To adjust the tone for the discriminate mode, turn the DISC LEVEL knob clockwise just past the
click. You are now in the discriminate mode. The first thing that you will notice is that the
threshold has gone away. The Tejón works in a silent search discriminate mode. You will only
hear a signal when there is a target beneath the coil. The TONE knob works the same way in
discriminate as it does in the all metal mode. You may want to switch back and forth between the
discriminate and all metal modes. You will notice that once the pitch has been set with the
TONE knob, it remains the same in both modes. If you set the TONE knob back into the VCO
setting, the discriminate will operate on a preset audio 10 TEJÓN OPERATOR INSTRUCTION
MANUAL pitch. Take some time to try your targets with various settings and find the tone
setting that is most comfortable for you.
Adjust SENSITIVITY
The most common use of the detector is to hunt in the disc mode and switch to the all metal to
pinpoint a target. This will give you the advantage of ignoring unwanted targets and not having
to listen to the threshold hum until you are ready to pinpoint and dig a target.
The all metal circuit uses a single channel to detect various metals. The discriminate circuit uses
two different channels, then amplifies and filters them. The detector will then compare the
signals and determine whether or not to beep at the target. While there is a great advantage to
ignoring unwanted targets, it can make the circuitry more susceptible to interference. A number
of outside conditions such as power lines, highly mineralized soil, and wet salt sand can cause
interference.
The SENSITIVITY knob is used to raise or lower the power to the operational amplifiers, which
changes the gain. Gain is a measurement of how much a signal is amplified. The higher the gain
the more depth and sensitivity to small objects a detector has. Unfortunately, any small
interference that is amplified can cause the detector to become erratic. The SENSITIVITY
control is used to find the best gain setting in any location without letting the detector become
unstable.
The SENSITIVITY knob is numbered from 1 to 10 with an orange area called the Max Boost
Zone. For normal hunting, anywhere in the numbered zone will work very well. However, the
Max Boost will allow you to increase the power to the operational amplifiers to the point of
overload. This may cause your detector to become unstable and force you to turn the
SENSITIVITY knob to a lower setting. An overload situation will not hurt your detector, but it
will maximize the gain that is used by your detector. This can, in certain conditions such as low
mineralization in the soil, cause your detector to penetrate deeper into the ground and become
more sensitive to small targets.
Take some time to wave targets in front of the coil with different sensitivity settings. If you are
indoors, you may find that you are unable to turn the SENSITIVITY knob as high as you would
if you were outdoors. Notice that the higher the sensitivity setting, the farther away from the coil
that a target can be and still respond with an audio signal.
Perform Air Test in Disc Mode
