User's Manual

Viking Portable 600 Radio Operating Manual 3-15
General Operation
With Project 25 operation, a NAC is transmitted which must match the NAC programmed
in the repeater or base station equipment and the radio(s) being called for communication
to occur. In addition, to receive standard group calls, the receiving radio must be
programmed to detect the transmitted talkgroup 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 trunking 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.
3.11.2 SmartNet / SmartZone Mode
This is a trunked operating mode in which automatic 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 SmartZone 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).
When a SmartNet or SmartZone channel is selected or the radio is powered up on one of
those channels, the alias (name) of the selected channel is displayed as the radio searches
for a control channel. Once a control channel is found, the radio attempts to register on the
trunked system. If a control channel could not be found (because of an out of range
condition or the system ID is not correct, for example), “No Sys” (early units) or “Out Of
Rnge” (later units) is displayed and the radio continues to search for a control channel.
The control channel transmits and receives system information to and from all radios
registered on the system. Therefore, once a control channel is found, it is continuously
monitored for incoming call information and is used to make call requests. The radio
automatically changes to a traffic channel to place and receive calls and then returns to the
control channel when the call is complete. Operating features unique to SmartNet/
SmartZone channels are described in Section 6.
3.11.3 P25 Trunked Mode
The P25 Trunking operating features are very similar to the SmartZone type. Some
differences between the P25 Trunking and SmartZone modes are as follows:
Preliminary Draft 3/9/12