Motorola minitor v - Manual (Page 12)

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If the alert monitor detects a transmission on F2 it stops
on F2 then listens for transmissions on F1. Scan back
time is programmable and can be set to 0.5, 1, or 2-
second increments. If a transmission is detected on F1,
the alert monitor switches to F1 cutting off any
transmission on F2. When switching from F2 to F1, the
alert monitor listens for any tones and alerts if the proper
tones are detected. It should be noted that the detection
of tones is very dependent on the duration of the tone
sent over the air. To ensure reliable alerting, it is
recommended that this feature only be used when the first
tone duration transmitted is one second or more.
Non-priority Scan
In the non-priority scan mode, the alert monitor alternately
listens on F1 and F2 for any transmission. A transmission
on either channel causes the alert monitor to stop on that
channel until the signal disappears. In non-priority scan,
the alert monitor decodes tones on either F1 or F2
provided the alert monitor has listened to the appropriate
channel at the correct time. However, it should be noted
that if the alert monitor is listening to traffic on F2 and an
alert is transmitted on F1, the alert monitor will not hear
that signal until the transmission on F2 is finished.
Therefore, an emergency alert could be missed if the alert
monitor is listening to traffic on one channel with tones
being sent out on the other channel.
Silent Scan
In the silent scan mode, the alert monitor alternately
listens on F1 and F2 for alert tones. Detection of alert
tones on each channel causes the alert monitor to stop on
that channel until the signal disappears. In the silent scan