G e n e r a l i n f o r m a t i o n
15
range of your team’s communication in extreme conditions in the
direct mode. In the first phase, the THR9 cannot participate in calls,
that is, the THR9 user cannot hear or transmit direct mode calls
when it operates as a direct mode repeater. For more information on
the direct mode, see Direct mode on page 57.
p
Transmission barring
When transmission barring is active, the radio does not send any
signals to the network, and only limited network services are
available. In the network mode, the radio can only receive group
calls and status and text messages addressed to talk groups,
providing that the radio is registered to the network. In the direct
mode, the radio can receive direct group calls and statuses. When
transmission barring is active, the radio cannot re-register to the
network, for example, if it is switched off and then on again.
The limited network services in the network mode are only available
in the coverage area of the network cell where the radio was last
registered. The radio cannot register to other network cells while
transmission barring is active, and therefore the area of operation
may be limited.
When transmission barring is active in the network mode, the radio
cannot send the necessary information to the network about
changes in talk groups. When transmission barring is active, you
cannot change the selected group. If you make any other changes
that affect talk groups, such as change the selected folder, home
group, or the scanning priority of a group, you will not be able to
receive further communication from the affected groups. After
transmission barring has been deactivated, the radio can attempt to
negotiate the changes with the network.
If you start to make a
red key call
or an emergency call to an
emergency number programmed into your radio when transmission
barring is active, the radio automatically deactivates transmission
barring and attempts to make the call. See Red key calls and
emergency calls in direct mode on page 62.
