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Datum Systems PSM-500L Manual do Utilizador Página 7

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Datum Systems PSM-500, 500H & 500L VSAT/SCPC Modem Specification
Rev. 0.86
A-7
Demodulator Specifications
IF Input
Input Frequency Range Standard:...................50.000 to 90.000 MHz. (100 to 180 MHz Optional)
Hybrid & L-Band): ......... 950.000 to 1900.000 MHz
Tuning Method: ................................................ Via internal synthesizer.
Input Carrier Level: ..........................................-20 to -84 dBm total. 40dB range window shifts
.......................................................... .with the data rate. Lower levels at lower rates.
Acquisition/Tracking Range:............................ ± 100 Hz and ± 1.25 MHz in 1 Hz increments.
Smart reacquisition: ......................................... In “Search” mode the demodulator will search
.......................................................... for return of a lost carrier within a specified
.......................................................... range for a selected time before reverting to full
.......................................................... acquisition range.
Reacquisition range:.........................± 100 Hz and ± 1.25 MHz in 1 Hz increments
Reacquisition sweep time: ...............0.1 to 6000 seconds in 0.1 second increments.
Input Impedance: Standard........................ Programmable 50 or 75Ω.
Hybrid & L-Band ...........75Ω.
Input Return Loss: Standard........................ 20 dB. (17 dB with 140 MHz IF option.)
Hybrid & L-Band ...........10 dB minimum, 14 dB typical.
Modulation Technique:..................................... BPSK, QPSK, OQPSK, 8PSK, 8QAM or 16QAM Selectable.
Type of demodulation: ..................................... Continuous Coherent.
Receive Synthesizer
Tuning Step Size:............................................. 1 Hz steps.
Frequency Stability: Standard & Hybrid........ ± 2.0 ppm. (176 Hz max) internal reference
L-Band ..........................± 0.1 ppm. (175 Hz max) internal reference
.......................................................... OR locked to external reference’s stability.
L-Band Note: ................................... The internal 10 MHz OCXO reference can be
.......................................................... used to phase lock an external LNB.
Synthesizer Control:......................................... Front Panel and via the Serial Control port.
Receive Baseband Processing
Data Rate:........................................................ Variable under program control and dependent on
.......................................................... Feature Set, FEC selected and interface type.
.......................................................... See Tables 2 to 5 above.
Note: Maximum rates are limited using Reed-Solomon and IBS Multiplexer Options.
Settability ........................................................ Any rate settable in 1 bit per second increments.
Data Clock Tracking Range ............................> +/-400 ppm.
Data Rate Change Settling Time:.................... < 100 mSeconds.
Baseband Filter:...............................................Digital, n=6 Butterworth filter response.
Forward Error Correction: ............................ See Table 6 above for current modes and rates.
Viterbi ............................................... Convolutional encoder, k= 7.
.......................................................... Rate 1/2. G0 code = 171 octal,
.......................................................... ............ G1 code = 133 octal.
.......................................................... Rate 3/4, 5/6 or 7/8 using punctured code
Trellis Code Modulation (TCM): ....... Rate 2/3 in 8PSK only, may use R-S.
Standard Reed-Solomon Concatenated Codec: Available in Viterbi or TCM.
R-S Rates ..................... Disabled, IESS-308, IESS-309, IESS-310,
CT220-200 and custom.
Optional Turbo Product Codes and S-Tec Codecs Available.
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