White’s Electronics TDI SL 7.5 and 12 - Manual (Page 16)

Page 16
TDI SL
Owner’s Manual
Setting the Target Conductivity to either Low or High will cut
out half of the response, as shown in the next diagrams. The
noise, which tends to be equally distributed between the high
and low tones, is cut in half. However, you also lose one of the
conductivities. If you know you primarily want to hunt small to
medium nuggets or fine jewelry, then you will not lose much
running in the
Low
mode. If you primarily want to hunt coins or
relics, then you will not lose much running in the
High
mode.
Be mindful that “
All
” is required for ground balancing, because
that is the only mode that gives you both tones.
Threshold also has an effect on how much noise gets
through to the audio. A moderate threshold lets some of the
noise through (anything in the gray region is suppressed):
In this case you will hear a moderate amount of chatter, depend-
ing on the
Gain
setting. Weak target signals may come through
but may be indistinguishable from noise.
Target Conductivity = HIGH
Target Conductivity = LOW