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The digital trombone

Ism

Well-known member
Have you ever put your detector in "All Metal" set the threshold, left the upper rod nut loose, turned your coil so it doesn't catch in the preset holes and then slide the lower rod in and out of the upper?
You will see just how far extended the coil detects the upper rod. Now you may wonder if this affects the performance of the detector.

After discovering just how much influence the upper rod has, I performed a test on my Tesoro Vaquero.
I tested it at max distance and at the closest distance. I shut it off between changes and left it on between changes.

Results were no performance loss in all metal or disc.

So while I believe that the upper rod may present some negative influence on a detector's performance, I couldn't find anything substantial to share with the group.
Has this topic been broached here? I couldn't find any info relating to it.
HH Ran
 
The earlier Tesoros often had a lower rod that was metal with a plastic or composite bottom that was only 4 - 5" long and went on down to the coil. I have several of these and several of the lower rods that are synthetic and haven't noticed any performance difference with any of them. They also had metal bolts holding the coil and I haven't been able to tell any difference between those and the newer plastic ones. It's my understanding that as long as the metal (like the older bolt) never moves in relation to the coil that it's pretty much neutral. If you haven't noticed, even in non-motion all metal the coil usually has to move an extremely small bit to induce a signal.
BB
 
You got it right Bill.
 
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