Wednesday, December 28, 2016

Simple Ham Radio Antennas--Adding 80 metres to a 40 metre dipole

If you're having trouble viewing this video, please insert this title link into your browser search box: This is post #995 in a continuing series called "Simple Ham Radio Antennas."

Now that propagation is favoring the lower HF Amateur Radio Bands (160-40 meters), it may be a good idea to redesign your 40 meter dipole antenna to accommodate the 80 meter (3.5 MHz) band.  If you live on a small urban lot, extending your 40 meter (7 MHz) dipole antenna may present some challenges.

In this video from Peter Parker (VK3YE), we learn how to use a 7 MHz dipole antenna on 3.5 MHz by adding end-loading coils.  Although this modification won't be as effective as a full-length 80 meter dipole and will be a bit narrower in bandwidth, it will get you on the air.  You may also use the 40 meter part of this modified antenna to work stations on the 15 meter (21 MHz) band, since the 40 meter elements will be usable as a 3/2 dipole on 15 meters.  An antenna transmatch (i.e. "tuner") will be helpful in keeping SWR to a low level.

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Aloha es 73 de Russ (KH6JRM).