Comtech-ef-data MIDAS 4 System and Design Uživatelský manuál stáhnout pdf (Strana 104)

System and Design Manual, Revision 2

6–6 Traffic Node

System Specifications

Operating Frequency Range For SNM-1000/1010: 50 to 180 MHz, in 1 Hz steps

For SNM-1010L: 950 to 1750 MHz, 100 Hz steps

Digital Data

Continuous Mode:

Receive Data Rate 19.2 kbps

Symbol Rate 19.2 kHz

Demodulation QPSK

Forward Error Correction Viterbi, K=7, 1/2

Data Scrambling Intelsat V.35

External Reference 1, 5, 10, 20 MHz

Burst Mode:

Transmit Data Rate 19.2 kbps

Modulation QPSK

Forward Error Correction Viterbi soft-decision, R=1/2

Plesiochronous Buffer 2 to 98 ms, in 2 ms steps

Modulator

Data Clock Source Internal or External

Output Spectrum Meets IESS-308/309 EFD Closed

Output Power For SNM-1000/1010: -5 to -30 dBm, adjustable in 0.1 dB steps

For SNM-1010L: 0 to –40 dBm, in 0.1 dB steps

Output Spurious For SNM-1000/1010: < -55 dBc, 0 to 500 MHz (4 kHz band)

For SNM-1010L: < -50 dBc(4 kHz band)

Output Return Loss

For SNM-1000/1010: ≥ 20 dB

For SNM-1010L: ≥ 14 dB

Output Impedance

For SNM-1000/1010: 75Ω

For SNM-1010L: 50Ω

Internal Stability For SNM-1000/1010: ± 10 ppm

For SNM-1010L: ± 0.01 ppm

Outdoor Reference (Center conductor of

IF output connector)

For SNM-1010L: On or Off, 10 MHz ± 0.01 ppm @ 0 dBm

± 0.5 dB

Output Unit Voltage (Center conductor of

IF output connector)

For SNM-1010L: On or Off, 24 VDC @ 4.0 amps or

48 VDC @ 3.0 amps

Output Stability

For SNM-1010L: ± 0.5 dB

Output Phase Noise

For SNM-1010L:

< -63 dBc/Hz @ 100 Hz

< -73 dBc/Hz @ 1 kHz

< -83 dBc/Hz @ 10 kHz

< -93 dBc/Hz @ 100 kHz

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