Humminbird CH Thirty II Operation Manual page 4

of a chart recorder is required. If high speed operation is desired, the rear of the transducer
should be lowered five degrees so that a smooth flow of water is experienced from the hull and
across the face of the transducer.
Note: Use the above method of transducer installation on all aluminum hulls. We do not
recommend an inside the hull mounting for any transducer being used with a chart recorder.
Loss of signal will be experienced any time a transducer for a chart recorder is mounted inside
the hull. N you find it necessary to use such an installation, we recommend the following
procedures be followed.
PROCEDURE FOR MOUNTING TRANSDUCER INSIDE HULL OF FIBERGLASS BOAT
Warning: In order to achieve proper results with this type installation, it is important that the
transducer be mounted by someone familiar with the use of Fiberglass resin. For this reason,
Techsonic Industries, Inc. will not be responsible for any damage due to the mounting of your
transducer in this manner.
1. Select as flat an area as possible near the aft end and center of boat where the hull is thin and
not double. If the bottom has a runner down the center of boat select an area to one side of the
runner, but as close to the runner as possible. 2. Clean the inside of the boat with lacquer thinner
in the area transducer is to be mounted. Outside of boat in this area should also be cleaned.
3. Put approximately one inch of water in the bottom of the boat.
4. Put transducer in the water. The bottom of the transducer should be in a flat area and should
be in good contact with the bottom of the boat.
5. Operate the depth sounder with the boat stopped and operating at high speed. The transducer
may have to be moved in order to find an area where satisfactory operation is observed.