White’s Electronics Spectra V3 - Manual (Page 22)

22 Complete Owner’s Guide - Spectra
®
• This “quick save” method can be used for one specific setting change
ONLY (the last one made). To Save As Default” multiple option changes
from the Live Controls, after all changes are made, select Program, then
hold ENTER and press MENU, select Save As Default, and press ENTER.
• Bottle Cap Reject – Adjusts how aggressively the Discrimination rejects bottle caps and other unusual
alloyed iron that contains both ferrous (iron) and nonferrous (non-iron) mixes. Old Square nails for example.
• In any Discrimination search mode, Bottle Cap Reject adjusts the degree the audio breaks
up (sputters) regarding iron/steel type target signals. 20 is the most aggressive (offers the
greatest degree of break up on iron/steel. OFF provides the minimum degree of audio break
up (least degree of sputter on iron/steel. 1-20 offers increasing degrees of audio break up.
Caution must be used as in some ground types higher settings causes all target signals to
break up or sputter.
• Hot Rock Reject - Adjusts the degree a signal that appears to be a ground mineral abnormality (Hot Rock
at +95 VDI) is allowed to respond (beep).
• What is +95? A +95 can represent a hot rock, sometimes called a cold rock in
prospecting slang). This rock/iron can be above the ground balance point, referred
to as “Hot Rocks” or below the ground balance point often referred to as Cold Rocks.
“If the mineral response is different than the ground balance point, then that particular
signal response (target) is assigned the VDI # 95.”
Example:
“If the GB point is minus 92 and the hot rock, (target or signal response) is minus 94,
then that signal response is assigned VDI +95.”
These conditions can influence target response beyond normal discrimination ranges, sometimes referred
to as “wrap around”. Hence, when mineralized ground is upwardly influencing the VDI number, it may be beneficial
to accept +95. The “wrap” control found in the frequency section of the expert menu is also helpful in identifying
these difficult targets.
• At a setting of OFF all VDI numbers (including +95) are allowed to respond at their
natural occurring single strength or intensity.
• At a setting of -10 all signals that indicate in the Hot Rock VDI range (+95) are excluded
from responding.
• At settings between -9 and +10, all +95 Hot Rock signals are artificially reduced in their
normal occurring strength or intensity compared to all other VDI numbers. The smaller the
number (towards -9), the greater the artificial reduction in the +95 VDI number signal
strength or intensity.
• If excessive +95 Hot Rock indications distract from identifying actual metals or obscure
metal targets, select a more aggressive Hot Rock Reject level, (closer to -10).