OPERATION
2-5
Revised January 2001
Part No. 001-9800-501
A turn-off delay allows the radio to remain active
for the programmed delay time after the ignition switch
is turned off. At the same time, advantages of ignition
switch control can be utilized such as preventing
battery discharge that may occur if the transceiver is
accidentally left on for an extended period.
2.3.10 TEMPERATURE AND VOLTAGE
MONITORING
Excessive Transceiver Temperature
If the internal transceiver temperature becomes
excessive, a tone sounds and “HOT” is displayed on
the bottom line. Transmit power is then automatically
cut back to approximately 1/3 of normal to limit heat
generation. When the temperature is not longer exces-
sive, power output automatically returns to normal.
This condition may be caused by transmitting for
extended periods or operating in a very warm
environment.
If the temperature continues rising to the point
where serious transceiver damage could result, “TOO
HOT” is displayed, a tone sounds, and the transmitter
is disabled. The PTT switch must then be released and
the temperature drop to the excessive range or lower to
transmit again.
Low Voltage Conditions
If the voltage applied to the transceiver decreases
to the point where improper operation could result,
“LO VOLT” is displayed on the bottom line, a tone
sounds, and the transmitter is disabled. This condition
is usually caused by a discharged vehicle battery. To
clear this condition, operate the vehicle to charge the
battery or transmit with the vehicle running.
2.3.11 SCANNING
Introduction
Scanning cycles through a list of channels, called
a “scan list”, checking each for messages. When a
message is detected that your transceiver is
programmed to receive, scanning stops and the
message is received. Shortly after the message is
complete, scanning resumes (unless it has been
disabled). If the microphone off-hook condition is
detected, the microphone must also be on-hook for
scanning to occur. An off-hook condition also disables
coded squelch as described in Section 2.4.3
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
regardless 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 scan-
ning is occurring, radio wide scanning is automatically
disabled and vice versa. More information on these
modes follows.
Standard Scanning
Standard scanning monitors only 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 turned on
and off by the Scan option switch as follows. If this
switch is not programmed, standard scanning is not
available.
•
To turn standard scanning on, press the Scan option
switch. Scanning is enabled when the “
S
” icon is
indicated in the upper left corner of the display and
SCAN x (conventional) or SCAN ON
(SMARTNET/SmartZone) is briefly displayed on
the lower line of the display. The “x” is the number
of the conventional scan list (1, 2, or 3) that is
selected. Refer to Section 2.4.11 for more
information.
•
To turn scanning off, press the Scan option switch
again. The “
S
” icon is then no longer indicated and
“SCAN OFF” is briefly displayed.
•
If the zone or channel is changed while scanning is
selected, scanning continues on the same or a
different scan list (see scan list information which
follows).
Radio Wide Scanning
Radio wide scanning monitors the channels in the
preprogrammed radio wide scan list (see information
