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HF Propagation


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70cm Projects - Directional Antennas

"Homebrew" 435MHz 12-turn Helix Antenna by VE2ZAZ
This 50-ohm impedance antenna, when fed with 25-100W of SSB RF at 435MHz, makes reaching Amateur satellites such as AO-40 and AO-10 a snap!

Click to enlarge10 El. "Homebrew" UHF Yagi for Satellites by SV1BSX
The design of my Homebrew 10 El. UHF Yagi is based on DL6UW Yagi antenna's design-formula. In my page you will find several details of manufacture, additional infos, construction details, Polar plots, Gain tables etc, from "YagiMax" Antenna-design program.

Click to enlarge10 Element for 432 MHz (Winkler Antennen) by DF9CY
For my return to 70cm Amateur Radio I have been looking around for a short light-weight yagi antenna, which could be rear mounted to the supporting mast. I came to Winkler Antennen who make and sell antennas for good price.

Click to enlarge10 element UHF antenna by ON6MU
The elements diameter of the antenna may vary between 5...8mm and the dipole diameter may vary between 8...12mm (12mm recommended) without the need of changing anything to the length or spacing.

11 Element for 432 MHz by DF9CY
This is a new own design for 2 * 11 element antennas for 432 MHz. It is derived from a design by Rainer Bertelsmeier DJ9BV (20 BVO). I cut it down to 11 elements and have a length of about 1.90m overall for the antenna.

2m/70cm Portable Tape Measure Beam by W6NBC
Work the OSCAR ham satellites orgo transmitter hunting with this inexpensive portable dual band handheld tape measure Yagi.

Click to enlarge6 element UHF Yagi antenna by VE3RGW
This is a standard 6 elements design scaled for UHF application. All material used in this project are easily obtainable tubes and rods which is limited within a total budget of $18.

6m/2m/70cm Yagi Antenna Built from Old TV Antenna by KGØZZ
This turned out to be a great little antenna. It works the 6 meter, 2 meter and 70 centimeter bands. You can use one common feedpoint or two seperate feedpoints depending on how you would like to connect this antenna to your transceiver.

Click to enlarge70cm band Gray Hoverman antenna by LY3LP
Material 4mm diameter. Feed it with 50 Ohm cable via 4:1 balun.

Click to enlarge70cm Moxon Beam by G3XBM
Do give 432MHz SSB a go sometime and if you think you have no suitable antenna then turn to your wife or girlfriend's wardrobe and search out an old coat hanger.

70cm UHF 6 Element Yagi Antenna by ON6MU
70cm UHF 6 element Yagi antenna.

Click to enlarge70cm-Longyagis in 28Ohm-DK7ZB-Design by DK7ZB
All Yagis in 28-Ohm-Technology, elements mounted with polyamid-clamps (Konni) or similar and 10, 8 or 6mm Diameter. Electrical details on the pages you see above, plots with "YO" from K6STI and "EZNEC +4" from W7EL.

Click to enlarge70cm-Short-Yagis for 430-440MHz by DK7ZB
Short Datas of the Yagis: 430-440MHz at SWR <1,8 (10 El. 430-438) , Boom 15x15mm or 20x20mm,
Radiator 10mm, Elements 8mm or 6mm.

Click to enlarge9 Element for 432 MHz (DK7ZB Type) by DF9CYhttp://www.df9cy.de/tech-mat/cy432-9/cy432-9.htm

Cheap Yagi Antennas for VHF/UHF by WA5VJB
These antennas are relatively small, easily constructed from common materials/tools and have surprising performance. The feed method is greatly simpified by directly soldering the coax to the driven element.

Corner reflector antenna by VE3RGW
This design is a periodic plane spaced behind a radiating dipole. The critical factors are the corner angle and the spacing between dipole/vertex ( fold point of reflector ).

Click to enlargeDouble "Lazy H" 435 MHz 10,8 dBd by LY3LP


Click to enlargeDual Band Tape Measure Yagi Antenna by KM4LGM
While I wait for my Arrow antenna to arrive, I thought I would experiment and build a dual band tape measure yagi since I already had most of the parts on hand.

Click to enlargeHand held dualbander antenna by LY3LP
RZ9CJ design, made by LY3LP.

Click to enlargeHB9RU/MTN-beam für VHF und UHF durch HB9MTN
Die 2 Meter-Version des HB9RU-Beams, ursprünglich nur für die Aufnahme der Richtdiagramme im Auftrag von HB9RU gebaut, zeigte so gute Resultate, dass spezielle Typen für VHF und UHF gebaut wurden.

Click to enlargeLazy H 2m 70cm dualband satellite antenna by LY3LP


Click to enlargeMoxon 2m ,70cm dualband antenna by LY3LP


Click to enlargeMy Arrow-Style VHF/UHF Portable Satellite Antenna by VE2ZAZ
One of the pleasure of working the amateur radio satellites is making contacts in a portable application and with QRP power. This requires a VHF/UHF handheld FM radio and a handheld 2-band antenna.

Click to enlargePortable UHF 4 elements Yagi Antenna by YO4HHP
Although I’m not a big fan of V/UHF, going over DK7ZB’s website I was impressed by his numerous Yagi antenna design and their good efficiency, and also, myself, eager to do some mechanical construction, I decided to try building this four elements Yagi for 430-440Mhz, to use it this summer in portable operation, mounting hiking etc.

Click to enlarge The $4.00 Ham Radio Satellite Antenna by KGØZZ
It's a dual band 2m/70 cm yagi antenna made with common materials and cost very little to make. Also, the antenna is fed with only one coaxial cable and does not use a duplexer.

The 440MHz Slingshot Antenna Project by N9YBP
I needed an antenna with some directivity that I could point east. I saw the Slingshot antenna project on the Hamuniverse website and wondered if it could be cut down to 440 Mhz from 2 Meters.

UHF 3-element portable antenna with gamma-match by ON6MU
UHF 3-element portable antenna with gamma-match.

UHF 70cm 4-element long Yagi by ON6MU
UHF 70cm 4-element long Yagi.

Click to enlargeVHF/UHF Wideband Portable Dipole by ON6MU
As everybody knows a dipole has about 3dB gain over a quartre wave antenna, is why my preference went to a simple dipole. To make it portable I used two identical telescopic antennas of 80 cm slid out and only 14 cm when pushed in.

Click to enlargeVHF/UHF X-Beam by KØEMT
I sat down and drew out what I did and thought I'd pass on what I did/found out. The design is from The 1993 ARRL handbook that was given to me by wd0hbx. The x-beam was originally intended as an HF mono-band beam. I used the formulas to build it for 6m. It also happens to work out really well for 2m & 70cm use as well.

Creation date : 19/08/2007 @ 22:36
Last update : 11/03/2019 @ 08:29
Category : 70cm Projects
Page read 83587 times

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