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SDM-300Ls Satellite Modem
Burst Mode Modulator Operation
B.2.7
Transmit Frequency Change Time
The time between the end of a remote command and the end of the modem reply for
frequency change and synthesizer lock will be < 200 mS.
B.2.8
Phase Noise
1. The phase noise of the transmit IF output carrier is no worse than:
2. Fundamental AC line spurious is -42 dBc or lower.
3. The sum of all the single sideband spurious, from 0 to 0.75 x symbol rate, is
B.2.9
Transmit IF Output Switch
When set to off, no signal present at the output is greater than -60 dBm, measured in a
3 kHz bandwidth from 0 to 500 MHz.
B.2.10
Transmit IF Power
The TX-IF power is operator selectable from -5 to -30 dBm, in 0.1 dB steps, with an
accuracy of ± 0.5 dB. The maximum drift due to temperature change over the specified
range is ± 0.5 dB.
As an option the output can be selectable from +5 to -20 dBm, in 0.1 dB steps, with an
accuracy of ± 0.5 dB. The maximum drift due to temperature change over the specified
range is ± 0.5 dB.
B.2.11
Modulator Power Offset
An offset to the displayed IF output power may be entered from -99.0 to +99.0 dB, in
0.1 dB steps.
dBc/Hz
-66.0
-76.0
-86.0
-96.0
-96.0
-42 dBc or lower.
Distance from Carrier
100 Hz
1 kHz
10 kHz
100 kHz
1 MHz
B–4
Revision 1
MN/SDM300L3.IOM
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