User's Manual

5-22 Viking™ VP600 Portable Radio Operating Manual
Conventional Mode Features
- The (Menu) button will cause the feature to exit after saving the new talkgroup.
4 Talkgroup Strapping
Talkgroup strapping will have priority over talkgroup lock. This means that a channel
with a strapped talkgroup will use its programmed talkgroup even if talkgroup lock is
turned on. Locking the talkgroup on a channel with a strapped talkgroup will set the
strapped talkgroup as the lock talkgroup.
5 Encryption
The radio will use the key that is assigned to the active TalkGroup unless the Override
Talkgroup Security Settings is active. In that case it will use the security parameters that
are defined in the security section on the Channels page.
6 Scan
If Talkgroup Lock is enabled, the radio will only use the Lock Talkgroup for the
selected channel. The rest of the channels will use the programmed Talkgroup. This is
necessary so that the radio will not only monitor a single TG for all scan channels.
7 Emergency
If emergency is declared while the talkgroup is locked, the radio will use the
Emergency Talkgroup first if it is defined. If no emergency Talkgroup is defined it will
use the Lock Talkgroup.
5.13.8 P25 Unit Calls
Unit Calls (also called Individual Calls) can be placed to a specific radio on a Project 25
channel if the Unit Call option button or menu parameter is programmed. Only the
individual ID of the target radio is sent (a talkgroup ID is not sent). The radios that can be
called are pre programmed in the Unit Call list.
To receive a Unit Call, the RF channel of the call must be selected or scanned and the
correct NAC and unit ID must be detected. The ID of the calling radio is then transmitted
back. To respond to the call, the radio must be programmed with the Unit ID option button
or menu parameter, and have a Unit Call programmed for the ID of the calling radio.
Place and receive a Unit Call as follows:
1 To transmit a Unit Call, press the Unit Call option button or select the Unit Call menu
parameter. The alias (tag) of the last Unit Call is displayed.
2 If required, press the Up/Down buttons to display the desired alias/ID. The alias and ID
of the calls that have been programmed are alternately displayed.
3 Press and release the PTT switch. The display indicates the Unit Call ID. If no answer,
the system times out after 20 seconds.