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Specifications
C.2.7
Transmit Frequency (IF)
The range of the output IF spectrum can be selected by the operator from 50 to 180 MHz,
in 1 Hz steps.
C.2.8
Frequency Reference
SCT, RX Bit Clock, and IF output are locked to the Frequency Reference.
Internal (Standard
Internal High Stability
(Optional)
External Reference Input
(Standard)
Reference Frequency
Output (Optional)
C.2.9
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 < 500 mS.
C.2.10
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
C–8
Stability over the operating temperature range = ± 10 PPM.
Stability over the operating temperature range = ± 0.2 PPM.
The External frequency reference connector is located on the back
panel. This allows Frequency Reference to be locked to an external
reference frequency standard.
The External frequency reference connector can be used as an output
when the High Stability option is installed. When selected from the front
panel, this output can be used to lock other equipment to the Internal
High Stability Reference of the selected modem. The output is 10 MHz,
the level is +10 dBm ± 5 dBm.
dBc/Hz
-66.0
-76.0
-86.0
-96.0
-96.0
-42 dBc or lower.
Impedance
75Ω
Frequency
1, 5, 10 or 20 MHz
≥ +0 dBm < +20 dBm
Amplitude
DC offset
Capacitively coupled
Connector
BNC
Distance from Carrier
100 Hz
1 kHz
10 kHz
100 kHz
1 MHz
SDM-300A Satellite Modem
Rev. 4
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