When another boat's sonar is on the same frequency you will see random streaks and spokes. The CSH-10 gives you several ways to deal with it.
At a glance
- Frequency shift: 81.5 to 85.5 kHz, centered at 83.5
- Interference rejector 1: Off, Weak, Strong
- Interference rejector 2: 0 to 6
- Random TX interval also helps
About 7 minutes. Part of Tune the picture.
Shift the frequency
The operating frequency can be moved from 81.5 to 85.5 kHz, with 83.5 kHz as the center and default. Furuno says the echogram does not change dramatically because internal gain offsets are applied. Change it to get away from a nearby sonar or fish finder.
Rejector 1
Removes unwanted reflections that appear randomly. Weak compares three pings and shows the middle echo. Strong compares two pings and shows only where they overlap, so if they do not overlap nothing is shown.
Rejector 2
Reduces interference from other sonars or fish finders on or near your boat, 0 to 6. Raise it for stronger rejection. A value that is too high can remove small wanted echoes.
Random TX interval
The TX interval lesson covers the Random 1 to 4 options, which vary the ping timing to reduce interference from the same transmit frequency.
Check yourself
Three questions
Sources
- CSH10 Explanation of User Settings: Frequency shift, interference rejector 1 and 2, TX interval
This lesson summarizes Furuno's public documents in our own words. Limits and settings differ by model and software version, so your own manual and your installer have the last word. OmniCSH is an independent project, not a Furuno program.