Motorola 4550 用户手册

To make a call to a group of users, your radio must be 
configured as part of that group.

Procedure: 

Press the Channel Rocker to select the channel with the 
active group alias or ID.

Press the PTT button to make the call. The green LED lights 
up. The display shows the group alias or ID, and the Group 
Call icon.

Wait for the Talk Permit Tone to finish (if enabled) and 
speak clearly into the microphone.
OR

 Wait for the PTT Sidetone to finish (if enabled) and 

speak clearly into the microphone.

Release the PTT button to listen. When the target radio 
responds, the green LED blinks. You see the Group Call 
icon, the group alias or ID, and transmitting radio alias 
or ID on your display.

 If the Channel Free Indication feature is enabled, you 

will hear a short alert tone the moment the target radio 
releases the PTT button, indicating the channel is free for 
you to respond. Press the PTT button to respond.
OR
If there is no voice activity for a predetermined period of 
time, the call ends.

Radio returns to the screen you were on prior to initiating the 
call.

You can also make a Group Call via Contacts (see Making a 
Group Call from Contacts on page 29).

While you can receive and/or respond to a Private Call    
initiated by an authorized individual radio, your radio must 
be programmed for you to initiate a Private Call.

You will hear a negative indicator tone, when you make a 
Private Call via the Menu, Call Log, Contacts list, the One 
Touch Access button, or the Channel Rocker, if this feature is 
not enabled.

Use the Text Message or Call Alert features to contact an 
individual radio. See Text Messaging Features on page 41 or 
Call Alert Operation on page 35 for more information.

NAG_6880309T15.book  Page 17  Tuesday, March 9, 2010  11:47 AM