EFJohnson LTR-Net 002-9803-601 - Manual (Page 46)

CONVENTIONAL FEATURES
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A conventional system must be selected to enable monitoring.
If the microphone is taken off-hook with an LTR-Net or LTR system
selected, scanning halts (unless off-hook detection is disabled) but
monitoring is not selected.
Transmit Disable On Busy
The Transmit Disable On Busy feature automatically disables
the transmitter if the selected group (channel) is busy and it has not
been monitored when the PTT switch is pressed. When the trans-
mitter is disabled by this feature, the busy tone sounds briefly and
“DSBL BSY” is indicated on the lower line of the display.
While the PTT switch is pressed, the receiver is enabled so that
activity on the channel can be monitored. The PTT switch must be
released and then pressed again to make another call attempt. Occa-
sionally, 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.
There is also a programmable option with this feature 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 dealer programming. If this
feature is disabled or if monitoring has been performed by taking the
microphone off-hook, the transmitter keys even if the group is busy.
Talk-Around
Normally, all transmissions go through a repeater which usually
increases range because the repeater transmits at a higher power
level and has a higher antenna. However, this means that if you are
out of radio range of the repeater, you cannot talk to anyone even if
the mobile you are calling is only a short distance away. To allow
communication if this occurs, talk-around groups can be
programmed which enable direct mobile-to-mobile communication
without going through a repeater.