Furuno CHS-5LMARK-2-55, Operator'S Manual

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2. FINE TUNING THE SONAR PICTURE
2-6
2.5.4 Rejecting interference with TX cycle
When other sonars of the same TX frequency as own sonar are near, an interference
ring caused may be displayed. To erase the interference ring from the screen, reduce
the TX CYCLE setting.
Interference rings
1. Press the MENU key.
2. Use the RANGE control to choose [MENU MODE] at the top of the screen.
3. Use the GAIN control to choose [SONAR] to display the [SONAR] menu.
4. Use the RANGE control to choose [TX CYCLE].
5. Use the GAIN control to set TX cycle. The setting range is 0-10 and the higher the
figure the longer the TX cycle.
6. Press the MENU key to close the menu.
Note: When the sonar is used in shallow waters with the range set between 100 m
and 200 m and the TX cycle at "10", a previously reflected echo may appear at close
range. In this case reduce the TX cycle to "7 or 8" to reject it.
Interference
Tx cycle high Tx cycle lowered