User's Manual

8 TRM SB Integration Guide MDS 05-4121A01, Rev. 02
1.1 Modem Speed versus Channel Bandwidth
The transceiver may be configured by the user to one-of-six
arrangements dependent on the permissible values of over-the-air data
baud rate (
BAUD
), Gaussian filtering (
BT
), and channel bandwidth (
BW
).
The valid configurations are:
The current configuration will be displayed by the
MODEM
command.
These parameters are independent of any other user-controllable
operating parameter.
1.2 Frequency Coverage
The radio is available for operation between 410–470 MHz. Any
combination of transmit and receive frequencies can be programmed
within the range of the transceiver, including a simplex (TX = RX) pair.
1.3 Radio Operating Modes
Single Frequency (Simplex) Operation
Single frequency operation (also known as simplex) is a special case of
switched carrier operation. Single frequency operation is
automatically
selected whenever the transmit and receive frequencies are set to the
same value.
Switched-Carrier Operation (Half-Duplex)
Switched-carrier operation is a half-duplex mode where the master
station transmitter is keyed to send data and unkeyed to receive. The
transceiver operates in switched-carrier mode and is keyed when data is
present.
Table 1. Permissible Data Configurations
Baud (bps)
Receive
Bandwidth
(BW) BT
19200 25.0 kHz .3
16000 25.0 kHz .3
9600 25.0kHz .5
9600 12.5 kHz .3
8000 25 kHz .5
8000 12.5 kHz .3
4800 25.0 kHz .5
4800 12.5 kHz .5