Comtech EF Data SDM-2020 - Manual (Page 54)

SDM-2020 Satellite Modulator Revision 7
Front Panel Operation MN/SDM2020M.IOM
5-12
5.6.1.7 CONFIGURATION:MODULATOR:CARRIER MODE
CARRIER MODE
NORMAL-MODULATED
Use this menu to program the modulator for continuous wave mode. Four modes of
operation are available:
NORMAL-
MODULATED Normal modulated data. The Carrier Mode is in the OFF position for
data modulation.
DUAL-CW Mode A test mode that generates a dual side-band suppressed carrier signal.
Side-bands are one-half the symbol rate from the carrier. This is used to
check the channel balance and carrier null.
OFFSET-CW
Mode A test mode that generates a single upper side-band suppressed carrier
signal. The upper side-band is one-quarter the symbol rate from the
carrier. This is used to check the quadrature.
CENTER-CW
Mode A test mode that generates a carrier at the current modulator frequency.
This can be used to measure the output frequency.
1 Press while in the NORMAL-MODULATED mode to turn OFF the TX-IF Output.
2 Press a second time to turn ON the TX-IF OUTPUT.