Televes HDTV TRANSMODULATOR - Dual 8PSK to QAM, Руководство пользователя

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HDTV TRANSMODULATOR - Dual 8PSK to QAM
8
4.0 Block diagram
Up-converter A
Up-converter B
QAM Modulator
A
Demodulator
A
QAM Modulator
B
Demodulator
B
Input
Stage
Output
Stage
PORT 1
PORT 2
QAM
Output
4.1 8PSK to QAM transmodulator
4. Technical Specifications
Table 1 . Technical specifications
Satellite
input
Input selection options SEE TABLE 2 Symbol rate Mbaud 10-30
Input frequency (agile) MHz 950 - 2150
FEC
QPSK Legacy
Viterbi 1/2, 2/3, 3/4, 5/6, 7/8
Reed Solomon (204, 188)
Frequency steps MHz 1 8PSK
Interactive Turbo Error Correction
Reed Solomon (204, 188)
Input modulation
QPSK Legacy (EN300421)
Turbo 8PSK - Turbo QPSK
Transmission filter Square Root Raised Cosine
Input level dBm -70 to -20
Roll-off Factor %
QPSK legacy 35
PORT1-PORT2 isolation dB > 25
(1)
8PSK-TC
QPSK-TC
20
Loop-through losses dB < 1.5
In/Out connectors type “F” female
Input impedance ohm 75
QAM
Modulator
Modulation format QAM 16, 32, 64, 128, 256, 512, 1024
Symbol rate (max) Mbaud 6.9
Roll-off factor % 15 (12 for 1024 QAM)
RF Output
Frequency range (agile) MHz 57 ··· 999 (EIA Ch 2 to 158) Loop-through losses dB < 1.5
Frequency steps MHz 1 MER dB > 40
Output level dBmV 38 ± 2 In/Out connectors type “F” female.
Adjustable level (min.) dB 20 Out Impedance ohm 75
General
Powering voltage Vdc 24 Consumption 24V mA 600
Protection index IP 20 Working temperat. ºF <113 (use forced ventilation at higher temp)
(1) When using dual inputs, input signals should be correctly balanced to avoid undesired results.