Antenna basics and construction
The HF antenna can be considered as the essential link between free space and the transmitter or receiver. Therefore, the HF antenna's role is two-fold:
* To ensure that as much of the accessible RF power as possible supplied by the transmitter is radiated as an RF signal
* To ensure that as much of the received RF signal as possible is made accessible as RF power for the receiver to function successfully.
Consequently, the HF antenna is one of the primary factors that determines the characteristics and effectiveness of the complete system. Therefore, the design of the antenna within its working environment is vital to the overall success of a radio system.
This chapter addresses the practical construction of HF antennas and Antenna Tuning Units (ATU). The scale and range of HF antennas is extensive and so this chapter is confined to the description and construction of the more commonly used antennas.
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