HF radio transmission
Manpack Transceiver 2110 series Getting Started Guide 71
Summer HF radio communications usually operate on higher
frequencies than those used in winter over the same distance.
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 radio communications 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 HF radio communications (see page 29,
Selecting an appropriate tactical 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 9 shows examples of channels and the information
associated with them.
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