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OPERATION
2-9
Revised January 2001
Part No. 001-9800-501
Off - The transmitter keys even if the channel is busy.
Noise - The transmitter is disabled if any signal is
detected on the channel.
Tone - The transmitter is disabled if the detected
squelch coding is not correct.
If busy override is permitted by programming, it
is possible to transmit even when the transmitter is
disabled by this feature. Simply release the PTT switch
and then quickly press it again.
2.4.6 CALL GUARD SQUELCH
General
Call Guard
®
squelch (also called CTCSS/DCS
signaling) may be programmed on conventional chan-
nels. This feature eliminates distracting messages
intended for others using the channel by using a
subaudible tone or digital code to control the squelch.
This tone or code is unique to a user or talk group on
that channel. It is transmitted by the mobile placing a
call, and if Call Guard squelch is programmed in the
mobile receiving the call, it must detect the correct
tone or code to receive the call.
Call Guard Squelch Enable/Disable
To disable Call Guard (Selective) squelch so that
all messages on the selected or scanned conventional
channels are heard, take the microphone off-hook (if
off-hook detection is enabled) or press the Normal/
Selective option switch if programmed. Then to re-
enable Call Guard squelch, place the microphone back
on-hook or press the Normal/Selective switch again.
When Call Guard squelch is disabled by the
option switch, “SQ NORM” is flashed on the lower
line of the display, and when it is enabled, “SQ SLCT”
is flashed. The mode selected by this switch does not
change when other channels are selected or power is
cycled. Call Guard squelch can also be disabled by the
monitor mode described in Section 2.4.4.
2.4.7 PENALTY TIMER
A penalty timer may be programmed on conven-
tional channels to prevent transmissions for a time
after the time-out timer described in Section 2.3.7
disables the transmitter. The penalty timer starts when
the PTT switch is released after the transmitter has
been disabled. If the PTT switch is pressed during the
penalty time, the time-out indication occurs again. A
beep sounds when the penalty timer expires and the
transmitter can then be keyed.
2.4.8 CONVERSATION TIMER
A conversation timer can be programmed on
conventional channels to limit the total length of a
conversation rather than just the length of each trans-
mission as with the time-out timer. This timer is reset
when the time between transmissions exceeds the
penalty time just described. A warning tone sounds 5
seconds before the conversation timer expires. When it
expires, the transmitter is disabled and a warning tone
sounds. The transmitter remains disabled for the
length of the penalty time, and a beep sounds when it
can be keyed again.
2.4.9 REPEATER TALK-AROUND
Normally, all transmissions go through a repeater
which usually increases range. However, if out of
range of the repeater, you cannot talk to anyone else
on that channel even though the mobile you are calling
may be only a short distance away. To allow commu-
nication when this situation occurs, repeater talk-
around can be used to allow direct communication
with a mobile without going through a repeater.
Repeater talk-around can be selected if the
Repeater Talk-Around option switch is programmed.
When talk-around is enabled by this switch, the
icon is displayed and “RTA ON” is flashed on the
lower line of the display. Then when it is disabled by
pressing the switch again, that icon is no longer
displayed and “RTA OFF” is flashed. Changing chan-
nels or turning power off does not change the selected
talk-around mode.
2.4.10 POWER OUTPUT SELECT
If the High/Low Power option switch is
programmed and power selection is permitted on the
current channel by programming, either high or low
transmitter power can be selected. Pressing this switch
toggles the power setting. The new level is flashed on
the lower line of the display when this switch is
pressed as “HI POWER” or “LO POWER”. If power