Comtech EF Data SDM-650B User Manual
Page 280
Asynchronous Overhead Channel Unit
SDM-650B Satellite Modem
F–22
Rev.
5
CW_Mode
(Test Mode Configuration
Option)
Programs the modem for continuous wave mode.
Three modes of operation are available:
• Center
• Dual
• Offset
Center Mode:
Generates a 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 the Dual or Offset modes. Press
[CLEAR] to return to the Config menu.
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. Use the
RF_Out function to turn the transmitter ON.