GENERAL OPERATION
17
channel selector is always disabled regardless of the
Permanent Lockout or Keypad Lock status. Chan-
nels can then be selected only by direct channel
select (see Section 3.3).
•
The volume control is permanently disabled if a
Volume Up/Down option switch is programmed
regardless of the Permanent Lockout or Keypad
Lock status. Refer to Section 3.1.3 for more
information.
•
There is the option to enable the backlight when a
key is pressed in the Keypad Lock mode. There is
also the option when programming conventional
channels to disable DTMF dialing.
3.7 SETTING SQUELCH
This radio does not have a squelch control. The
squelch level is preset during alignment. If the keypad
programming feature is available (see Section 5.18),
the squelch level can be changed by the user on each
conventional analog channel.
3.8 TRANSMIT DISABLE
Transmitting can be disabled on each conven-
tional, SMARTNET, SmartZone, and P25 Trunked
channel so that the channel is monitor-only. When
transmitting is attempted on a receive-only channel,
“Rx Only” is displayed and an error tone sounds.
3.9 RADIO OPERATING MODES
3.9.1 GENERAL
Each selectable channel can be programmed for
the conventional (analog or APCO Project 25 digital),
SMARTNET/SmartZone, or APCO Project 25 digital
trunked operating mode. For example, Zone 1/Channel
1 could be a conventional channel, Zone 1/Channel 2 a
SMARTNET channel, and so on. More information on
these modes follows.
3.9.2 CONVENTIONAL MODE
This is a non-trunked operating mode which
accesses independent radio channels. There is no auto-
matic access to several channels. Selecting a conven-
tional channel selects a transmit and receive frequency
and other channel parameters such as squelch control
coding.
Conventional channels can be either standard
(analog) or Project 25 (digital). With digital operation,
the DSP (Digital Signal Processor) converts the audio
signal to digital data which is sent over the air as
complex tones. Another difference is that analog chan-
nels use Call Guard (CTCSS/DCS) squelch control
and Project 25 channels use a NAC (Network Access
Code) and talk group ID codes.
With Project 25 operation, a NAC is transmitted
and it must match the NAC programmed in the base
equipment and the radio(s) being called for communi-
cation to occur. In addition, to receive standard group
calls, the receiving radio must be programmed to detect
the transmitted talk group ID code.
With conventional operation, a busy channel
condition is detected automatically if the busy channel
lockout (transmit disable on busy) feature is
programmed. Otherwise, it must be detected manually.
An out-of-range condition is not indicated by special
tones or messages as with SMARTNET operation
because there is no initial data exchange with the
repeater that allows this condition to be detected.
Operating features unique to conventional channels
are described in Section 5.
3.9.3 SMARTNET/SMARTZONE MODE
This is a trunked operating mode in which auto-
matic access is provided to several RF channels. ID
codes are used to select what radios are being called
and what calls are received. Monitoring is performed
automatically and special messages and tones indicate
busy and out-of-range conditions.
SMARTNET and SmartZone operation and
programming is very similar. Basically, SMARTNET
operation is limited to a single repeater site and Smart-
Zone operation allows automatic roaming between
sites. Enhanced SMARTNET/SmartZone features
include roaming (SmartZone only), telephone, private,
and emergency calls, Call Alert
™
, and messaging.
Either analog or digital signaling may be used (digital
is optional).
