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The Inverted L Ham Antenna

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ANTENTOP- 01- 2018 # 022

The Inverted L Ham Antenna

 

 

 

Figure 2

Complete schematic diagram and parts list for the antenna matching unit

 

 

 

Photo 3

Photo showing the construction on the network, which is built on a plywood board

 

R1 and RFC were added to the circuit to bleed off any static charge which might develop during thunderstorms. The knife switch mounted on the utility pole is used to short the antenna and protect the station equipment when the station is not on the air during heavy electrical storms. This matching network has handled a 400- W transmitter for a year and shows no signs of heating or arcing of components.

 

Calibration

 

As mentioned earlier, it is not necessary for anyone who plans to duplicate this antenna to do any design work to assure a good impedance match.

It is necessary, thought, to have a SWR in the line while making the adjustments for low SWR on each band. Start your adjustments with the switches set on the 20- meter band. While watching the SWR indicator, rotate C1, until the lowest reading is indicated.

 

Small variables in the antenna installation may make it necessary to change the taps on the coils one or two turns. If this becomes necessary (it is if the SWR indicator cannot be made to read a low value) the C1 setting should be re- adjusted for a low reading after the taps are changed. When the SWR has been made as low as possible on 20- meters the procedure is repeated on 40 and 80 meters while adjusting C2 and C3 respectively.

 

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Last Updated:

January 2, 2020 21:24

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