Technical Specification
Reference Guide: SM6610, SM6615, SM6620 and SM6625 Satellite Modulators
Page B-7
ST.RE.E10152.2
Item Specification
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:
50-180 MHz, tuneable in 1 kHz steps
Carrier frequency error:
<
±
1 kHz (all causes over 10 years)
Carrier ON/OFF ratio:
>60 dB
Carrier suppression:
>40 dB
Phase noise (continuous):
<
−
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 0 to 500 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, each component
Noise floor (N
0
/C): <
−
120 dBc/Hz
Main / monitor output isolation
(both directions):
>30 dB, 50-180 MHz
Table B.9: IF OUT MONITOR Specification
Item Specification
Safety status:
SELV
Connector type:
BNC female 75
Ω
Connector designation:
IF OUT MONITOR
Output impedance:
75
Ω
Output power:
−
20 dB
±
2 dB relative to main IF output power
Return loss:
>20 dB, 50-180 MHz
