SCAN OPERATING MODES
Simple SCAN
Once SCAN is activated, the radio will perform a Sim-
ple SCAN routine. This routine is performed when there is
no activity on any of the channels that are in the Scan list.
The scanning list at
right, is an example of
the routine performed
when there are more
than four (4) channels
in the Scan list.
np6...np5...np4...np3...P1...P2
...np2...np1...np6...np5...P1...
P2...np4...np3...np2...np1...
P1...P2, etc.
(The abbreviation "np" indicates a non-priority channel,
and P1 and P2 indicate Priority 1 and Priority 2, respec-
tively.)
The scanning list at
right, is an example of
the routine performed
when there are less
than four (4) channels
in the Scan list.
np3...np2...np1...P1...P2...np3
...np2...np1...P1...P2, etc.
The above scanning orders assume that Priority 1 and
Priority 2 channels exist. If they have not been assigned,
their positions in the scanning order are eliminated.
PTT
Pressing the PTT switch causes the ra-
dio to transmit on the selected channel
frequency and to stop the scanning rou-
tine. A programmable hang time (0.3 to
5.0 seconds) will start as soon as the
PTT switch is released. Scanning will
resume at the end of the hang time. The
hang time is a PC programmable option
and can be enabled or disabled.
Channel Change
Any channel change will change the se-
lected channel and show it in the display
window. A channel change will also
stop the scanning routine for a fixed, 2-
second hang time. If no activity is de-
tected on this new selected channel
during this 2-second hang time, scan-
ning will resume.
∧
Pressing this button will revert the radio
(selected channel) to a pre-programmed
HOME channel and stop the scanning
routine automatically.
Priority SCAN
As soon as any activity is detected on a channel, the ra-
dio will change the scanning mode from Simple SCAN to
Priority SCAN. The new receive channel will appear in the
LCD window.
If the receive channel
is a Non-Priority
channel, both Priority
1 and Priority 2
channels will be
sampled (scanned)
every 500 milli-
seconds in the order
indicated at the right.
P1...P1...P2...P1...P1...P2...P1
...P1...P2, etc.
•
If a Priority 1 channel has not been established, the
radio will only break away to sample the Priority 2
channel every 1.0 second.
•
If a Priority 1 channel has been established but not a
Priority 2 channel, the radio will break away to
sample the Priority 1 channel every 500 milliseconds.
•
If neither a Priority 1 or Priority 2 channel has been
established, the radio will lock on this channel until
activity on this channel goes away.
•
When the receive channel is a Priority 2 channel, the
radio only samples Priority 1 channel every 500
milliseconds.
•
When the receive channel is a Priority 1 channel, no
other channels will be scanned.
Once activity on the receive channel has ended, a pro-
grammable hang time (0.3 to 5.0 seconds) is started. Scan-
ning will resume at the end of the hang time if there is no
activity on that channel. The selected channel will appear
now on the display. Note that Priority channels will con-
tinue being scanned during hang time.
To alert the operator of an incoming call on the Priority
1 channel, an option is available to sound a beep upon re-
ceiving this Priority 1 channel.
Priority channels will continue being scanned during
hang time.
NOTE
LBI-38956
19
Содержание PCS 136-174 MHz
Страница 11: ...Figure 1 PCS Operating Controls LBI 38956 11 ...
Страница 27: ...MECHANICAL PARTS BREAKDOWN LBI 38956 27 ...
