Homebrew 70cm 432MHz antennas for amateur ham radio

 

This is a list of designs for any type of 70cm 432MHz homebrew amateur antenna

To refine your search to show only vertical, loop, wire, portable, multiband etc. click refine search for homebrew antennas




Showing matches 1 to 10 of 12

Easy dual band VF UHF vertical

A vertical dual-band antenna for 144 and 430 MHz made with a TV twin lead and coaxial cable.
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Cheap Yagi Antennas for VHF/UHF

These antennas are relatively small, easily constructed from common materials/tools and have surprising performance.
The feed method is greatly simplified by directly soldering the coax to the driven element. No baluns or gamma matches
are used in this design. This simplified feed uses the structure of the antenna itself for impedance matching.
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Coaxial Colinear

You can build a colinear from coax by following this design. You will need to scale it to suit the frequency you wish to use.
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VHF / UHF Direct Connect Beams

Sizing
details for several 2 to 4 element beams from 10m to 70cm
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144 430 Mhz portable antenna

Design for a portable J pole
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EI7BA Multiband Cubical Quad

It covers six bands 20m to 10m on HF and also 6m. It is a Boomless (spider quad gem quad) design. It uses Glassfibre arms (a must). It uses a single coax line to a homebrew antenna switch. From there a seperate feedline goes to each of the Driven Element feedpoints. There is a homebrew Choke Balun at each feedpoint.

Performance
I have no accurate method to measure forward gain but I reckon it is the text book 6 to 7 db. F/B ratio is consistently 5 to 6 S points on my TS850 S meter on all bands 20 - 10m. I don't know how many dBs per S Point for my TS 850 but it is surely at least 3dB per S Point. So this translates to a minimum of 15 dB and arguably as high as 30dB. As wi
th all 2 element Quads It has a wide beamwidth about 60 degrees.

ADDENDUM.. An extra two bands..!
I have added three elements for 6m and 2 elements for the European 4m (70mHz) band to the existing spider, and on a seperate 6ft boom which is clamped to the spider, I have 5 elements for 2m, and 9 elements for 70cms.. A grand total of 11 bands..
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4 6 and 10 element Yagis for 70cm

Yagis for 70cm. Simple straight dipole with bazooka balun. Optimised for forward gain.
10 ele 11.8dB forward gain 22dB front to back ratio.
6 ele 9dB forward gain 13dB front to back ratio.
4 ele 7.6dB forward gain 14dB front to back ratio.
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70 cm Quagi

A pair of 8-element quagi's, set up for RHCP. Construction is simple, with no critical tuning. Made from 1/2" PVC pipe
and #10 wire for directors and #12 wire for loops.
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Home Brew dual band mobile antenna

This antenna is just a 1/4 wavelength resonator for both UHF and VHF band. It provides no GAIN as com
pared to other multi-section design. Yet it has the advantage of better stability against surrounding influence (e.g. different mounting method, unexpected reflection by surrounding objects, difference in stray capacitance between test bench and operating field ). The antenna consists of two sections. The lower section is a conductor cut to resonant on UHF band. The upper section is a coil which serves two purposes. For UHF band, this coil is a RFC (radio frequency choke). It blocks UHF frequency energy to flow through upper section. For VHF band, this coil enhances the inductance provided by lower section. The resultant inductor, together with surrounding stray capacitance will form a VHF resonant circuit and becomes the VHF antenna.
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Copper Cactus Dual-Band Super J-Pole Antenna Project

This home made j-pole is easy to build and sturdy. I have had very good results working with copper J-Poles, so I built my refined version of the classic J-Pole. I then ad
ded a short insulated section, the extra half wave of vertical length, and the needed half-wave matching stub.
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