Comtech EF Data SNM-1002 - Manual (Page 50)

SNM-1002 LinkSync
 Modem
Revision 2
Operation MN/SNM1002.OM
3–10
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 Modulated 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.
3.4.1.1.8 MODULATOR:MODEM REFERENCE
MODEM REFERENCE
INTERNAL
Displays the following references to the modulator:
• INTERNAL
• EXT1, EXT5, EXT10, and EXT20 MHz
Note: If any EXT REF is selected for the modem reference and there is no input to CP3,
the modem will detect an alarm and switch to the INTERNAL clock.
Upon entry, the current modem reference is displayed with the flashing cursor on the first
character. Press [
↑ ] or [↓ ] change the modem reference. Press to execute the
change.