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4m Projects - Antennas

½ λ antenna for 50MHz FM af OZ2M
Formålet med den denne side er at beskrive en ½ λ vertikal endepunktsfødet antenne til 70 MHz, baseret på et design til 50 MHz af DK7ZB, og hvordan du nemt kan efterbygge den.
http://www.rudius.net/oz2m/70mhz/vertical_dan.htm

4 m/6 m Vertical Dipole by PE1CUL
I have limited room for large antennas, that is why I made a dual band dipole for 6 and 4 meters.
https://pa0fri.home.xs4all.nl/Ant/4m,%206m%20dipool/4m,%206m%20dipool%20Eng%20version.htm

70Mhz (4 metre) Delta Loop by EI4DIB
Having just obtained an AKD 4001 and after the success of the 6 metre Delta Loop, which included working most of Europe in a day during a recent lift, I decided to have a go at one for 4 metres.
http://ei4dib.blogspot.com/2011/02/70mhz-4-metre-delta-loop-simple-antenna.html

70MHz Quarter Wave Ground Plane Antenna by MØUKD
The quarter wave is a good reliable antenna, and SWR is very robust and not affected by rain or snow etc. It can be built with very predictable results, even near trees or buildings, due to it’s low feed impedance.
https://m0ukd.com/homebrew/antennas/70mhz-quarter-wave-ground-plane-antenna/

A dipole for 70MHz (4m) by MØUKD
Today, I finally built a ½ λ dipole for 4m,using two 1 metre lengths of 6mm aluminium tube, and all terminations are inside a waterproof electrical box.
https://m0ukd.com/2014/09/half-wave-dipole-antenna-for-70mhz-4m/

A Moxon rectangle antenna for 4m by G6GVI
I've heard a couple of stations recently discussing using a Moxon rectangle antenna on 4m, but had to go looking in my books to discover what they were talking about.
http://ei4dib.blogspot.com/2015/11/a-moxon-rectangle-antenna-for-4m-by.html

A Super J-Pole Antenna for the 4m (70Mhz) Amateur band by EI4DIB
The Vortex ‘Super J-Pole’ Antenna consists of a five eighth wave vertical radiator, a half wave tuning section and a half wave top section. At the base, a quarter wave matching stub forms the classic ‘J Shape’.
http://ei4dib.blogspot.ie/2015/09/vortex-super-j-pole-antenna-vhf-70mhz.html

HB9CV for 4m by EI4DIB
A year or so ago I bought the HB9CV from Moonraker, The antenna was easy to put together, but the instructions are not very clear, you have to work out yourself how to fix the driven element. Inside the terminal box is an air spaced 'beehive trimmer' - not seen one of these for years!
http://ei4dib.blogspot.com/2013/03/hb9cv-for-4m.html

Omni-directional mixed polarisation antenna for 50MHz & 70MHz by G8JNJ
This is a simple 'Halo & Stub' antenna which provides an omni-directional radiation pattern with mixed polarisation, which I built for use with the SUWS WEB SDR.
https://web.archive.org/web/20230722120122/https://www.g8jnj.net/50mhzomniantenna.htm

The Phoenix 4m Dipole by G8OSN
This 4m dipole was designed as a club project for the Phoenix Radio Club to use with a bulk purchase of 4m converted "PMR" radios.
https://www.qsl.net/g8osn/contents/articles/4mdipole.htm

The triple (half wave) dipole for 4m by EI4DIB
I decided to experiment around with wire dipoles, but these do not have any gain. I measured the distance between the back wall and the house and I realised it was about three times the length of a dipole for 6m.
http://ei4dib.blogspot.com/2015/11/the-triple-half-wave-dipole-for-4m.html


Creation date : 10/11/2011 @ 23:39
Last update : 11/08/2024 @ 11:01
Category : 4m Projects
Page read 34075 times

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