|Subject:||[TowerTalk] matching to screwdriver antennas|
|From:||Dan Sawyer <email@example.com>|
|Date:||Wed, 02 Jun 2004 20:52:59 -0700|
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??
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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