Search Coils - Minelab Quattro MP User Manual

3. search coils

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3. Search Coils
The function of the search coil is to transmit electromagnetic
signals into the ground, and receive the response.
The Quattro MP is supplied with a 10.5 inch open web "Double D"
search coil. Double D is the common term used to describe the
two internal coil windings which overlap each other, producing a
blade like search pattern. The advantages of Double D coils are
very good ground cancelling abilities, and very good ground
coverage, as the coil has an even detection range along its entire
length. Because of this, the operator is only required to slightly
overlap each sweep, to ensure all targets at maximum depth are
recovered.
The 10.5" coil is excellent for general searching. There is an
optional 8" coil available that provides greater sensitivity to small
targets, and improved performance in high trash areas.
Both coils are epoxy filled, so they can be submersed in
water, but care must be taken to ensure the control box
remains dry.
To replace the search coil:
1. Undo control box camlock and disconnect the coil cable
from the control box.
2. Separate the two shaft assemblies by releasing the shaft
camlock and sliding the lower shaft out.
3. Loosen the plastic nut and remove the bolt from the yoke
bracket.
4. Gently pull the coil cable from inside the yoke/lower shaft.
5. Carefully feed the new coil cable into the yoke and lower shaft.
Continue to feed the cable into the shaft until the connector is
visible at the top of the shaft.
Note: It may be easier to pull the cable through the lower shaft
using a length of string or cord.
Once this is completed you should be able to see approximately
4 inches (100mm) of cable between the coil yoke and the search
coil. This is the slack necessary to allow adjustment to the angle
of the search coil.
6. Re-attach the yoke and the search coil.
7. Reconnect cable to control box (as directed in Connecting the
shaft assembly, page 7).
Caution: DO NOT attempt to remove the coil cable from
the search coil. Any attempt to disconnect will void
your coil warranty.
Note: For ease of changing colis, it is advised that
each coil be fitted to its own lower shaft.
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