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General, Connector details - l-band inputs, Connector details – if monitor input \(tt1280/hw – TANDBERG High Definition Professional Recevier/Decoder TT1280 User Manual

Page 71: Tt1280/hwo/dvbs2/if/const) -5, General -5, Connector details - l-band inputs -5, 1 general, 2 connector details - l-band inputs

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Reference Guide: TT128x High Definition Professional Receiver/Decoder

Page 6-5

ST.RE.E10141.5

6.4

DVB-S2 Input Cards (TT1280/HWO/DVBS2

and TT1280/HWO/DVBS2/IF/CONST)

6.4.1 General

The DVB-S2 Input card supports DVB-S, QPSK demodulation and DVB-S2,

QPSK and 8PSK demodulation.
Two options are available. TT1280/HWO/DVB-S2 offers four L-band inputs,

TT1280/HWO/DVB-S2/IF/CONST offers three L-band inputs plus an

IF monitor input plus received constellation output.

6.4.2

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).
In most cases an attenuator will not be required. The following list

summarises the circumstances when one should be used.
When the desired input level is greater than the specified maximum

permissible (-25 dBm).
When the downlead is a short length of low-loss cable and the LNB in use

has a 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.
The specification for this connector is given in Annex B, Technical

Specification.

Table 6.3: DVB-S2 Satellite Receiver (L-band) Connector

Input Specification

Connector Type

F-type, Female

Connector designation

IN 1, IN 2, IN 3, IN 4

Pin: Centre
Shield

RF Input
Ground/Chassis

LNB Supply

Refer to the next caution box

Impedance 75

6.4.3

Connector Details – IF Monitor Input
(TT1280/HWO/DVBS2/IF/CONST)

Connect the IF Monitor input to a suitable IF frequency source

e.g. a satellite modulator. The input can be activated using

Input Status Menu (Menu 2).
This monitor input is designed to give error free demodulation

in the presence of a wanted carrier only, for example when

being fed directly from a satellite modulator.

IN 1/2/3/4

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