Tag: Aerial

QST Announces 2017 Antenna Design Competition Winners

QST has announced the winners of its 2017 Antenna Design Competition. Following a solicitation for entries earlier this year. members submitted nearly 100 antenna designs in three categories: 160 Meters and Lower Frequencies, 80 Through 10 Meters, and 6 Meters and Higher Frequencies.

Winners will receive certificates and cash prizes. The winning designs are also eligible for publication in QST a…

For the full article, http://www.arrl.org/news/view/qst-announces-2017-antenna-design-competition-winners

Original Article

Open Wire Line

I have been using balanced line for years to feed various antenna configurations here at the station. Originally, with lighter power handling requirements, I used the 450 Ohm #14 “window line” which sort of works but at a tremendous cost due to the marginal dielectric and its cross section to conductor ratio. That resulted in tremendous swings in matching because of rain, whipping around in the wind, and even heating in the sun.

I started to construct and experiment with the…

Original Article

The Bouvet Island 160m Vertical

Tim Duffy, K3LR, reports: The DX Engineering and Bouvet Island teams have worked together to design an efficient 90 foot top loaded 160 meter vertical antenna that can be installed quickly and safely on Bouvet Island by the 3Y0Z team this January

Original Article

MFJ-1982 and counterpoise or ground

I searched, but could not find anything on this, and the MFJ manual on this is sketchy. I was planning to get an MFJ 1982 which is an end fed half wave antenna at 80 meters, and functions as multiple half waves and shorter wavelengths. It claims to cover 40, 20 and 10 meters within 3:1 SWR, so should make the transmitter happy:)

Question, how long a counter poise should I have to prevent common mode currents on the coax? I have read several things, all sounding very wise and…

Original Article

How to set SWR on a dual band UHF/VHF antenna

This is a fairly inexpensive dual band antenna. The SWR checks reasonable on 2M, but on 440mHz, it is between 1.6:1 and 1.9:1, and the lowest SWR is at 450mHz. There is an internal adjustment with a setscrew at the bottom of the whip. Would this affect both bands? I would like to get a little lower SWR on 440 without compromising performance on 2M.

For the full article, https://forums.qrz.com/index.php?threads/how-to-set-swr-on-a-dual-band-uhf-vhf-antenna.576076/

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