Technical Specification
Reference Guide: SM6610, SM6615, SM6620 and SM6625 Satellite Modulators
Page B-9
ST.RE.E10152.2
Item Specification
Symbol rate range:
1 to 48 Msymbol/s (Standard)
0.2 to 66 Msymbol/s (Extended symbol rate option)
NOTE…
For certain combinations of modulation format, FEC code rate
and input packet size, the maximum symbol rate may be limited to
lower values than indicated above due to an input bit-rate
limitation of 213 Mbit/s imposed by the ASI input interface.
Symbol rate step size:
1 symbol/s
Symbol rate tracking range:
±
122 ppm (applicable only when rate adaptation OFF)
Symbol rate error:
Determined by input data rate accuracy (within tracking range, rate adaptation OFF)
<
±
20 ppm (rate adaptation ON)
Spectrum roll-off factor:
20%, 25%, 30%, 35% selectable
Spectrum sense:
Normal / inverted
Transmission modes:
Modulation on/off
Carrier on/off
Carrier frequency:
950-1750 MHz, tuneable in 1 kHz steps
Carrier frequency error:
<
±
35 Hz versus temperature
<
±
1 kHz ageing over 10 years
Carrier ON/OFF ratio:
>60 dB
Carrier suppression:
>35 dB
Phase noise (continuous):
<
−
46 dBc/Hz at 10 Hz offset
<
−
66 dBc/Hz at 100 Hz offset
<
−
76 dBc/Hz at 1 kHz offset
<
−
86 dBc/Hz at 10 kHz offset
<
−
96 dBc/Hz at 100 kHz offset
<
−
120 dBc/Hz at 1 MHz offset and above
Phase noise (discrete
sidebands):
<
−
70 dBc
Spurious outputs (modulated
carrier):
<
−
60 dBc/4 kHz over the frequency range 500 MHz to 2500 MHz but excluding the
frequency range of the wanted output signal (equal to
±
1.06
×
Symbol Rate about the
carrier frequency, as defined by the spectrum mask Figure A.1 in EN 300 421)
Spurious outputs (unmodulated
carrier):
<
−
55 dBc over the frequency range 500 MHz to 2500 MHz, each component
Noise floor (N
0
/C): <
−
120 dBc/Hz
Main / monitor output isolation
(both directions):
>30 dB, 950-1750 MHz
Содержание SM6610
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