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hot rock help
- Thread starter pax
- Start date
If your machine has an adjustable ground balance often manually raising or lowering the g b a bit can help(which helps best depends on the hot rock). Using the frequency offset may also help. reduceing sensitivity may help, changing the discrimination may also help, it depends what metals are in the hot rocks. If the problem is crushed steelmill slag or clunkers from a coal furnace it's very hard to hunt.
Hot rocks can be a real pain.....try pinpointing it. You may find it is a large target, by raising the coil at intervals. see where the audio quits. That should give you an indication as to how large it is. To work with and find good targets around hot rocks, try this (from the AT Pro Manual).........
On the plus side, a hot rock could also be a meteorite. There are common characteristics of meteorites, but that's a totally different subject.
"Tips for locating targets amongst terra cotta/hot rocks:
Magnetic minerals such as hot rocks and terra cotta can
mask the presence of good targets. In order to detect a good
target, first ground balance the AT Pro to the terra cotta or hot
rocks that are present. Be aware, however, that the combined
Target ID might be very low (e.g. a bronze coin and terra
cotta together may register between 10 and 15 on the Digital
Target ID). Therefore, Iron Discrimination levels must be
reduced in order to ensure detection of good targets covered
by the terra cotta. The Iron Audio feature can also be used
so that all targets above the point of discrimination produce
either a medium or high tone (i.e. "good" targets)"
Magnetic minerals such as hot rocks and terra cotta can
mask the presence of good targets. In order to detect a good
target, first ground balance the AT Pro to the terra cotta or hot
rocks that are present. Be aware, however, that the combined
Target ID might be very low (e.g. a bronze coin and terra
cotta together may register between 10 and 15 on the Digital
Target ID). Therefore, Iron Discrimination levels must be
reduced in order to ensure detection of good targets covered
by the terra cotta. The Iron Audio feature can also be used
so that all targets above the point of discrimination produce
either a medium or high tone (i.e. "good" targets)"
On the plus side, a hot rock could also be a meteorite. There are common characteristics of meteorites, but that's a totally different subject.