Saturday, January 21, 2017

Simple Ham Radio Antennas--A Simple 40 Meter Vertical For Field Day. Post #1019.

A Simple 40 Meter Vertical for Field Day
(http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=32463).
Accessed on 21 January 2017, 23:45 hrs, UTC.
Please click link to read the full article.
Author:  Gary C. Sutcliffe (W9XT).

Comment:

The ARRL Summer Field Day is fast approaching (last full weekend in June) and now's the time to build that portable antenna for your "Field Day" experience.

In this article from Gary C. Sutcliffe (W9XT), we learn how to design, build, and use a simple 40 meter vertical antenna for your remote operation.  The antenna is simplicity itself, with a fiberglass mast, a tapped coil, 32.8 ft/10 meters of household wire, a ground stake, and two elevated counterpoise wires about 4-ft/1.21 meters above ground comprising the entire system.  The feed line is a convenient length of 50-ohm coaxial cable, with any excess cable being wound around a plastic coffee "can" to serve as an rf choke.  A great and effective design that will get you many late afternoon and evening contacts.

I've used a variation of this design to work 40-10 meters by replacing the coax with 450 ohm ladder line, 300 ohm tv twin lead, or homemade balanced line and feeding that line into a 4:1 current balun.  A short length of coax connects the balun/balanced line combination to my trusty Drake MN-4 "tuner." Like Gary, I've used elevated counterpoise wires to supply the missing "half" of the vertical antenna.  This design works very well on all amateur radio bands 7 MHz and above.

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http://www.HawaiiARRL.info.
https://oahuarrlnews.wordpress.com.
https://bigislandarrlnews.wordpress.com.
http://www.kh6jrm.info (breaking news for radio amateurs).
http://hawaiisciencedigest.com (latest science and technology news for radio amatuers).

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Thanks for joining us today!

Aloha es 73 de Russ (KH6JRM)