16 Channel Scan - Multiple Signals
This is the mode to use when you want to detect a signal that is mixed in with other signals as might be observed when using one of the wide-band infrasignal modes.
The radio can process infrasignals from several sources, such as infrasonic microphones, infrasonic hydrophones and extremely large loop antennas, all of which can contain multiple signals. This mode scans the frequency range of 1 Hz to 30 Hz in 16 channels and uses narrow band filters to separate the signals. This mode of operation can be used with or without the alarm function turned on.
In this display, if the alarm function were turned on it would alarm if either one or both signals were to cross the alarm threshold level. See more details in the 16 CHANNEL SCAN – ONE SIGNAL paragraph.
16 Channel Scan - One Signal
In this display, the alarm function is turned on and a relative strong test signal is used.
In this case it was detected and peaked in channel 12. When the signal level approaches the alarm threshold (red dotted line), it turns yellow. When it crosses the alarm threshold the first time the signal level turns orange and pauses for a few seconds to take a second measurement. If the signal level crosses the alarm threshold durning the second measurement, it will turn red and sound the alarm. Making a second measurement greatly reduces the chance that a noise spike will cause a false alarm.