GENERAL FEATURES
24
tion switch is turned off. At the same time, advantages of ignition switch
control can be utilized, such as preventing battery discharge that may
occur if the transceiver is accidentally left on for an extended period (see
“Preventing Battery Discharge” on page 38).
Proceed (Clear-To-Talk) Tone
This is a short tone that sounds when the PTT switch is pressed to
indicate that the radio system has been accessed and speaking can begin.
This tone can be programmed so that it sounds on LTR channels but not
conventional channels. This and other tones can also be disabled by
dealer programming. In addition, either a standard or loud (two-pitch)
tone can be programmed.
On LTR channels, if the radio system is busy when making a call,
the busy tone sounds instead of the proceed tone. If the PTT switch is
held down, the system is accessed and the proceed tone sounds when it is
no longer busy. If an out-of-range condition occurs, the intercept tone
sounds and the PTT switch must be released to make another call attempt.
Refer to page 35 for more information on the busy and intercept tones.
On conventional channels, the Transmit Disable On Busy feature can
be used to automatically perform monitoring (see page 33). If the channel
is then busy, the proceed tone does not sound unless the transmitter is
keyed by quickly releasing and then pressing the PTT switch. Otherwise,
the proceed tone sounds (if enabled) even if the channel is busy.
If encryption is used, a 1-second delay occurs before this tone
sounds and two beeps are heard instead of one (to indicate that an
encrypted call is being transmitted). With conventional operation, a short
delay also occurs if Call Guard squelch is used. These delays ensure that
the person you are calling hears the entire first word of your message.
Receive-Only Channels
Channels can be programmed for monitoring only (transmitting is
disabled). If the PTT switch is pressed with one of these channels
selected, the intercept tone sounds and the transmitter does not key.
