Wegener UNITY4650, Руководство пользователя

Страница: 14 / 92

Unity 4650 User’s Manual
800034-01 Rev. A 14 wegener.com
Table 2: Transport In Options
Characteristic Specification
DVB-QPSK RECEIVER OPTION (No RF Switch)
RF INPUT
Input Impedance 75
Ω
unbalanced
Input VSWR, 75-
Ω
system < 2.1:1 (9.0 dB R.L. min), 950-1450 MHz
< 3.0:1 (6.0 dB R.L. min), 1450-2150 MHz
Surge Resistance Guaranteed survival from up to 10 direct-coupled 8kV dis-
charges (per IEC 801-2)
RF TUNING
Input Frequency Range 950 to 2150 MHz
LO Leakage at Input
≤
-50 dBm
Symbol-rate Range 2 to 45 Msps (may be limited by Transport Rate limits)
Tuning Resolution 10 kHz
Input Signal Level Range -25 to -65 dBm
Signal Level Warning Limits warns 10/-5 dB of upper limit and +5/-10 dB of lower limit
Maximum Aggregate Input Power -5 dBm min
DEMODULATOR/FEC
Modulation QPSK (
α
=.35) per DVB (EN 300 421)
Carrier acquisition range ±1 MHz or ± 10% of symbol-rate QPSK, whichever is greater
Max E
b
/N
0
@ Quasi-error-free threshold
(less than one uncorrected error-event per
hour)
Per EN300 421:
QPSK R=1/2: 4.5 dB,
QPSK R=2/3: 5.0 dB,
QPSK R=3/4: 5.5 dB,
QPSK R=5/6: 6.0 dB,
QPSK R=7/8: 6.4 dB
RF Power Level Estimator
(locked to carriers or not) Unitless metric SIGNAL corresponds to input power as follows:
above -25dBm
-25dBm
-35dBm
-45dBm
-55dBm
-65dBm
below -65dBm
no signal Extrapolated from 90 up to 100+
90
70
50
30
10
Extrapolate from 10 down to <0
<0
Accuracy: unit to unit <±5 dBm; over frequency <±10 dBm