APX 6500 O5 CH 
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 Alert Tones 
IDENTIFYING STATUS INDICATORS 
An alert tone is a sound or group of sounds. Your radio uses alert tones to inform you of your radio’s conditions. 
The following table lists these tones and when they occur. 
You Hear  Tone Name  Heard 
Short, 
Low-Pitched 
Tone 
 
 
Play 
Radio Self Test Fail  When radio fails its power-up self test. 
Reject  When unauthorized request is made. 
Time-Out Timer Warning  Four seconds before time out. 
No ACK Received  When radio fails to receive an acknowledgment. 
Individual Call Warning Tone  When radio is in an individual call for greater than 6 seconds without any activity. 
Talk Prohibit/PTT Inhibit  (When PTT button is pressed) transmissions are not allowed. 
Long, 
Low-Pitched 
Tone 
 
 
Play 
Time-Out Timer 
Timed Out 
After time out. 
Out of Range  (When PTT button is pressed) the radio is out of range of the system. 
Invalid Mode  When radio is on an unpreprogrammed channel. 
A Group of 
Low-Pitched 
Tones 
 
 
Play 
Busy  When system is busy.