Comtech EF Data SDM-300A - Manual (Page 372)

SDM-300A Satellite Modem Revision 6
Specifications MN/SDM300A.IOM
19–16
19.5.6 Deinterleaver (Reed-Solomon Codec)
• QPSK - Depth 4 (IBS, IDR, D&I)
• 8-PSK - Depth 4 (No Overhead, IBS, D&I)
• QPSK/OQPSK - Depth 4, 8, 16 (Closed Network, ASYNC)
• 8-PSK - Depth 8 (IDR)
19.5.7 Demodulator Spectrum Rotation
Select Normal or Inverted spectrum for the Demodulator Input.
19.5.8 Receive Frequency (IF)
• The range of the input IF spectrum can be selected by the operator from 50 to 180 MHz,
in 1 Hz steps.
• The actual value of offset from the programmed frequency is available to the operator on
the front panel as well as the remote port. The resolution of this value is 1 Hz. Monitor
accuracy is
± 10 PPM.
19.5.9 Receive Input Power (Desired Carrier)
The modem can meet the specified BER and automatically adjust to a RX IF input power of
-30 to -55 dBm. Monitor accuracy is
± 2.5 dB.
19.5.10 Receive Input Power (Composite)
The modem can operate to its specified performance under all the following conditions:
• The sum of all carriers is ≤ -5 dBm.
• The sum of all carriers within 10 MHz from the desired is ≤ +30 dBc.
• The sum of all carriers is ≤ +40 dBc.
19.5.11 IF Input Overload
The modem will not be damaged by a continuous RX IF input of +20 dBm.