AKA SOREX PRO Operating Manual page 13

identification channel is (ST), the combination of the threshold tone and ST gives total
sound information on the nature, size and depth of the target, but they are notable for
high sound overflow that may cause discomfort in trashy areas.
PST (polyphony short tone). For example, signal vectors of nails are located in
left corner of the screen. They have negative VDI. Signal vectors of coin-shaped
nonferrous targets are distributed in the right corner and their VDI is positive. This fact
defines the elegance of the sound indication of such targets.
Iron - low tone of SI, nonferrous targets - high tone. However, the practical experience
proves that there is a range of targets (iron plugs, caps, tin pieces) which have signal
vectors (hodographs) either in the left or in the right corner of the display, i.e. signal
phases may get any values during scanning from 0 to 180
The idea is to express this fact in the sound indication and make the polyphony short
tone - the number of tones with various frequencies which would define this class of
objects.
This is the essence of the PST. It is obvious that such mode is more informative but it
requires more trenchant hearing analysis related to practical skills.
MST sound indication type (modulated short tone). This option allows
increasing sound indication capabilities, making short tones more informative in weak
signal zones.
Tone modulation is made by the width of tone burst depending on the object
signal length and size of the object itself.
The option contribute greatly to the distinctions between false responses of
signal indication in the identification channel and signals from the objects.
LT (low tone) border
golden jewelry, as well as nonferrous targets "wiped out" by the ground mineralization or
slightly covered by the iron, quite often may give the "iron" signal in the minus sector of
VDI. But usually they give signal between medium - large iron and foil, and that allows to
identify them with no iron catch. Medium-large wrought iron (wrought nails) is located
approximately at -45 - 40 sectors of the VDI scale. The foil would be in sectors close to 0,
respectively, i.e. sectors 0 to -35 are "suspicious" and subject to exploration in terms of
beach jewel search, search for small medieval crosses or coins on the trash. Having
moved the LT border to the required sector you would not miss those targets on the iron
signal working in the «all metals» mode. It would give the nonferrous tone despite the
minus signal VDI. Pay special attention to the "coin" arrow or narrow hodograph loop of
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Selective Metal Detector SOREX PRO. Operating manual.
This option allows to change type of sound indication
of the ST channel (short tone) between RT, PST and MST.
ST is the type of sound indication for the «all metals»
operation mode. Threshold detection tone works within the
total length of the signal from the object, no matter what the
This option allows to move the sound border of
nonferrous low tone (LT) to the iron sector by the required
value.
It's well-known that small objects, especially pieces of
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