All about Vertical Antennas by William I. Orr, Stuart D. Cowan

By William I. Orr, Stuart D. Cowan

This authoritative guide covers the layout, development, set up, and operation of fifty two vertical antennas.

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You may have to install the amplifier in your receiver. Otherwise, installing it in a metal case will reduce stray-signal pickup. You'll have to provide appropriate connectors on the case. Connect the amplifier to the antenna and radio using short lengths of coax. The circuit has only one adjustment. 6-volt drop across R2. If you're not sure of the impedance of your antenna, connect a 500-ohm potentiometer for R1, and adjust it for best reception. Then substitute a fixed-value resistor for the potentiometer.

Click here for the PCB. ERROR FIX: After several messages both in the message forum and personal emails about 'the tester is not working' I had another look at this page. Turns out, schematic diagram is correct but both the pcb and component layout where shown up-side-down. This would only affect those of you making their own pcb. Everything else is unchanged. Also, PCB diagram is now modified to print full-scale. I fully support this project. Most parts can be obtained via your local Radio Shack or Tandy store.

We even have to cut the solder leads as short as possible. C10 is soldered directly on to the '+' and '-' output jacks. C9 is soldered parallel over the L1/C10/L2 network. The two thick wires coming from the printed circuit board are soldered onto each leg of C9. Oh yeah, I mention again that the PCB has to be mounted isolated from the case. The common ground connection is connected to the '-' jack via L2. This is a little bit of tinkering but can be done. We are working here with 10 amps so worth all the efforts.

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