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Headhunter depth question

A

Anonymous

Guest
Please pardon me if this has been answered already. Mr. Bill listed the Headhunter near the top of his list for depth and sensitivity? As I understand pulse induction,transmitting power is it's only real limiting factor. In other words, the more power, the deeper it will go. I seem to remember that Eric built a boat-towed pulse unit for Mel Fisher that was powered by eight 12v marine batteries and was extremely deep seeking.
Since the electronics for the Headhunter are so small, including the battery, which is all enclosed in the headphone, where does all of it's transmitting power come from to make it so deep seeking?
 
Hi Pete,
I listed the HeadHunter Pi unit at the top of the list, but the list was dealing with beach, and shallow water detectors. That behemoth that Eric built for Mel Fisher can in no way be figured into the equation of hobby beach/water detecting for jewelry.
It had mega watts of power but I doubt it could locate a gold ring the size of one to fit the Jolly Green Giant. The HeadHunter is minuscule in power compared to that one, yet it can detect jewelry that the monster doesn
 
Mr.Bill... I noticed DetectorPro now has a page for their new PI, but it doesn't mention anything about discrimination between ferrous/non-ferrous. Will this be a feature?
 
The HeadHunter does not discriminate between ferrous/non-ferrous, but it does allow one to be able to tell the difference between both. By using the frequency control one will be able to tell the difference between ferrous/non-ferrous. The easiest to do would be between gold jewelry, and iron. This feature performs the best when dealing with deep targets. Things get a little more chancy at shallower depths. Surface targets do throw things out a bit.
With water hunting we dig all targets. We don
 
Hi Bill and Pete,
The megawatt PI I made for Mel Fisher was designed to detect 70lb silver bars at ranges up to 15ft. Silver bars of that size have a very high electrical conductivity and the TX pulse needs to have a long duration to get any reasonable signal. For comparison, PI's for gold rings use a TX pulse width of 50 - 100uS. Mel's machine had a pulse width of 5000uS , hence the TX is on for a much longer period and we also had to pump the current through 300ft of cable to the sled mounted coil! If I remember correctly, the shortest pulse delay time was 200uS, so it would not pick up a gold coin even if near to the coil. However we had other detectors for that - Aquapulse 1, 2 and 3. AQ3 being an experimental underwater Fe/non-Fe discriminator.
Eric.
 
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