User's Manual

GENERAL OPERATION
13
Revised August 2002
Part No. 001-5300-007CD-NR
3.15 MICROPHONE OFF-HOOK DETECT
The microphone hanger can be connected to
chassis ground and the radio programmed to detect an
off-hook condition (Hangup Box Monitor selected).
The following operation then occurs when the micro-
phone is taken off-hook:
Conventional Channel Selected
- Scanning tempo-
rarily halts (if applicable) and the Monitor Mode
described in Section 4.3 is enabled. However, the
receiver unsquelches only if a carrier is detected.
SMARTNET/SmartZone/P25 Trunked Channel
Selected - Scanning temporarily halts if applicable.
If the off-hook condition is not detected (Hangup
Box Monitor not selected), the microphone hook state
has no affect on radio operation.
3.16 SCANNING
3.16.1 INTRODUCTION
Scanning monitors the channels in the scan list
for messages the transceiver is programmed to receive.
When a message is detected, 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
(Hangup Box Monitor selected by programming),
scanning stops and selective squelch (such as Call
Guard CTCSS or NAC/group ID detect) is disabled on
conventional channels. If the off-hook condition is not
detected, taking the microphone off-hook has no affect
on transceiver operation.
There are two scan modes available: Standard and
Radio Wide. The standard type is unique to the type of
channel selected, and the Radio Wide type is the same
for all channel types. Only one type of scanning can be
enabled at a time. Therefore, if standard scanning is
enabled when the Radio Wide Scan switch is pressed,
standard scanning is automatically disabled and vice
versa. Refer to the following for more information.
3.16.2 STANDARD SCANNING
Standard scanning monitors only channels that
are the same type as that currently selected. For
example, if a conventional channel is selected, only
conventional channels are scanned and likewise for
SMARTNET/SmartZone and Project 25 trunked
channels. For more information on scanning functions
unique to these operating modes, refer to Sections 4.11
and 5.11. Standard scanning operates as follows.
• To turn standard scanning on, press the SCAN
option switch. Scanning is enabled when a rotating
is indicated in the right status display as follows
and “SCAN ON” is briefly displayed.
• To turn scanning off, press the SCAN option switch
again. On conventional channels, this may also
select another list, so several presses may be
required (see Section 4.11). Scanning is disabled
when “SCAN OFF” is briefly displayed and is no
longer indicated in the status display.
• If the zone or channel is changed while scanning is
selected, scanning continues on the same or a
different scan list (see Section 3.17.1).
NOTE: Each SMARTNET/SmartZone and P25 trunked
channel can be programmed so that scanning is auto-
matically enabled when the channel is selected.
3.16.3 RADIO WIDE SCANNING
NOTE: Use radio wide scanning only if two types of
channels need to be scanned at the same time such as
conventional and SMARTNET/SmartZone. Otherwise,
use the more efficient standard scanning because there
is less chance of missed calls.
Radio wide scanning monitors the channels in the
preprogrammed radio wide scan list. This list may
contain up to 16 channels of any type assigned to any
Scan Enable Indicator