Saturday, February 17, 2018

HF Field Ops Gear-up. Dipole Antenna Tuning. Post #1406.


If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=cgdP8ao71Cc. You should also get the author's script and a list of NVIS technical references.

This exceptionally well-done video from "GUERRILLACOMM" shows you how to design, build, tune, and operate a NVIS (Near Vertical Incident Skyway) antenna for portable or emergency use.

According to the author, this low-lying NVIS dipole antenna is designed for 7 MHz (40 meter amateur radio band) and will cover local, state, and regional areas near your home.  It's always a good practice to test your portable antennas before you go to the field so you can make adjustments without stress or strain.

Reaction to the video has been favorable, with suggestions ranging from wire trimming to best height above ground for efficient operations.

Carl (N6CKV) suggests "Rather than cutting the wire to tune your antenna, try to fold the excess length back onto the antenna so if you make it too short you can easily lengthen it..."

And long time QRP enthusiast, Julian (OH8STN), recommends the height of the 40 meter NVIS antenna to be around 10-13 feet (3.04-3.96 meters) above ground.

NVIS antennas are well-suited for local and regional communications.  You can get more information on this type of antenna by "googling" NVIS Antennas.

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Views expressed in this blog are those of the reporters and correspondents.

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM).