2 meter quarter wave antenna


This is the first transceiving antenna I've ever built. It is perhaps the simplest 2 meter quarter wave design.
Element sizes are based on the formula:

length of elements in feet = 234 ÷ freq

Using 146 MHz as midway in the 2 meter band:

234 ÷ 146 = 1.6 ft

1.6 ft x 12 in/ft = 19.23" for main vertical element & for each ground radial

1/16" welding rod for elements

horizontal elements: rod ends curled with needlenose to allow fastening beneath machine screws:
rodcurl

vertical element soldered to SO-239:
solderrod

4 horizontal radials fastened with machine screws & lock washers:
4horiz

completed quarter wave 2 meter antenna located barely above patio, next to I-Max 2000 10 meter flag pole:
qtr+iMax

short PVC mast, painted, capped, siliconed:
close


RG-213 coax connects the tranceiver to the SO-239 on the antenna.
The SWR is 1.35:1 across 2 meters.

Although this design was not supposed to cover 70 cm, the resonance in that band is even better: 1.1:1

The BaoFeng UV5RA I use gets good signal & audio reports. This antenna allows me to reach several repeaters that I could not while using a 7" or 15" rubber duck indoors.

There is 8' additional PVC mast below the patio roof line, recessed in the corner post. In emergencies the antenna could easily be raised for better performance.


updated 6 April 2016   © 1932-2016 Derrick Garbell   All Rights Reserved    Radio page