I have a furuno 1650f sounder with a transom mount transducer. It works well at slow speeds but not at speed.It looses picture quility over 20km.It is mounted on a 6.8m alloy cat and the tranducer is within 100mm of the port side motor.I have played with the hieght but does not make much differance.I have been told to remove the tranducer to inside the hull onto a bed of marine silicon and use it as a floor mount, as it is mounted to close to the motor.Do you have any ideas as it is very frustating loosing the picture when i am on the plane.
The leading edge of the ducer should be higher than the aft portion. The leading edge must not be below the bottom of the transom. To determine if it is turbulence or radiated interference, put the boat in neutral and run motor up in RPM, if it fails then, with boat stationary, then proximity to motor is a problem and you should buy and in-hull ducer. glueing the transom ducer may or may not work well.
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