User's Manual

CONVENTIONAL FEATURES
23
Revised August 2002
Part No. 001-5300-007CD-NR
LIST x”, where “x” is the scan list number. Scanning
is disabled when “SCAN OFF” is displayed and the
scanning indicator turns off.
4.11.3 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.
4.11.4 PRIORITY CHANNEL SAMPLING
NOTE: The following describes priority sampling
when scanning conventional channels. Priority
sampling when scanning SMARTNET/SmartZone/P25
Trunked channels is described in Section 5.11.2.
General
The priority channel sampling feature ensures
that when listening to messages on a non-priority
channel when standard scanning, messages on the
priority channel are not missed. The transceiver can be
programmed as just described so that the priority
channel is a fixed channel programmed in the current
scan list, the currently selected channel, or not used.
When scanning and the selected channel is a
priority channel, (selected and preprogrammed??)“
P”
is indicated in the left status display next to the zone
number as follows:
The conventional priority channel is sampled
only when scanning conventional channels. It does not
occur with radio-wide scanning, when listening to a
SMARTNET/SmartZone/P25 Trunked 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 conventional 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) or NAC code is detected. Since
it takes much longer to detect an incorrect Call Guard
signal than a carrier, this time should be relatively long
to prevent the interruptions from making a message
difficult to understand. Times of 0.5-8.0 seconds can
be programmed in 0.5-second steps.
Changing The Priority Channel
NOTE: The priority channel can also be changed
when editing a scan list as described on Section
3.17.5.
If a specific priority channel is associated with
the current scan list, it can be changed if the
PRI SEL
option switch is programmed. Proceed as follows:
Priority Indicator