2
When all the echoes are viewed side byside, an
easy to interpret “graph“ of the bottom, fish, and
structureappears.
The sound pulses are transmitted at various
frequencies depending on the application. Very
high frequencies (455 kHz) are used for greatest
definition but the operatingdepth is limited. High
frequencies (200 kHz) are commonly used on
consumer sonar and provide a good balance
between depth performance and resolution. Low
frequencies (83 kHz) are typically used to achieve
greaterdepth capability.
The power output is the amo unt of energy
generatedby the sonar transmitter. It is commonly
measuredusing two methods:
•Root Mean Square (RMS) measures power
outputover the entire transmit cycle.
•Peak to Peak measures power output at the
highestpoints.
The benefits of increased power outputare the
ability to detect smaller t argets at greater
distances, ability to overcome noise,better high
speedperformanc
e,a
ndenhanced depth capability.
HowSonar Works