Comtech EF Data SDM-650B Especificaciones descargar pdf (Pagina 333)

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101

SDM-300L3 Satellite Modem Revision 0

Specifications MN/SDM300L3.IOM

15–11

15.5.9 Differential Encoder

The differential encoder takes care of one set of ambiguities due to the error correction

codes being transparent.

• On or off

15.5.10 BPSK Bit Ordering

The encoder has the ability to select whether I is the first bit or Q is the first bit in the

symbol word grouping for compatibility with any system. For standard operation Q is the

first bit.

• Viterbi (Standard/Non-Standard)

• Sequential (Standard/Non-Standard)

• Turbo – Fixed order only

15.5.11 Interleaver (Reed-Solomon Codec)

• OQPSK, QPSK - Depth 4 (IBS, IDR, D&I)

• 8PSK - Depth 4 (No Overhead, IBS, D&I) (IESS-310)

• Depth 8 (Closed Network, Async)

• 8PSK - Depth 8 (IDR) (IESS-310)

15.5.12 Modulator Transmit Frequency (IF)

The range of the output IF the operator from 950 to 1750 MHz in 100 Hz steps can select

spectrum.

15.5.13 Transmit Frequency Change Time

The time between the end of a remote command and the end of the modem reply for

frequency change and synthesizer lock will be < 500 ms

15.5.14 Modulator Transmit IF Output Switch

When set to off, no signal present at the output is greater than -60 dBm, measured in a

4 kHz bandwidth from 55 MHz to 2.4 GHz.

15.5.15 Modulator Transmit IF Power

The TX IF power is operator selectable from 0 to -40 dBm, in 0.1 dB steps, with an

accuracy of ± 1.5 dB. The maximum drift from room temperature value over the specified

temperature range is ± 1.0 dB.

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Comtech EF Data SDM-650B Especificaciones Pagina 333

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