NAVIGATION AND
COMMUNICATION
AIRPLANE
OPERATIONS
MANUAL
2-18-11
Page
8
Code
01
REVISION 33
HF OPERATION (only for KHF-1050)
The KHF-1050 High-Frequency Communications System operates in a
frequency range of 2.0 to 29.9999 MHz with resolution of 100 Hz, and
has different operating modes: Amplitude modulation (AM), upper
side-band voice (UV), lower side-band voice (UL), upper side-band
data (UD), lower side-band data (LD) and continuos wave (CW).
The AM, UV and UL operating modes may be used, and the UV
operating mode is highly recommended due to its quality and range.
The UD, LD and CW operating modes are inoperative and its use will
take no effect. Therefore, the UD, LD and CW modes should not be
selected.
Simplex Operation means that the transmission and reception
frequencies are the same, while Split (or Semi-duplex) Operation
means transmission (TX) and reception (RX) on different frequencies.
International Telecommunication Union (ITU) is a Split Operation, and
Emergency is a Simplex Operation, both with defined frequencies and
selected by a channel number.
NOTE: - The use of Lower Side-band is legal for some international
and off-shore communications, but is not authorized for use
in the United States and most European countries.
- Be sure all personnel are clear of the HF antenna when
performing radio checks. Serious RF burns can result from
direct contact with the antenna and its terminals when the
system is transmitting .
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