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Antentop is FREE e-magazine devoted to Antennas and Amateur Radio an

Special page devoted to

VHF ATU

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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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Last Updated:

December 17, 2017 13:42

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