Page 4-6
Spectra VX
3
User’s Guide
LockTrac
There are some uncommon situations where AutoTrac does
not work well. In extreme ground that has a lot of variability, or
when a lot of trash targets are present, automatic tracking may
result in excessive noise and tracking errors. High levels of EMI
can also cause problems with automatic tracking. In these situa-
tions locking the ground balance at one value may provide bet-
ter performance.
Keep in mind that when tracking is locked,
VX
3
will only be
properly ground balanced for one type of ground. As the ground
varies, there will be errors in the balance point, so there may be
some compromise in depth or target ID. But LockTrac may
allow hunting an area where AutoTrac does not.
Audio
The audio settings presented in Chapter 2 which were
accessed from the Live Control Bar were limited to Volume and
Threshold. The Audio menu also has three audio modes you can
choose, with additional settings for each:
We will cover the modes first, then proceed through the var-
ious settings, not necessarily in the order of the menus. To help
explain the audio modes, let’s take a graphical look at the
VX
3
audio system, shown on the next page.
The
Rx Gain
setting (in the
Sensitivity
menu) is applied to
