HF-90 Operation & Installation Guide
Factors which affect HF/SSB communications
7
Section 2.3
As a rule, the higher the sun is, the smaller the distance
covered - for a particular frequency. This means that you can
use a low frequency to communicate during times when the
sun is low in the sky (early morning, late afternoon and
evening), but you will need to use a higher frequency to
cover the same distance during times when the sun is high in
the sky (midday). You will need to observe the above rule
carefully if your radio has a limited number of frequencies
programmed into it, as you may only be able to communicate
effectively at certain times of the day.
There are a number of different factors which will affect the
success of your communications via HF/SSB radio. These
are outlined below:-
Your choice of frequency
Generally speaking the higher the frequency you select, the
longer the distance covered. Frequency selection is perhaps
the most important factor which will impact on the success
of your HF/SSB communications.
Correct frequency selection is made easier with the use of a
Beacon facility (refer to Section 6.3 of this Guide for details
on the HF-90 Beacon).
Time of day
Season
The above rule (the higher the sun is, the smaller the
distance covered - for a particular frequency) also applies to
the season, or month of the year. Generally speaking, you
will need to use a higher frequency to communicate
effectively during Summer months, than you would need to
in Winter.
To Next Page
Loading...
General