ANTENTOP- 01- 2017 # 021

Several Universal ATUs for the Whole Amateur

HF Band

Figure 4

Modified Universal ATU

Further improvement of the ATU was made for upper HF Bands 18- 32 MHz. L3 is an additional coupling coil that is added and only works in these ranges.

This coil increases the value of matching loads (as loads having only active resistance either having complex impedance with active and reactive component). The diagram for this ATU is shown in Figure 5.

Figure 5

Schematic of Universal ATU with Improved 18-32 MHz Band

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