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Comtech EF Data SNM-1000 User Manual

Page 50

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SNM-1000 Node Control Modem

Revision 3

Operation

MN/SNM1000.IOM

3–8

3.4.1.1.5 MODULATOR:SCRAMBLER

SCRAMBLER

ON

Displays the scrambler status, either On or Off.

3.4.1.1.6 MODULATOR:DIFF.

ENCODER

DIFF. ENCODER

OFF

Displays the differential encoder status, either On or Off.

3.4.1.1.7 MODULATOR:CARRIER

MODE

CARRIER MODE

NORMAL-MODULATED

Displays the carrier mode of operation as follows:

Normal-Modulated

The carrier mode in normally in this Off position.

Center-CW

Generates a carrier at the current modulator frequency. This can be used to
measure the output frequency.

Offset-CW

Generates a single, upper, side-band-suppressed carrier signal. The upper side-
band is at one-quarter of the symbol rate from the carrier. When inverted
spectrum is selected, this generates a single, lower, side-band-suppressed
carrier.

Dual-CW

Generates a dual side-band suppressed carrier signal. Side-bands are at one-half
of the symbol rate from the carrier. This is used to check the channel balance and
carrier null.

Upon entry, the current carrier mode is displayed with the flashing cursor on the first
character. Press [

↑ ] or [↓ ] to change the carrier mode. Press to execute the

change.