HF radio transmission
2110 SSB Transceiver Getting Started Guide 61
Solar activity varies over an 11 year cycle. Higher frequencies
need to be used during periods of peak activity.
It is important to remember that you may need to change the
frequency you are using to achieve the best communication.
The general rules of thumb for HF communication are:
• the higher the sun, the higher the frequency
• the further the distance, the higher the frequency
Antenna selection
The selection of an appropriate antenna is critical to the
success of your communications (see page 21, Selecting an
appropriate antenna).
Channels and modes
A channel is a name that is given to a frequency or a pair of
frequencies, e.g. ‘Channel 1’, ‘4500’ and ‘Headquarters’. The
frequencies may be any frequencies within the HF range.
Each channel has one or more modes associated with it. Each
mode indicates a sideband that can be used with the channel,
such as USB or LSB. When you make a call you need to
specify the channel and the mode you want to use.
Table 7 shows examples of channels and the information
associated with them.
Table 7: Examples of channels and modes
Channel Receive frequency
(kHz)
Transmit frequency
(kHz)
Modes
Channel 1 10600 10600 LSB, USB
4500 4500 – AM
Headquarters 22758 23000 USB
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