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[TowerTalk] matching to screwdriver antennas

Subject: [TowerTalk] matching to screwdriver antennas
From: Dan Sawyer <>
Date: Wed, 02 Jun 2004 20:52:59 -0700
List-post: <>

Screwdriver antennas present an interesting matching problem. When fully retracted, typically 10 meters, the antenna is close to a resonant vertical and has an impedance of about 35 Ohms. However when extended to 80 meters it has an impedance of about 1 Ohm radiation and say 5 Ohms coil. That is close to a 6:1 difference in the radiating element. For this let's assume a constant ground from 80 to 10 meters.

Is there any way to design a reasonable matching network for a screwdriver antenna??



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