TRANSCEIVER OPERATION
2-6
November 1999
Part No. 001-7780-500
channel it can be programmed for times from 15
seconds up to 3 minutes, 45 secondsor disabled (not
used). If the transmitter is keyed continuously for
longer than the programmed time, the transmitt er is
disabled and an invalid condition tone sounds. Five
seconds before time-outoccurs, an alert tone sounds to
indicate that time-out is approaching.The timer and
tone are reset by releasing the PTTswitch.
One use of this feature is to prevent a channel
from being kept busy for an extendedperiod by an
accidentally keyed transmitter.It can also prevent
possible transmitterdamage caused by transmitting for
an excessively long period.Conventional channels can
also be programmed with the Penalty and Conversa-
tion timers that are described in Sections 2.4.7 an d
2.4.8.
2.3.10 TONE ENABLE/DISABLE
The supervisory tones (see Section 2. 6) can be
enabled and disabled by the TonesOn-Off option
switch if it is programmed. When tonesare enabled by
this switch, “TONE ON” is momentarily displa yed
and a tone sounds. Conversely,when tones are
disabled, “TONE OFF” is displayed and no tone
sounds. If the Tones On-Offoption switch is not
programmed, tones are fixed in the on or off mode by
programming.
2.3.11 SCANNING
Introduction
Scanning cycles through a list of channels, called
a “scan list”, checking eachfor messages. When a
message is detected that your transceiver is
programmed to receive, scanningstops and the
message is received. Shortlyafter the message is
complete, scanning resumes (unless it has been
disabled).
There are two basic scan modes:Standard and
Radio Wide. The Standardmode is unique to the type
of channel selected (conventionalor SMARTNET/
SmartZone), and the Radio Widemode is the same
regardless of the channel typeselected. Only one of
these scan modes can be enabled at a time. Therefore,
if standard scanning is enabled while radio wi de scan-
ning is occurring, radio wide scanning is au tomatically
disabled and vice versa.More information on these
modes follows.
Standard Scanning
Standard scanning monitorsonly channels that
are the same type as that currently selected. There-
fore, if a conventional channel is selected, only
conventional channels are scanned,and if a
SMARTNET channel is selected, only SMARTNET
channels are scanned. Standard scanning is turnedon
andoffbytheScanoptionswitchasfollows.Ifthis
switch is not programmed, standardscanning is not
available.
•Toturn standard scanning on, press the Scan option
switch. Scanning is enabled whenthe “S”iconis
indicated in the upper left cornerof the display and
SCAN x (conventional) or SCAN ON
(SMARTNET/SmartZone) is briefly displayed . The
“x” is the number of the conventionalscan list (1, 2,
or 3) that is selected. Refer to Section 2.4.11for
more information.
•To turn scanningoff, press the Scan option switch
again. The “S” icon is then no longer indicatedand
“SCAN OFF” is briefly displayed.
•If the zone or channel is changed while scanning is
selected, scanning continues onthe same or a
different scan list(see scan list information which
follows).
Radio Wide Scanning
Radio wide scanning monitors the channelsi nt he
preprogrammed radio wide scan list(see information
whichfollows).Thislistmaycontainupto16chan-
nels of any type (conventional or SMARTNET/Smart-
Zone) assigned to any zone. Radiowide scanning is
turned on and off by theRadio Wide Scan option
switch as follows. If this switch i s not programmed,
radio wide scanning is not available.
•To turnradio wide scanning on, press the Radio
Wide Scan option switch. The icon is then
displayedcontinuously and “RWS ON” is displayed
briefly.