E F Johnson Company 2425M80 Benutzerhandbuch

Draft 02 - Sep 1 2015

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If the Talkgroup Select option switch is programmed, the talkgroup assigned to a channel 
can be changed by the user. The operation can also be selected from the menu as Select 
TG, or “TGSEL” from the soft button menu (Lightning Control Head only). The new 
talkgroup continues to be assigned to the channel until it is manually changed again 
(cycling power or selecting another channel does not reselect a default talkgroup). Change 
the talkgroup assigned to a channel as follows:

1 Select the channel to be changed and then press the Talkgroup Select option switch.

2 Rotate the Select switch to display the talkgroup to be assigned to that channel. 

Talkgroups are indicated by a unique identification in the alphanumeric display.

3 To select that talkgroup and return to normal operation, press the Talkgroup Select 

switch again or press the Select switch. A single beep sounds when the Select switch is 
pressed (if that option is enabled). If talkgroup selection has been disabled on the 
channel by programming, the talkgroup does not change, “NO LIST” is displayed, and 
a tone sounds.

Unit calls (also called Individual Calls) can be placed to a specific radio on Project 25 
channels using the Unit Call option switch (if programmed) or by menu selection. Only 
the individual ID of the target radio is sent (a talkgroup ID is not sent). The radios that can 
be called are preprogrammed 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 Call option 
switch, and have a Unit Call programmed with the ID of the calling radio.

To place and receive a Unit Call:

1 To transmit a unit call, press the Unit Call option switch, menu option, or soft button 

option (Lightning Control Head only). The alias (tag) of the last Unit Call is displayed.

Direct entry is allowed using the front buttons of the Digital Keypad Mic.

2 If required, rotate the Select switch to display the desired alias/ID. The alias and ID of 

the unit calls that have been programmed are alternately displayed.

3 Press and then release the PTT switch. Ringing is then heard and “WAIT” displayed to 

indicate that the radio is being rung. To disable this ringing but not the call, briefly 
press the PTT switch again. Ringing occurs for 20 seconds or until the call is answered, 
whichever occurs first.