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Whites Tdi sl query

GazinUK

Member
Hi all, just found a little used 2017 model of this machine at a decent price. Watched a few videos and seems straight forward enough, however have a couple of questions.
1. What generates the depth of pulse machines, gain, number of pulses, etc etc?
2. Does using the gb to eliminate nails lose depth?
Am not new to detecting, but never had a pi.
Thanks, Gaz.
 

Jim in Idaho

Well-known member
Depth is determined by the current being delivered to the coil, in a PI. GB always looses some sensitivity, and they're is no discrimination of iron with the TDI series. The '17 model has the 2nd Reg Sniff "increased sensitvity mod done at the factory. Should be a good unit.
Jim
 

GazinUK

Member
Thanks for that, appreciate there's no discrimination control as such, but watching 1 video the user shut out nails by backing off on the gb.
 

Jim in Idaho

Well-known member
Yeah, the GB can change the response for various targets. The GB can change the tone response from hi to low, depending on where it is set.
Jim
 

trojdor

Well-known member
The answer to your question 2 is;
Yes. Using GB to reduce iron will reduce depth, but one of the great strengths of PI is that it's actually very hard for PI to see some forms of trash (like foil wrappers).
So, if you're in an area where foil trash is completely masking signals on VLFs, the pulse machines can pretty much ignore it.

The late TDI guru, Reg Sniff, was a great proponent of this method of hunting.
 

GazinUK

Member
Tha
The answer to your question 2 is;
Yes. Using GB to reduce iron will reduce depth, but one of the great strengths of PI is that it's actually very hard for PI to see some forms of trash (like foil wrappers).
So, if you're in an area where foil trash is completely masking signals on VLFs, the pulse machines can pretty much ignore it.

The late TDI guru, Reg Sniff, was a great proponent of this method of hunting.
Thank you, am slowly gathering information about this machine, it should do what I want it to.
 
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