Operators can listen in on demodulated analog audio signals or, in the case of digital
signals, decode them. Based on a signal's waveform and other technical parameters, it
is often possible to draw conclusions about the type of transceiver, which might provide
hints about the monitored target. When the signal becomes demodulated and
decoded, operators can gain access to the signal content, which is often another
valuable result obtained through interception.
Audio signals are processed digitally and transferred to the system controller. From
there, the operator can listen in on all channels. The operator can repeat a missed
sequence from content of interest, because the system stores the last 60 seconds in a
ring buffer. The audio file can be recorded on the hard disk, where it is managed via
the audio database.
If operators encounter a very uncommon signal that might be of interest but cannot be
demodulated or decoded online, they can save the signal's digital baseband data for
offline analysis later. These recording and offline analysis capabilities help ensure that
no signal is lost.
The system's multichannel capabilities permit realtime processing and decoding of
several signals in parallel. Operators can read a signal's content and decide whether
the transmission is of interest. If it is not of interest, decoding can be stopped to free up
system capacity. Furthermore, that frequency can then be put on the white list so that it
does not have to be examined again.