Enable Headphone:
Enables the headphone output on
the PCB. Used for test and calibration
purposes. This connection is not ac
cessible from outside of the housing.
This setting will cause extra current
draw (although minimal).
Enable sample synchronization:
Synchronize multiple Ranos dB' by
enabling this function. The "Transmit
interval" and "Number of samples"
needs to be equal for the Ranos dB'
that need to be synchronized.
The Ranos dB collects the selected
amount of "Number of samples" in
between two "Transmit interval". The
samples are collected evenly spaced
in time. After all samples have been
collected, the samples will be trans
mitted right before starting a new
sampling cycle.
Once a GPS time fix (Unix Epoch) has
been obtained and the last sampling
cycle has been transmitted, the
Ranos dB will calculate the next
coming start moment of the new
sampling cycle relative to if the Unix
Epoch time was the start time of
the sampling cycles. The Ranos dB
will wait until this moment and the
sampling cycle is then restarted. This
ensures that the sample moment for
Ranos dB’ with the same "Transmit
interval" and "Number of samples"
will be synchronous.
After the first synchronization
moment, the internal RTC time will
be resynchronized from the GPS
time every 12 hours. The actual
resynchronization will take place right
after the first LoRa transmission after
12 hours have passed.
Transmit interval:
This setting sets the interval
in seconds between each LoRa
transmission. Limited by local
regulations.
Number of samples:
Sets the number of samples
contained in each transmission.
The sample interval, calculated from
transmit interval divided by number
of samples in the payload also sets
the LAeq and LCeq averaging time.
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