Spurious Emissions; Modulator Phase Error; Transmit If Test Modes; Modulator Spectrum Rotation - Comtech EF Data SNM-1001L Installation And Operation Manual

SNM-1001L Satellite Modem
Burst Mode Modulator Operation
C.2.13

Spurious Emissions

Spurious emissions are measured relative to the power of the modulated carrier. The
measurement is done with the carrier on in continuous mode and modulated by the correct
data/clock signal. Spurious emissions measured in a 3 kHz bandwidth at the transmit IF output
are:
C.2.14

Modulator Phase Error

The modulator will have less than 2° of phase error
C.2.15

Transmit IF Test Modes

The following transmit IF test modes are available to the operator. Spurious emissions in the
following test modes will be ≤ -30 dBc.
TX IF Test Modes
CW:
Offset:
Dual sideband:
C.2.16

Modulator Spectrum Rotation

The operator can select normal or inverted spectrum of the Modulator Output.
0 to 500 MHz (-5 to -30 dBm)
0 to 500 MHz (+5 to -20 dBm > 64 kbps)
0 to 500 MHz (+5 to -20 dBm < 64 kbps)
Outputs a single carrier at the defined frequency
Dual sideband signal with lower sideband and carrier suppressed
≤ -35 dBc
Suppressed carrier ≤ -35 dBc
C–5
MN/SNM1001L.OM
-55 dBc
-50 dBc
-45 dBc
Remarks
Revision 1