Maximum Gain Compensation
This setting applies to both CW and FM operation.
Not all single targets are located in the centre of the beam. Targets located off centre will offer weaker echoes due to the beam properties. The ME70 automatically compensates for this using a mathematical model, and you can manually control the effect of this algorithm
by defining a maximum gain value.
Using the 3 dB setting all echoes from within the nominal beam width of the transducer will be accepted. By reducing the value, you will only accept echoes that appear closer to the centre of the beam. Reducing the value of this parameter will effectively narrow the beam opening angles for single target detections, but will
normally improve the accuracy of the target strength values for the detected single targets.
The correction value returned from the transducer gain model must not exceed the maximum gain compensation setting. (This is the one-way maximum gaincompensation. The two-way maximum compensation will be 12 dB). All single targets outside the angle corresponding to the chosen gain compensation are skipped. Thus you can reduce the sample volume (beam angle) by choosing a lower value for maximum gain compensation.