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Date Posted: 14:54:26 03/29/02 Fri
Author: Ralph
Subject: Re: GMT - SAT ?
In reply to: Steve Herschbach 's message, "Re: GMT - SAT ?" on 13:24:31 03/29/02 Fri

Hi Steve,

You're right, except that the SAT should be smoothing out the ground signal, and not the "audio" per se. When there is no target signal, in theory and under ideal circuit design, there should be no "noise" at either end of the SAT scale or anywhere in between other than a smoothly generated threshold tone. If there is noise introduced into the front end audio circuits by the SAT circuit, that is something White's really needs to address.

As far as practical applications are concerned, if the ground you are detecting in is "consistent" as to it's mineralization (or lack thereof), there is really no need for SAT except to keep it "level" at the lowest settings. Variable SAT was designed primarily for areas where there is alot of inconsistency in the ground mineralization. There are alot of areas where higher SAT levels are not needed at all. In theory, using your detector for "high grading" should be one of them, since there is no ground signal being introduced.

On the other hand, if like Jim Mc. suggests, there is a "quirk" in the circuit design that creates higher sensitivity at higher SAT while high grading, heck..... use it if there is some advantage. (grin)

But like certain auto-tracking machines, SAT on an otherwise manual machine can cause problems in missing small and deeper weak signal targets if the sweep speed and SAT speeds are not "in sync" to get the best performance for any particular ground conditions. Like you mentioned also, the more SAT you use, the faster the threshold is being "re-tuned", and the less effective your machine becomes at depth, at least where the older V-SAT type units are concerned. More gain can help overcome "part" of that problem, but is not entirely effective in sustaining the same depth as lower SAT speeds provide.

Best rule of thumb I've used is "As little SAT as possible and as much GAIN as possible" (with other settings) to let you best differentiate the true metallics from ground signal. Some places are easy...... others you just have to do the best you can.

Ralph

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