NAVIGATION AND
COMMUNICATION
AIRPLANE
OPERATIONS
MANUAL
2-18-21
Page
2
Code
01
MARCH 30, 2001
SUPPRESSED CARRIER AND REDUCED CARRIER
The SSB operation with the carrier frequency eliminated is referred to
as single sideband suppressed carrier and is designated as the TEL
SUP CAR mode in the HF-230.
If a small portion of the carrier frequency is transmitted along with the
sideband, then the operation is referred to as single sideband reduced
carrier. and is designated as the TEL PLT CAR mode in the HF-230.
SIMPLEX AND HALF-DUPLEX OPERATION
Simplex operation means that the transmission and reception
frequencies are the same. An example of simplex operation would be
communications with a control tower using a VHF COMM transceiver.
Half-duplex means transmit on one frequency and reception on
another frequency. All 176 of the ITU channels provided the HF-230
are permanently programmed for half-duplex operation and will
normally be worked in the TEL SUP CAR mode. The 40 user
programmed channels can be programmed for either simplex or half-
duplex operation, and can operate in any of the available modes (AM,
USB, LSB, TEL SUP CAR, or TEL PLT CAR).
NOTE: The use of LSB is legal for some international and off-shore
communications, but is not authorized for use in the United
States and most European countries.
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