Reference Manual

Table Of Contents
Making and receiving calls
2110 SSB Transceiver Reference Manual 173
Making a call
Listen Before Transmit Mode
The 2110 SSB Transceiver is capable of listening to a channel before initiating a call on
the channel. If the Cfg LBT Mode in the Control List is enabled, the transceiver will
detect whether or not there is traffic on the selected channel, that is, the channel is
occupied. The transceiver will listen on a channel for the length of time specified in the
Cfg LBT Period entry in the Control List. The transceiver will try busy channels twice
before reporting that they are busy.
The Cfg LBT Mode may be set to Enabled, Override allowed, or Disabled.
When the Cfg LBT Mode is set to Enabled, and the transceiver detects that the
channel(s) tried is(are) busy, it will prompt you to try the call again. You can:
•press CALL to try the call again using LBT
press to select a new channel, then press CALL to make a call on this channel
using LBT
When the Cfg LBT Mode is set to Override allowed, and the transceiver detects that the
channel(s) tried is(are) busy, it will prompt you to try the call again. You can:
•press CALL to try the call again using LBT
hold CALL to try the call again without LBT (send the call regardless of any
detected traffic)
press to select a new channel, then press CALL to make a call on this channel
using LBT
hold to select a new channel and try the call on this channel without LBT (send
the call regardless of any detected traffic)
Calls using the Emergency call type or calls made through the key will override the
LBT Mode if it is enabled at either level. For information on setting up the key see
page 150, Setting up the emergency key.
NOTE
If you change the setting in the Cfg LBT Mode entry in the Control List
you must switch the transceiver off then on again for the change to take
effect.
NOTE
If only one channel was tried and found to be busy using LBT, you can
listen for traffic on the channel then, if clear, override LBT by holding
CALL.