Instruction manual
73Understanding your X-TERRA - Technology
Also when the detector’s transmit frequency is slightly dierent to the search coil’s tuned
frequency, noise and interference will be introduced, reducing sensitivity and detection depth.
VFLEX technology corrects this by adjusting the transmit frequency to exactly match the tuned
frequency of the search coil. This is only possible because the microcontroller in the search coil
communicates information about the search coil’s tuned frequency to the control box. So if the
coil is 3.0584 kHz then the transmit frequency from the control box will also be 3.0584 kHz.
Because the search coil can communicate with the control box there’s not just one, but up to
three dierent frequency search coils available: 3 kHz, 7.5 kHz and 18.75 kHz.
Changing the transmit frequency signicantly changes the operation of the detector.
There are other single frequency metal detectors available that have multiple frequency options,
however they spread the components that determine the search coil’s frequency between the
search coil and the control box. This introduces noise and distortion reducing sensitivity and
detection depth.
VFLEX has all the components that determine the search coil’s tuned frequency located together
in the search coil. This ensures that the pure sine wave is transmitted at maximum power into
the ground without distortion.
Low frequency option for deep, large, high conductive
targets such as silver, copper, large rings and relics.
Mid frequency option for all-round detecting.
High frequency option is very sensitive and optimized
for jewelry, ne chains and sub gram gold nuggets.