Datum Systems PSM-500L Bedienungsanleitung PDF herunterladen (Seite 38)

Datum Systems, Inc. PSM-500 Modem Remote Control Protocol

Rev 0.93 12/12/10

B-38

[Mod3-Mod0] = Demod Modulation mode, 4b, 0=BPSK, 1=QPSK, 2=OQPSK, 3=8PSK, 4=8QAM,

6=16QAM

[SpcInv] = Demod Spectrum Invert, 1b, 0=Normal, 1=Inverted

[Filter1-Filter0] = Demod Filter Mask, 2b, 0=IESS, 1=Legacy

[Mode3-Mode0] = Demod Burst Mode, 4b, 0=Normal

[PreLng3-PreLng0] = Demod Burst Preamble Length, 4b, Undefined

[ImpSel] = Demod Input Impedance, 1b, 0=50 Ohms, 1=75 Ohms

Note 1. IF/RF Frequency. The full maximum IF frequency range of either 70 MHz, 140 MHz or L-Band

units can fit into a standard 32 bit unsigned integer definition. The frequency may exceed that if the LNB

LO frequency is set, which caused the modem to calculate and display the RF frequency in this place for

operator convenience. The RF frequencies are typically in the 3 to 15 GHz range, requiring more than 32

bits to hold the calculated value. The 2 byte extension shown makes it a 48 bit number that can easily hold

the full range of values. Most computers however have either 32 or 64 bit variable sizes, and this 48 bit

value will have to be mapped into a 64 bit variable.

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Datum Systems PSM-500L Bedienungsanleitung Seite 38