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Comtech EF Data SNM-1000 User Manual

Page 76

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SNM-1000 Node Control Modem

Revision 3

Operation

MN/SNM1000.IOM

3–34

3.4.5.2.3 DEMODULATOR:DECODER

TYPE

DECODER TYPE

VITERBI


Decoder type selection. Select VITERBI or SEQUENTIAL decoder type.

Notes:

1. Change in EFD, ASYNC, or Custom modem types only.
2. A Sequential Decoder Type and a 3/4 Code Rate combination is

not compatible with a CSC CLOSED Modulator Type.


Press[

←], [→], [↑], or [↓] to move the flashing cursor. Press [ENTER] to execute the

change.

3.4.5.2.4 DEMODULATOR:RX BPSK ORDERING

RX BPSK ORDERING

STANDARD


Receive BPSK bit ordering selection. Select STANDARD or NON-STANDARD

Press[

←], [→], [↑], or [↓] to move the flashing cursor. Press [ENTER] to execute the

change.

3.4.5.2.5 DEMODULATOR:DEMOD

SPECTRUM

DEMOD SPECTRUM

NORMAL


Programmable vector rotation allows the operator to select NORMAL or INVERT for
spectrum reversal of the I and Q baseband channels.

Press[

←], [→], [↑], or [↓] to move the flashing cursor. Press [ENTER] to execute the

change.