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4m Projects - Antennas

Click to enlarge"Hen-Tenna" for 4m by G4UNB
Having read about the "Hen-Tenna", an unusual rectangular antenna design for the high HF and low VHF bands, I wanted to try one of these on four metres.
http://www.70mhz.org/index.php?categoryid=6&p2_articleid=275

Klik voor vergroting70 MHz Yamag antenna by IKØSMG
After that I have realized the Yagi-Mag (feed slot magnetic) for the 2 m with good performance (you see iw0ffk site) I have constructed this for the 70 MHz. This is the result, simulation and real.
http://www.70mhz.org/index.php?categoryid=6&p2_articleid=276

Click to enlarge70Mhz (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

Click to enlarge70MHz Big Wheel by OE5MPL
Not drawn is the fixing point of the female N-connector and the center conductor on upper part of hub. We fixed the antenna with a 50 mm diameter aluminium pipe, which was welded onto the lower hub.
http://www.70mhz.org/index.php?categoryid=6&p2_articleid=265

Click to enlarge70MHz 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/

Click to enlargeA centre-fed "co-axial" dipole for 4m by G4CJZ
In contrast to the end-fed designs, which can be difficult to set up because of their narrow bandwidth, this alternative uses a low-impedance centre-feed, and hence offers a broader bandwidth.
http://www.70mhz.org/coaxdipole.htm

Click to enlargeA 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/

Klik voor vergrotingA 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://www.70mhz.org/moxon.htm

Click to enlargeA 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

Click to enlargeHB9CV 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

Click to enlargeThe 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

Click to enlargeVertical half-wave aerials for 4m by G6GVI
With the recent growth in activity of 4m FM, I have seen a number of requests for designs for vertical aerials for the band. This article describes three variants of a half-wave design which I have used successfully over the last few years.
http://www.70mhz.org/halfwav.htm


Creation date : 10/11/2011 @ 23:39
Last update : 06/09/2018 @ 19:16
Category : 4m Projects
Page read 15159 times


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