Ericsson RX1290 用户手册
Options
6.1
Hardware Enabled Options
These options require extra hardware to be fitted to the unit. Contact the Customer
Services Helpdesk for details (see Preliminary Pages).
Services Helpdesk for details (see Preliminary Pages).
6.2
DVB-S2 Input Cards (RX1290/HWO/DVBS2 and
RX1290/HWO/DVBS2/IF/CONST)
RX1290/HWO/DVBS2/IF/CONST)
6.2.1
General
The DVB-S2 Input card supports DVB-S, QPSK demodulation and DVB-S2, QPSK
and 8PSK demodulation.
and 8PSK demodulation.
Two options are available. RX1290/HWO/DVB-S2 offers four L-band inputs,
RX1290/HWO/DVB-S2/IF/CONST offers three L-band inputs plus an IF monitor
input plus received constellation output.
RX1290/HWO/DVB-S2/IF/CONST offers three L-band inputs plus an IF monitor
input plus received constellation output.
6.2.2
Connector Details - L-Band Inputs
Connect the L-band output of a suitable LNB to the F-type
connector either directly or via a suitable attenuator giving
adequate consideration to lightning and surge protection.
The active input is chosen using the input Status Menu
(Menu 2).
connector either directly or via a suitable attenuator giving
adequate consideration to lightning and surge protection.
The active input is chosen using the input Status Menu
(Menu 2).
In most cases an attenuator will not be required. The following list summarizes the
circumstances when one should be used.
circumstances when one should be used.
When the desired input level is greater than the specified maximum permissible
(-25 dBm).
(-25 dBm).
When the down-lead is a short length of low-loss cable and the LNB in use has a
poor return loss (7 dB min).
poor return loss (7 dB min).
When the Receiver is receiving one of many carriers in a multi-carrier FDM system
and the level of the wanted signal is close to the specified maximum permissible.
and the level of the wanted signal is close to the specified maximum permissible.
The specification for this connector is given in Annex B, Technical Specification.
IN 1/2/3/4
EN/LZT 790 0003/2 R1A
6-3