Instruction Manual
Page 23 of 25
SPECIFIC TONES:
Specific tones are tones that have one function only. Their function is not described
in this section. Only how the tone is generated is described in this section.
Tone
Description
POWER ON/OFF
1400 Hz, 200 msec tone – indicates that power to the unit is
ON and that it is safe to release the power button
SYSTEM BUSY
Tone similar to the standard telephone busy tone – indicates
that the LTR radio system is currently busy. Note: Produced
by turning combined 480 and 620 Hz tones on and off at a 5
Hz rate.
CALL GRANTED
tone composed of two short 700 Hz, 20 msec tones, separated
by a short 900 Hz, 20 msec tone – sounds after the call has
been granted upon pressing PTT to indicate when talking can
begin
CHANNEL
AVAILABLE
Composed of three short 1000 Hz, 20 msec tones, separated
by two short 1200 Hz, 20 msec tones – sounds after the radio
has been waiting in queue for an available channel
Intercept
Siren-like tones consisting of 700 Hz and 800 Hz tones
alternating at approximately at 2 Hz rate – indicates error
conditions like: OUT OF RANGE, TRANSMIT INHIBIT,
RECEIVE ONLY CHANNEL, TRANSMIT WHILE
RECEIVING, and TIME-OUT TIMER.
AUX FUNCTION
ACTIVE
a short (900 Hz, 40 msec) tone that sounds to indicate that the
Aux function key is now activated/deactivated.
TIME OUT TIMER
WARNING
a short high beep 1400 Hz, 20 msec tone to indicate that the
Time-Out timer is about to go off
INCOMING CALL
This is composed of two short 1400 Hz, 40 msec tones,
separated by one short 1000 Hz, 40 msec tones which sounds
a call is received.
VOLUME SET
900 Hz.tone to indicate the volume setting level.
ENTERED
PROGRAMMING
MODE
a 1000 Hz, 40 msec tone, followed by a 1200 Hz, 40 msec
tone, followed by a 800 Hz, 40 msec tone, repeated twice
back to back
