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Originally posted by Unregistered
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mistake ? What's mistake ?
What about your pole and e.g. wingnut screw at coil ? Are they very strong and with few flex at every swing ?
If not: your false signals are due to bad choice for pole, wingnut etc etc so it's a MECHANICAL PROBLEM; use strong stuff to fix, avoid putting too much metal near coil better if you use all plastic/naylon fittings etc
If problem isn't related to swing but to behaviour of detector over soil , so "swinging over soil" that must be related to bad GEB tuning or bad soil (very hi-mineralized or trashy place... where there are e.g. lot of foil fragments and the like). It happens that you hear lot of noise in all-metal in places where there was e.g. an iron fence then all rusty and broken into small fragments on soil... thus mixed with soil: this is a worse situation and your detector will react to iron "spots" on soil in all-metal, then also in disc mode... cause sometimes iron-wires are zinc plated... and zinc will contaminate soil for indefinite time (forever
) and will be detected in disc mode ! TGS is very hi sensitive machine so you haven't worry about that... use disc to partially cancel its effect when you notice it.This problem is kinda of CHEMICAL PROBLEM.
If you wanna be sure of cause between the two... try swing coil at 30cm+ from soil: if problem disappears then you are about sure that you have bad GEB or that soil has contamination/trash inside.
To fix GEB you have to tune GEB pot on soil... find a position where problem disappear or is hi-reduced: if it's impossible finding that position you soil is surely trashy so you cannot do anything but play with disc to avoid part of false signals.
TGS is not a trashy-soil-battleship like others kind of detectors: you can use on trashy sites but there are drawbacks ; it likes clean medium mineralized soil. Your large coil will pick up too much signal from false targets: if your sites are trashy build a 5'' coil and you will search with more fun there. Use the large coil on clean soils.
Last but not least: electromechanical fittings could be a problem -> ELECTROMECHANICAL PROBLEM. Fix everything very well, if use metal case connect case to GND, connect blocking ring of connector and its metal body to gnd too of coil, wires inside control box must be fixed too somehow, fix coil cable to pole with tight binds.
Any swing of connector or wire or everything will develop noise in the circuit.
Be unflexible, and you'll gain rock solid performances.
Kind regards,
Max
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