FLIR RAYMARINE A75 WiFi - Page 219

• Only use the sonar channels that you really
need. Although it is possible to run multiple sonar
modules simultaneously in a Raymarine system, it
may not always be necessary to do so. If you are
in a scenario that requires only one sonar module
to be active at a time, disable any other sonar
modules by changing the Sonar application pane
to a single one which only displays the output from
one sonar module. Alternatively, disable the ping
for any unused sonar modules by selecting MENU
> Channel > Ping > OFF in the Sonar application.
• Identify the sonar module and transducer that
is causing the interference. To do this, disable
the ping or remove the power for one of the sonar
modules in your system. If the interference in
the Sonar application disappears immediately,
you now know which device is causing the
interference. If the interference doesn’t disappear,
repeat the exercise again with the other sonar
module(s) in your system, one at a time. Once you
know which device is causing the interference,
proceed with the following methods to reduce the
interference from the relevant device.
• Adjust the Interference Rejection Filter. The
default setting for all Raymarine MFDs is “Auto”.
Changing this setting to “High” might help to
reduce interference (MENU > Setup > Sounder
Setup > Interference Rejection). Note that the
Interference Rejection Filter setting is not available
for all sonar modules.
• Decrease the power output of the interfering
transducer. Adjusting the “Power Mode” in
the Sensitivity Settings in the Sonar application
can help to minimize the presence of crosstalk
interference (MENU > Sensitivity Settings >
Power Mode). Note that the Power Mode setting
is not available for all transducers.
• Ensure that you have a common RF ground
point for all electrical equipment on your
vessel. On vessels without an RF ground system,
ensure all product drain wires (where available)
are connected directly to the negative battery
terminal. Ineffective RF grounding can cause
electrical interference which may in turn result in
sonar crosstalk interference.
• Increase the physical distance between your
sonar modules. Electrical interference may be
occurring between a cable on one sonar module,
and a cable on a different sonar module. Ensure
that your sonar modules are physically located as
far away from each other as possible.
• Increase the physical distance between your
sonar transducers. Electrical and / or acoustic
interference may be occurring between the
different transducers in your system. Ensure that
your transducers are physically located as far
away from each other as possible.
Note: Given the effort and potential difculties
involved in relocating sonar equipment, it should
only be considered as a last resort when you judge
the interference to be a signicant problem which
cannot be resolved using the methods described
above.
Note: Due to physical size and other constraints
that vary from vessel to vessel, it may not
be possible to completely eliminate crosstalk
interference from your system. However, this
will not impede your ability to benet from the
full capabilities of your sonar system. Being able
to easily identify the way in which interference is
displayed in the Sonar application can sometimes
be the best and easiest route to dealing with it.
Sonar (Fishnder) application
219