ASTRO Direct Digital X-QAM twin 3, Руководство по эксплуатации

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6 Technical data
14
Typ X-QAM twin 3 X-QAM twin 5 X-QAM twin 6
Order no. 330 581 330 584 330 585
QPSK-Demodulator:
Input Freq.-range [MHz] 920 – 2150
SAT IF input [
Ω
] F-jack, 75
Input level [dBµV] 50 – 80
Spectrum shape [%] 35
Input data rate
adjustable [MBaud] 10,0– 30,0 2,4– 30,0
Viterbi-Decodierung
(DVB-Standard) 1/2; 2/3; 3/4; 5/6; 7/8, automatic/manuel
QAM-Modulator:
Modulation
16-, 32-, 64-, 128-, 256-QAM (digital realization)
Signal processing
compliant to DVB-Standard
Spectrum shape
cos-roll-off [%] 15
FEC
Reed-Solomon (204,188)-Code
Data rate adjust
✔ ✔ ✔
PCR-Correction
✔ ✔ ✔
PID-Filterung –––
✔ ✔
NIT-Handling –––
✔ ✔
Output symbol rate [MBaud] dep. on input data ratio 3,45 – 6,9
Bandwidth [MHz] dep. on input data ratio 4–8, depending on symbol ratio
Brutto data rate [MBits] dep. on input data ratio ca. 13,8 … 55,2
HF output:
Connections
[
Ω
] IEC-Jacks, 75
Frequency range
[MHz] 47–862 (C2–C69) (1-MHz-steps adjustable)
Output level
[dBµV] 80 … 96, adjustable
MER
(Equalizer, 64 QAM) [dB]
≥
37
≥
40
≥
45
Shoulder attenuation
[dB]
≥
49
≥
49
≥
59
Spurios frequency distance
40–862 MHz [dB] > 60 discrete disturbancies > 57 noise similar disturbancies
>950 MHz > 20 referred to 100 dBµV system level und 90 dBµV operation level