Simrad SP90

ParametersFrequencyThe Frequency parameters can be called from the Horizontal,Vertical and Second ping menus.Note that this parameter dialogue is optional, it will only beavailable if the triple or multiple frequency option has beeninstalled on the sonar.The Frequency parameter dialogue is used to select the transmitterand receiver frequency. In addition to the standard frequency, anoptional multiple frequency version is available.If multiple frequencies are installed, they are mainly intended forsuppression of interference from other hydroacoustic equipment.However, the sound absorption in salt water decreases with thefrequency, thus giving lower frequencies a longer range.If only the standard frequency is installed, Simrad offers aone-month free test period for the multiple frequencies.850-164511 / B101