Cold and Hot Rocks (For New Users)

[Anonymous]

this is all far more simple than this lengthy discussion would make it seem. You mention rejection repeatedly, surely you realise that this is an artificial rejection brought about by filters (electronic and/or software).
If you have any questions about "stored charges", or materials changing in some semi-permanent way due to the influence of the detectors transmitted field, all you have to do is dig an old BFO type detector out of the closet. Wave your coil 10,000 times over the in-ground iron object, and it will make the detector squeal like a pig each and every time.
DAS

 

[Anonymous]

You are correct and I found myself more interested in the mechanism of rejection and involved in that. There is no reason to make it complicated and I repent of doing so. It did tweak my interest in magnetism but in the end is really just an academic discussion of little value other than that.
I have told myself many times to not get caught up in the process as it may well be only of interest to a very few. Although, I spent some time looking at magnetism of iron with a pulse of energy today it really is time to let it go.
I used many BFO detectors back in the late sixties and early seventies. Garrett had the best one as I recall but also had a Whites with a TR and BFO in the same box. It was an experimental model and never went into production so they gave it to me to play with. As you know the operatio of a BFO is very different than a pulse induction TD detector, TR or VLF but they were a good prospecting detector where you did not need much depth. Garrett's BFO zero drift oscillator was one of the best of the ones I used.
Have a good one,
Cody

 

[Anonymous]

I discussed this with a technician who developing his own detector. He has repaired two Exps with power supply problem when some resistors inside were damaged due to moisture condensation with subsequent electrolyses, due to permanent current in the circuit, when storing the device with battery inside. His recommendations were always to take out the battery during storage after expected frost-warm temperature drop . But this is other story.
About the "charge" he told that it may be also depends on the program inside, how it measures parameters. Either after first sweep or after n-sweeps. Also it could be measured with figures in "digital all metal" to check the difference after first, second, third... sweeps.
Hope my russian english is OK to make myself understood. <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt="">
Good Luck and HH
dok