This can occur for the following reasons:
• Past the End Date: Double check the start and end dates of the recordings are what you
were expecting as well as the time and date on the home screen of the recorder as you
may be past the end time and date of the last recording.
• No GPS position for sun-based recordings: Sun based recordings require location
information to calculate the sun rise and set times. If no GPS position could be found and
there was no backup location set in the schedule file then sun-based schedule entries are
ignored. (Note this will not occur if you used the Scheduler GUI program on the PC. When
you make a new schedule on the recorder directly, you can't set a backup location and you
must get a GPS fix when you deploy it.)
9.9 SILENT RECORDINGS
The most likely cause of this is that the microphone was not properly connected.
Make sure that you see the microphone detected symbol on the top row of the home screen to
know that the microphone is properly attached. Unplug the microphone then plug it back in again
and check that the symbol appears.
Note that after the microphone is pushed on, the locking ring at the base of the connector needs
to be turned to lock it into place, see 5.1 Attaching a microphone.
9.10 CALCULATING GAIN
To convert a gain value given in dB into a multiplication factor of the original signal, you can use
the following equation:
For example, 20dB gain is 10 to the power of (20 divided by 20) giving 10
1
which equals a
multiplication factor of 10.
Below is a table of common gain values in dB and the corresponding value as a multiplication
factor of the original signal.
Gain (dB) Gain (multiplication factor)
10
3.16 ( or
)
20 10
30 31.6
40 100
50 316
60 1000
(Gain in dB)/20
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