Comtech EF Data C5 - Manual (Page 137)

C5/K1/K3 Integrated Satellite Terminal System Operation
Rev. 0 4–11
CARRIER MODE
(Test Mode Configuration)
Programs the modem for continuous wave mode. Four modes of
operation are available:
! NORMAL-MODULATED: The Carrier mode is normally
in the off position. To execute any of the Carrier continuous
wave modes, enter the Carrier mode and select the test mode
of choice.
! CENTER-CW: Generates a carrier at the current modulator
frequency. This can be used to measure the output frequency.
! 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.
! 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. This is used to
check the quadrature. When inverted spectrum is selected, this
generates a single, lower, side-band-suppressed carrier.
Upon entry, the Center mode is displayed. To activate this test mode,
press [ENTER]. Press [
$] or [%] to select the desired mode.
To return to the Configuration menu, press [CLEAR].
Note: When [CLEAR] is pressed, the modem is configured to the state
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 IF Output function.
RS ENCODER Programs the Reed-Solomon encoder on or off.
Upon entry, the status of the Reed-Solomon encoder is displayed.
Press [
$] or [%] to make the selection. Press [ENTER] to execute the
change.
Note: Programming the Reed-Solomon encoder automatically turns
off the RF transmitter (because of symbol rate changes). If none of the
proper overhead types and data rates apply, the Reed-Solomon
encoder program in the on state will be rejected (double beep).