20
Sensitivity Control
The
Sensitivity
control increases or decreases the amplification of the receive signal.
Normally, this determines how deep the detector will “see” a target. However,
increasing the
Sensitivity
not only increases the amplification of target signals, but
also of ground signals and EMI. A common mistake is that higher
Sensitivity
will
always give better depth. In air tests this is generally true, but ground results can
depend on the amount and type of mineralization.
With the coil on the ground, increase the
Sensitivity
until the detector exhibits
chatter, then back off slightly for a reasonably steady threshold tone. Beyond the
preset level of 4 the signal gain increases only moderately, but noise can increase
substantially. Only use higher
Sensitivity
settings in exceedingly low-noise areas.
ATS (AUTO TUNE SPEED) Control
Normally the coil must be in motion to detect targets. If you stop directly over a
target, the detector will “retune” itself and the target response will cease. The
ATS
control sets the retune speed of the receiver.
A lower setting produces a slower retune; it slightly improves target responses
(depth) but target separation will degrade. A higher setting produces a faster retune;
it will slightly reduce target depth but can also reduce ground and EMI noise and
potentially improve overall sensitivity.
A lower setting produces a slower retune speed which:
•
Improves target depth detection (but requires slower sweep speed)
•
Degrades target separation
•
Increases the salt response in active surf conditions
•
Makes iron rejection more difficult
A higher setting produces a faster retune speed which:
•
Reduces the depth at which targets are detected
•
Reduces ground and EMI noise, including salt-surf operation
•
Improves iron rejection
•
Allows for faster coil sweep (cover more ground)
USER CONTROLS
(Continued)
