13-10.3 EOM Signaling Tone
The SECURENET Option generates an End-of-
Message (EOM) signaling tone at the end of
encrypted transmissions. In Generate mode, this
tests the decoding circuit in the radio being
tested.
In Monitor mode, the SECURENET option
detects the EOM signaling tone from the radio
under test. The EOM signaling tone is a 6 kHz
uncoded sine wave appended to encrypted
transmissions by the transmitting unit. The range
of tone frequencies detected is 6 kHz +/- 300 Hz.
The EOM signaling tone tells the receiving unit
that the transmitted signal is finished and squelch
should be applied. An "EOM indication" is
displayed on the analyzer screen (figure 13-18) as
a message whenever the unit being tested
furnishes proper EOM signaling as it terminates
transmission. The message remains on the
display screen until either the mode is switched
out of SECURENET or until another
SECURENET signal is detected.
Figure 13-18. EOM Received Message
189
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