Every ping has a length, a power and a rhythm. Match them to the water and the fish.
At a glance
- TX pulse length: 1 to 9, higher is longer
- TX power: 0 to 9, higher is stronger
- TX interval: Manual, Random 1-4, External Sync
- Bottom fish: shorten the pulse
About 8 minutes. Part of Run the CSH-10.
Pulse length
A longer pulse carries more energy and reaches farther; a shorter pulse separates targets that are close together. Furuno's manual says to shorten the pulse for bottom fish and use the longest pulse for surface and midwater fish. The settings guide lists pulse length as 1 to 9, while the manual's text mentions a longest value of 10. Check the range your own menu shows.
Transmit power
TX power runs from 0 to 9; a higher value transmits more strongly. The manual says that in shallow water you should reduce transmit power rather than gain, and use full power for long range.
TX interval
Manual sets a fixed ping rate based on the sonar range (a higher value pings faster). Random 1 to 4 varies the interval so interference from another sonar on the same frequency is reduced; a larger number gives more variation. External Sync times your pings to a key pulse from another source, which needs a signal input.
Watch it done
Furuno USA publishes these CSH-10 videos. They play from YouTube when you press play.
Operator Orientation Part 7: pulse length, transmission power, TX interval and target lock
Check yourself
Three questions
Sources
- CSH10 Explanation of User Settings: TX interval, TX pulse length and TX power
- CSH10 Operator's Manual: Sections 2.2.2 and 2.3
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.