E F Johnson Company 2425770 사용자 설명서

5-18 

Viking Portable 600 Radio Operating Manual

The third is pressing and holding a button programmed for Two Tone. This will enter the 
Two Tone List. Again, from this point, scrolling to the desired tone in the list and pressing 
PTT or the select button will activate and store the Two Tone.

Two Tone can be activated by using Emergency Analog Signaling, ANI Analog Signaling, 
or RTT Analog Signaling. Direct activation (through button press or PTT/Select Button 
press in the Two Tone List) must be programmed. If not programmed and the user tries to 
send a Two Tone Page directly, the subscriber will bad beep.

The following features are unique to conventional P25 channels.

Each radio that operates on Project 25 (digital) channels is programmed with an eight-digit 
unit ID. This ID is unique for each radio and can be any number from 1-16,777,215. When 
power is turned on with a Project 25 channel selected, this ID is briefly displayed.

Each Project 25 channel is programmed with a talkgroup ID that determines which group 
of radios will receive the call. A call is received on a channel if a selected or scanned 
channel is programmed with that ID and the correct NAC is detected (see following). 
Talkgroup IDs can be any number from 0-65,535. Talkgroup ID detect can be disabled by 
the Normal/Selective squelch function described in Section 5.4.1 or the monitor mode 
described in Section 5.2

Project 25 conventional channels also use a NAC (Network Access Code) to control which 
calls are received on a channel. The NAC can be 0-4095, and each transmit and receive 
channel can be programmed for a different code. Other operation, such as monitoring 
before transmitting, is similar to that of analog channels. NAC (and talkgroup ID) detect 
can be disabled by the monitor mode described in Section 5.2.