E.F. Johnson Company 98xx LOW TIER, Руководство по эксплуатации

Страница: 34 / 40

CONVENTIONAL FEATURES
34
down the PTT switch (it must be released to make another attempt). The
Transmit Disable On Busy feature can be enabled or disabled on each
channel by programming.
Occasionally, 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 to
allow transmitting with a busy channel if the correct Call Guard signal is
detected.
Talk-Around
Normally, all transmissions go through a repeater. Therefore, if you
are out of radio range of the repeater, you cannot talk to anyone, even if
you are only a short distance away from the mobile you are calling. To
allow communication if this occurs, talk-around can be enabled to allow
direct mobile-to-mobile communication without going through a repeater.
Each selectable conventional channel can be programmed for talk-
around. It is then automatically enabled when the channel is selected.
There is no talk-around indicator, and it cannot be manually selected.
Call Guard Squelch
The Call Guard squelch feature eliminates distracting messages
intended for others using the channel. This is done by using a subaudible
tone or digital code to control the squelch. This tone or code is unique to
a user or a group on that channel. It is transmitted with the voice signal
but is not heard because it is in the subaudible range and attenuated by a
filter. Call Guard squelch can be programmed on each conventional
channel. LTR operation uses ID codes to perform a similar function.
Priority Channel Sampling
The priority channel sampling feature ensures that messages on
priority conventional channels are not missed while listening to a
message on a non-priority conventional channel. A fixed first and second
priority channel can be designated by programming or either priority
channel can be the selected channel.