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Syllabus Sections:-

7d Antenna Tuning Units

7d.1 Recall that balanced antenna systems tend to cause fewer EMC problems than unbalanced antennas.

Recall that the feeder (balanced or unbalanced) should fall away from the antenna at right-angles to minimise coupling.

This part of the syllabus is to highlight the fact that the balanced nature of the dipole tends to minimise feeder radiation when fed with balanced feeder but it is important to note that the feeder MUST leave the antenna at right angles to the orientation of the antenna.

Usually the dipole will be supported on two poles or masts one at each end and the feeder will then drop away to the ground.

When using the dipole your aim is to maintain as far as possible the balanced nature of the antenna and its feeder.

This sort of antenna arrangement then tends to cause least EMC problems.

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