4RF Aprisa XE User Manual - page 72
70 | Configuring the Terminal
Aprisa XE User Manual
RX and TX Frequency
The local terminal transmit frequency must match the receive frequency of the remote terminal and the
remote terminal transmit frequency must match the receive frequency of the local terminal.
When setting the RX and TX frequency with SuperVisor, the frequency entered is automatically resolved to
the synthesizer step size for the terminal frequency band e.g. an ETSI 1400 MHz band frequency entry of
1474,010,000 Hz will be changed to 1474,012,500 Hz (see synthesizer step size in the table ‘Frequency
Bands’ on page 287).
The RX and TX frequency entered must be:
Within the frequency band limits of the chosen RF frequency band of the terminal as specified in
‘Frequency Bands’ on page 287. e.g. for an ETSI frequency band of 1400 MHz, the frequency band
limits are 1350 to 1550 MHz.
Within the TX / RX passband of the duplexer fitted in the terminal e.g. for a frequency band of
1400 MHz, the standard duplexer passband is 7 MHz and the TX / RX split is 48 MHz (see Duplexer
(bandpass) ‘Duplexers’ on page 301).
The duplexer passband and center frequencies are written on the duplexer label.
The TX and RX frequencies are validated against the duplexer parameters entered on SuperVisor Link or
Local or Remote > Terminal > Duplexer (see ‘Setting the Duplexer Parameters’ on page 79).
If the TX or RX frequency entered is not valid i.e. outside the operating range of the duplexer, a warning
message will popup. OK accepts the frequency entered and cancel rejects the frequency entered.
Important: Changing the remote terminal RX or TX frequency will disable all management communication
to the remote terminal but by changing the local terminal to match the remote terminal, the radio link
will be restored as will the management communication
BUT if the remote terminal RX or TX frequency is changed to be outside the operating range of the
terminal, changing the local terminal to match the remote terminal will not restore the radio link and all
management communication will be lost.
The remote terminal TX and RX frequencies cannot be changed simultaneously i.e. change one direction
and ‘Apply’ the change and then change the other direction and ‘Apply’ the change.
To change both TX and RX frequencies:
1. Change the remote terminal RX frequency and ‘Apply’ the change. The radio link will fail.
2. Change the local terminal TX frequency to that of the remote RX frequency and ‘Apply’ the change.
The radio link will restore.
3. Change the remote terminal TX frequency and ‘Apply’ the change. The radio link will fail.
4. Change the local terminal RX frequency to that of the remote TX frequency and ‘Apply’ the change.
The radio link will restore.
Transmit power
The transmitter power is the power measured at the duplexer output port.
The transmitter power adjustment range varies depending on the Modulation type and frequency band of
the terminal. For ETSI transmitter power range see ‘Transmitter Power ETSI’ on page 290.