Comtech EF Data SDM-300L3 - Manual (Page 325)

SDM-300L3 Satellite Modem Revision 0
Specifications MN/SDM300L3.IOM
14–19
14.7.7 Demodulator Spectrum Rotation
The operator can select Normal, Inverted, or Auto-Detect of the spectrum for the
Demodulator Input.
14.7.8 Receive Frequency
The range of the input spectrum is from 950 to 1750 MHz, in 100 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
± 0.01 PPM.
14.7.9 Input Overload
The modem will not be damaged by a continuous receive input of +20 dBm.
14.7.10 Demodulator Input Return Loss
The demodulator input return loss shall be ≥ 10 dB into a 75 Ω load.
14.7.11 LNB Prime Power
The DC input on the center conductor of the L-Band connector shall be selectable for
OFF, 13V, 18V, and 24V.
14.7.12 LNB Band Control
The IDU shall provide a 22 kHz tone outbound of L-Band input connector per DiSEq 4.2.
14.7.13 LNB Reference Signal
The modem shall be capable of providing a 10 MHz reference, that is On/Off-selectable,
on the center conductor of the RX input connector. The following build options will be
allowed:
• Option 1: 1.0 ppm for use with rack mount converters or internally referenced
LNBs.
• Option 2: 0.02 ppm for use with externally referenced LNBs.