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with an LTR-Net or LTR system selected, scanning
halts and "NOT CONV" is displayed, but monitoring
is not enabled. Refer to Section 2.3.11 for more infor-
mation on channel monitoring.
2.11.3 TRANSMIT DISABLE ON BUSY
The Transmit Disable On Busy feature automati-
cally disables the transmitter if the selected system
(channel) is busy and it has not been monitored when
the PTT switch is pressed. When the transmitter is
disabled by this feature, "DSBL BSY" is indicated in
the display as follows:
While the PTT switch is pressed, the receiver is
unsquelched so that activity on the channel can be
monitored. The PTT switch must be released and then
pressed again to make another call attempt. Occasion-
ally, a busy condition may be detected even though no
one is talking. To key the transmitter in this case,
release the PTT switch and then immediately press it
again.
Some repeaters may have delayed drop-out (hang
time) which causes this feature to disable the trans-
mitter even though no busy condition exists. If this is a
problem, there is also a programmable option to allow
transmitting with a busy channel if the correct Call
Guard signal is detected.
The Transmit Disable On Busy feature is enabled
or disabled on each conventional group by program-
ming. If this feature is disabled or if the monitor mode
is selected (see preceding section) the transmitter keys
even if the channel is busy.
2.11.4 SQUELCH ADJUST
This function sets the squelch level used for
conventional calls. The squelch level for LTR-Net and
LTR calls is preset and cannot be changed. If conven-
tional systems are programmed, adjust the squelch as
follows:
1. Select a conventional system and group that is not
busy.
2. Press FCN SQL to select the squelch adjust mode.
The monitor mode is automatically selected in this
mode. The currently selected level is indicated by
"SQ xxx" in the display.
3. Press the
key until receiver noise is heard and
then press
until the noise just mutes. To
decrease or increase the selected level by 10 (or to
the minimum or maximum level if that is not
possible), press FCN
NOTE: Slight readjustment may be required if weak
messages are not heard or unsquelching occurs when
no messages are present.
4. To exit this mode, press the FCN SQL again. This
also occurs automatically 2 seconds after no
activity.
5. If both narrow and wide band channels are used,
perform this adjustment for each type because sepa-
rate settings are maintained.
2.11.5 TALK-AROUND
Normally, all transmissions go through a repeater.
However, there may be times when a user is out of
range of the repeater and unable to talk to anyone even
though the mobile being called is nearby. In this situa-
tion, the repeater talk-around feature can be used to
transmit on the receive frequency to allow direct
mobile-to-mobile communication.
Any conventional group can be programmed for
talk-around. It is then enabled by simply selecting one
of those groups. It is not selectable by an option switch
or indicated in the display unless it is indicated by the
group alpha tag. Talk-around is not available on LTR-
Net and LTR systems.
2.11.6 CALL GUARD SQUELCH
Introduction
Tone, digital, or inverted digital Call Guard
squelch can be programmed on each transmit and
receive channel in any order desired. There is also an
2-27
OPERATION
or FCN
, respectively.
November 2001
Part No. 001-7240-001
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