

Steve, you get the frowny-face emo for dangling "your" bigfoot coil out there, then snatching it away. :laugh:

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