Comtech EF Data SDM-300L3 Installation And Operation Manual page 10

SDM-300L3 Satellite Modem
Preface
14.5 L-Band Modulator Specifications ............................................................................ 14-6
14.5.1 Digital Data Rate .................................................................................................................14-6
14.5.2 Modulation and Encoding Types .........................................................................................14-8
14.5.3 Scrambling Types................................................................................................................14-9
14.5.4 Modulator Frequency Reference.........................................................................................14-9
14.5.5 Modulator Spurious Emissions ..........................................................................................14-10
14.5.6 Modulator Phase Noise .....................................................................................................14-10
14.5.7 Modulator IF Output Spectrum Shape...............................................................................14-10
14.5.8 L-Band INMARSAT Spurious Emissions...........................................................................14-10
14.5.9 Differential Encoder ...........................................................................................................14-11
14.5.10 BPSK Bit Ordering.........................................................................................................14-11
14.5.11 Interleaver (Reed-Solomon Codec)...............................................................................14-11
14.5.12 Modulator Transmit Frequency (IF) ...............................................................................14-11
14.5.13 Transmit Frequency Change Time ................................................................................14-11
14.5.14 Modulator Transmit IF Output Switch............................................................................14-11
14.5.15 Modulator Transmit IF Power ........................................................................................14-11
14.5.16 Modulator Power Offset.................................................................................................14-12
14.5.17 Modulator I / Q Imbalance .............................................................................................14-12
14.5.18 Modulator Output Noise Floor .......................................................................................14-12
14.5.19 Modulator Spectrum Rotation........................................................................................14-12
14.5.20 Modulator Output Return Loss ......................................................................................14-12
14.5.21 L-Band ODU Reference Signal .....................................................................................14-12
14.5.22 L-Band ODU Control and Monitor .................................................................................14-12
14.5.23 Modulator Transmit IF Test Modes................................................................................14-12
14.5.24 L-Band ODU Supply Voltage.........................................................................................14-13
14.5.25 ODU DC Current Sense ................................................................................................14-13
14.6 Encoding .................................................................................................................. 14-13
14.6.1 BPSK Encoding .................................................................................................................14-13
14.6.2 OQPSK Encoding..............................................................................................................14-14
14.6.3 8PSK Encoding .................................................................................................................14-14
14.7 L-Band Demodulator Specifications...................................................................... 14-15
14.7.1 Digital Data Rate ...............................................................................................................14-15
14.7.2 Demodulation and FEC Decoding Types ..........................................................................14-17
14.7.3 Descrambling Types..........................................................................................................14-18
14.7.4 Differential Decoder...........................................................................................................14-18
14.7.5 BPSK Bit Ordering.............................................................................................................14-18
14.7.6 Deinterleaver (Reed-Solomon Codec) ..............................................................................14-18
14.7.7 Demodulator Spectrum Rotation .......................................................................................14-19
14.7.8 Receive Frequency............................................................................................................14-19
14.7.9 Input Overload ...................................................................................................................14-19
14.7.10 Demodulator Input Return Loss.....................................................................................14-19
14.7.11 LNB Prime Power ..........................................................................................................14-19
14.7.12 LNB Band Control..........................................................................................................14-19
14.7.13 LNB Reference Signal ...................................................................................................14-19
14.7.14 Receive Input Power (Composite).................................................................................14-20
14.7.15 Demodulator Input Shape..............................................................................................14-20
14.7.16 Receive Input Power (Desired Carrier) .........................................................................14-21
14.7.17 Demodulator Channel Spacing/Adjacent Carrier Performance.....................................14-21
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MN/SDM300L3.IOM