Reducing Sonar Transducer Interference - MotorGuide Tour Pro 82 Operation Maintenance Installation Warranty Manual

Symptom
Mount bracket
squeaks
Excessive steering
Unintended
heading changes
in Heading Lock
Unintended
kick‑out of Anchor
Mode

Reducing Sonar Transducer Interference

Sonar transducers can be affected by interference, such as radio frequency
interference (RFI) and electromagnetic interference (EMI). This interference
can cause undesired operation of the sonar display. Refer to the following list to
reduce sonar interference sources.
1. Lower the sonar sensitivity, also known as gain. Refer to the documents
included with your sonar display.
a. Change the sensitivity to an automatic setting.
b. If the automatic setting does not reduce sonar interference, manually
change the sensitivity to 55–65% of the maximum setting.
2. Verify that the transducer cable is not routed near any power cables.
3. Ensure that the positive (+) and negative (–) power cables are installed
next to each other. This helps cancel any EMI.
4. Inspect the transducer cable for damage, nicks, or cuts. Replace the
transducer cable if it is damaged.
5. Connect the sonar display to a separate accessory battery with only the
sonar display connected. This will verify if the interference is coming from
the power cables or the transducer cable.
a. If the interference stops when the sonar display is connected to a
separate accessory battery, inspect the boat wiring. Most likely, there
is a problem with the ground (–) connection. All devices should have a
common ground.
b. If the interference continues, it is likely coming from the transducer or
transducer cable.
6. Install a radio frequency (RF) choke onto the sonar display power cable.
TROUBLESHOOTING
Possible Cause
Lock pins need lubrication
The cable tension screw
is too tight.
The cable tension screw
is too tight.
The cable tension screw
is too tight.
68
Resolution
Lubricate the lock pins on the
mount bracket with 2‑4‑C
with PTFE.
Loosen the cable tension
screw and tighten only until
there is no play in the foot
pedal pad.
Loosen the cable tension
screw and tighten only until
there is no play in the foot
pedal pad.
Loosen the cable tension
screw and tighten only until
there is no play in the foot
pedal pad.
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