Service manual

OPERATION
3-14
April 2001
Part No. 001-9800-203
A turn-off delay allows features such as the horn
alert and call indicator to remain active for the
programmed delay time after the ignition 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.
3.5.13 PROCEED (CLEAR-TO-TALK) TONE
This is a short tone that sounds shortly after the
PTT switch is pressed to indicate that the system has
been accessed and speaking can begin. It is always
available on LTR systems and can be enabled and
disabled on all conventional systems by program-
ming. This and other tones can also be enabled or
disabled by the Tones menu parameter (high tier only)
or programming as described in Section 3.5.17. There
is also a programmable option to select a standard or
loud (two-pitch) tone.
If the radio system is busy when making an LTR
call, the busy tone sounds instead of the proceed tone
and “BUSY” is indicated on the bottom line of the
display (high tier only, see Section 3.10). If the PTT
switch is held down, the system is accessed and the
proceed tone sounds when it is available. If an out-of-
range condition occurs, the intercept tone sounds and
“OUT-RNGE” is indicated in the display (high tier
only). The PTT switch must then be released and
pressed again to make another call attempt.
On conventional systems, no data handshake with
a repeater occurs, so a busy or out-of-range condition
cannot be detected from data. The Transmit Disable
On Busy feature can be used to automatically perform
monitoring (see Section 3.9.2). If the channel is then
busy, the proceed tone does not sound unless the trans-
mitter is keyed by quickly releasing and then pressing
the PTT switch. Otherwise, the proceed tone sounds (if
enabled) even if the channel is busy.
With all operating modes, if encryption is
programmed, a 0.9-second delay occurs and two beeps
sound instead of one. With conventional operation, if
Call Guard squelch or an external decoder is
programmed on the group, there is a 0.5-second delay
before the proceed tone sounds. These delays give the
receiving mobile time to detect the encryption or Call
Guard signal which prevents the partial loss of the first
word of the transmitted message.
3.5.14 PROGRAMMABLE POWER OUTPUT
With low tier models, one of two power output
levels can be PC programmed for each LTR and
conventional system. With high tier models, one of
five levels can be programmed. The actual power
output at each of these levels is set during transceiver
alignment described in Section 7.3.4. For example, the
high power level could be set for maximum rated
power, low 1 for 20 watts, low 2 for 15 watts, and so
on. Power output is not user selectable, and the
currently selected level is not indicated.
3.5.15 STEALTH MODE (HIGH TIER ONLY)
The stealth mode disables the following tones and
indicators so that they do not reveal that the trans-
mitter has been keyed or the presence of someone
using the transceiver. However, the receive (speaker)
audio and display remain enabled in the stealth mode.
• All supervisory tones (see Section 3.5.17)
• The front panel tri-color indicator
• Display backlight
The stealth mode is available with high tier
models only, and is selected by the Stealth option
switch or menu STEALTH parameter (see Section
3.6.2). The above functions are disabled immediately
when the switch is pressed, and there is no special
indication that this mode is selected. With the menu
mode, the tones and indicator are disabled immedi-
ately when “ON” is selected, and the backlight
remains enabled until the menu mode is exited. If the
stealth mode is not selectable by a switch or the menu,
it is fixed in the on or off condition by programming.
3.5.16 TIME-OUT TIMER
General
The time-out timer disables the transmitter if it is
keyed continuously for longer than the programmed
time. It is programmed in half-minute increments from
0.5 - 5.0 minutes or it can be disabled. If the trans-
mitter is keyed continuously for longer than the
programmed time, the transmitter is disabled,
“TIMEOUT” is indicated on the lower line of the
display (high tier models only), and the conversation
time-out tone sounds. The timer and tone are reset by
releasing the PTT switch. Ten seconds before time-out