JRC Alphatron SSRS, Installation And Operation Manual

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2.9.3 Audio Settings
The audio settings of the Alphatron SSRS allows the signal to noise ratio required to be adjusted, prior to a fog horn
being detected. The default value is 2.25 is calibrated to handle a fog horn where the bulk of the energy lies between
700-2100 Hz from 0.5 nautical miles when a horn creates a 115 dB SPL sound level.
The signal to noise ratio configuration ranges from 2 to 6. The higher the values the stricter the Alphatron SSRS will be in
detecting horns. Lower values will detect more horns, but are more susceptible to false detections.
To configure the signal to noise ratio, perform the following actions:
Figure 31: Audio settings - signal to noise ratio.
1. Use the slider, or manually type in a value.
2. Click the SAVE SETTINGS button.
29 | Operation