Comtech EF Data SDM-650B Installation And Operation Manual page 115

SDM-650B Satellite Modem
CW_Mode
(Test Mode Configuration
Option)
Rev. 5
Programs the modem for continuous wave mode. Three modes of
operation are available:
•
Center
•
Dual
•
Offset
Center Mode:
Generates carrier at the current modulator frequency. This can be
used to measure the output frequency.
Dual Mode:
Generates a dual side-band suppressed carrier signal. Side-bands
are at one-half the symbol rate from the carrier. This is used to
check the channel balance and carrier null.
Offset Mode:
Generates a single upper side-band suppressed carrier signal. The
upper side-band is at one-quarter the symbol rate from the carrier.
This is used to check the quadrature.
On entry, the Center mode is displayed. To activate this test mode,
press [ENTER]. Use the arrow keys to select Dual or Offset mode. To
return to the Config menu, press [CLEAR].
Note: When [CLEAR] is pressed, the modem is configured to the state
it was in before CW_Mode was invoked. The transmitter is automatically
turned OFF to prevent the possible swamping of other channels. To
turn the transmitter ON, use the RF_Out function.
Operation
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