OPERATION
2-10
Revised January 2001
Part No. 001-9800-501
selection is not permitted on the current channel, the
fixed power level is flashed and no power change
occurs. Turning power off or changing channels does
not change the power setting selected for a channel.
2.4.11 CONVENTIONAL MODE SCANNING
General
The following information describes scanning
features unique to conventional operation. Scan opera-
tion common to all modes is described in Section
2.3.11, and scan operation unique to SMARTNET/
SmartZone operation is described in Section 2.5.12.
Selecting a Scan List
With conventional standard scanning, one of up
to three scan lists can be selected. Scanning is turned
on and off and the scan list selected by repeatedly
pressing the Scan switch as follows:
1. Press the Scan option switch once to enable scan-
ning and Scan List 1. The “
S
” icon is then indicated
in the upper left corner of the display and “SCAN 1”
is momentarily displayed on the bottom line.
2. Press the Scan option switch again to select Scan
List 2 (if available), and “SCAN 2” is momentarily
displayed. Press it again to select Scan List 3 (if
available).
3. Pressing the Scan option switch again disables scan-
ning (the “
S
” icon is no longer displayed). If the
Scan option switch is pressed again, the cycle
repeats.
Transmitting in Scan Mode
Each conventional scan list can be programmed
for one of the following modes. These modes deter-
mine if priority sampling occurs and also the channel
on which transmissions occur while scanning. Refer to
the next section for more information.
No Priority -
No priority channel sampling occurs
when the list is selected. The radio transmits on the
selected channel.
Priority/Tx Priority -
Priority sampling occurs and
the priority channel is the one programmed in the
selected scan list. The radio transmits on the priority
channel.
Priority/Tx Selected -
Priority sampling occurs and
the priority channel is the one programmed in the
selected scan list. The radio transmits on the selected
channel.
Priority on Selected -
The priority channel is always
the selected channel. The radio transmits on the
selected channel.
Talkback -
No priority sampling occurs. The radio
transmits on the channel of a call while scanning is
halted. Then once scanning resumes, it transmits on
the selected channel.
2.4.12 PRIORITY CHANNEL SAMPLING
General
The priority channel sampling feature ensures
that when standard scanning, messages on the priority
channel are not missed while listening to a message on
some other channel. The transceiver can be
programmed so that the priority channel is a fixed
channel associated with the current scan list, the
currently selected channel, or not used. When the
selected channel is a priority channel,
“
P
”
is indicated
in the upper right part of the display.
Priority channel sampling occurs only with Stan-
dard conventional scanning. It does not occur with
Radio Wide scanning, when listening to any type of
SMARTNET/SmartZone call, or when transmitting. A
series of “ticks” may be heard when the priority
channel is sampled while listening to a message on
some other channel.
The priority sampling times are programmed by
the following parameters:
Lookback Time A -
This time determines how often
the priority channel is checked for activity. Times of
0.25-4.00 seconds in 0.25-second steps can be
programmed.
Lookback Time B -
This time determines how often
the priority channel is checked once an incorrect Call
Guard (CTCSS/DCS) code is detected. Since it takes
much longer to detect an incorrect Call Guard signal
