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Viking Portable 600 Radio Operating Manual
5-23
Conventional Mode Features
locked to TG 2, and the user unlocks while on System A, System B will retain its 
locked status. 
Ο
Talkgroup Lock will be retained through powerdown.  Downloading a profile 
through PCConfigure will erase all Talkgroup Lock settings.  
Talkgroup select feature exit will operate as follows 
- The exit buttons (Portable - F1, Mobile – “Exit”) will cause the feature to exit without 
saving any talkgroup changes.  
- The select buttons (Portable – F2, Active Function Button, Mobile – Select Knob 
Button, Lightning Right Nav) will cause the feature to exit after saving the new 
talkgroup. 
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. 
Encryption 
The radio will use the key that is assigned to the active TG unless the Override 
Talkgroup Security Settings is active.  In that case it will use the security parameters 
that are defined in the Override section on the Zone page. 
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. 
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.
Preliminary Draft 3/9/12