GENERAL OPERATION
23
One use of this feature is to prevent a channel from being kept busy
for an extended period by an accidentally keyed transmitter. It can also
prevent possible transmitter damage caused by transmitting for an exces-
sively long period. Conventional channels can also be programmed with
the Penalty and Conversation timers that are described starting on
page 33.
Tone Enable/Disable
The supervisory tones (see page 62) can be enabled and disabled by
the Tones On-Off option switch if it is programmed. When tones are
enabled by this switch, “TONE ON” is momentarily displayed and a tone
sounds. Conversely, when tones are disabled, “TONE OFF” is displayed
and no tone sounds. If the Tones On-Off option switch is not
programmed, tones are fixed in the on or off mode by system operator
programming.
Scanning
Introduction
Scanning cycles through a list of channels called a “scan list”,
checking each for messages. When a message is detected that your trans-
ceiver is programmed to receive, scanning stops and the message is
received. Shortly after the message is complete, scanning resumes (unless
it has been disabled).
There are two basic scan modes: Standard and Radio Wide. The
Standard mode is unique to the type of channel selected (conventional or
SMARTNET/SmartZone), and the Radio Wide mode is the same regard-
less of the channel type selected. Only one of these scan modes can be
enabled at a time. Therefore, if standard scanning is enabled while radio
wide scanning is occurring, radio wide scanning is automatically disabled
and vice versa. More information on these modes follows.
Summary of Contents for 51 Series
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