Even though the publication of the first works DL6WU yagi been more than 30 years, his approach yagi antenna
design is not to be ignored and rejected. We must remember that at the time when Gunter Hoch emerged his yagi design is not any variety of programs for yagi antenna, and computers were not so "strong." At the present time many authors make their own designs, which honestly told and do not give a revolution success!
DL6WU yagis is caused by a physical test on the training ground, in practice, in real terms, in the work and it was only later on the basis of their physical dimensions written program, which builds on a physical model, and the actual dish that represents a sufficient accuracy, wherein formula sufficiently accurate for this type of antenna.
It was a huge work at that time, and the author himself said that made all those diagrams and the results came up, should have been 50 000 times (?!) change the spacing and length of the elements!
Looking presented diagrams have to conclude, not without a certain bitterness,
If this is so, and everything points to the fact that it is, is not it high time to stop endless, fruitless "improvement" of existing Yagi antenna and a flood of "new" and "Best" construction Yagi antennas, which usually can not even catch up performance of existing "old" antenna, let alone to overcome them?
Here I will try to describe a few of my yagi antenna, which are built by DL6WU formula.
The advantage of this design is that it allows a deviation of a few millimeters in length element or elements to position the booms.
This program calculated Yagis for - 50,70,144,220,432,900 Mhz & up frequencies.
Only open this little DL6WU yagi Antenna calculator whose use is extremely simple. This YAGI DESIGN program for 50mhz & up based on the work of DL6WU. Also designsT-match,Dipoles, coax baluns & provides sources of materials.
Enter the basic information, choose the band that you want to make antenna, and then offered a menu calculations.Use the ENTER to go further up to your new Antenna and you can also print!
These are my yagis built by DL6WU formula,
First is 4el. 50MHz 3m. long yagi with non insulated elements mounted on the boom.An open dipole is adjusted using the gamma mach.There is a need of a little experimentation about the length and spacing GAMMA Mach to get a low SWR.After several attempts, it was resolved, so that the antenna worked perfectly.Yagi is completely made out of old TV antenna - boom is 18x18mm square, elements are 12mm pipe with added 10mm tube to getting the proper length for the 6m band - and that is why cost of making this Antenna is a low, very low.Normally, you can make a antenna made of material that's available to you, or that you buy in stores. I recommend 20x20mm square for boom and 12mm tube elements.With this tubes Antenna weight is small but still is resistant to wind and other natural disasters.
If you want it is possible to make a yagi for 70 MHz. in this or a similar way with this program. Personally, I did not, because at that time I was not on 4m. band, but I have no doubt that it will work great.
Next is 4el. for 144 Mhz .Length is only about 1m.For this antenna was used boom 18X13mm, the elements are 4mm Al. rods isolated through boom with plastic plugs .Dipol is made in the T-mach version with 1:4 balun (RG-58),because then I have not made a tool for bending dipoles.The good side of the T-Mach is that by moving the jumper gets low SWR.On the other hand, this dipole is complicated for make and is much susceptible to corrosion.Otherwise, I recommend that you always use a folded dipole whose construction explained on BVO Yagis for 1444Mhz pages. Antenna has no big gain, but her direction provides a better chance to hear and work weaker signals in the FM or SSB.With different types of GP, J-pole and vertical antenna that is much harder, and sometimes impossible.For a little time and $ you can create a good antenna for daily use or portable operation.
This Antenna is 3.8m. long,9el. also for 144MHz.Boom is Al. square tube 18x18mm and elements are 5mm. Al. rods.Dipole as in previous antenna made at T-mach version, and elements are isolated through the boom.Antenna has been used several times in the contest, ES sporadic opening and proved to be a lot better compared to the shorter version.However, this is antenna which are close to the length of 2WL and simply must have a gain.Antenna was used from 2006 to 2008 when she "retired".
This small antenna system was developed in order to get a higher gain,but the yagis not need be so long.It is a system 2X7el. and length of each antenna is about 3m.These two yagi also made from old TV antenna.Boom is 18X18mm and elements are 12mm tubes and whole performance is robust.DL6WU Yagi Antenna calculator is also used to make them and for optimum stacking distance.Director is folded dipole with 1:4 coax balun.The elements are not isolated through the boom Antenna system have been made in 1998s and have used for many years in various locations without any problem.System were initially used for FM mode in the horizontal stack.Later it was used in SSB mode of operation but in vertical stack.
2X7el vertical polarisation 2X7el horizontal polarisation
Home Made λ/4-power splitter is used for stacking.
A very good tool to construct power splitters is AppCad program.
Note - This formula only applies for yagis of more than about 10 elements, boom length greater than about 2 wavelengths!
DL6WU Optimal stacking in German
Next Antennas are for 432 MHz band.Like previous Antennas and these are calculated by the DL6WU program.
This is a system of 2x12el. yagis.
Boom was taken from old TV Antenna -18X13mm-, and the elements are 4mm Al. rods.The elements are isolated through the boom using plastic-home-made plugs.Driven element is classic folded dipole with a 1:4 coax balun.
For stacking usimg home made λ/4-power splitter ,
Power Splitter Gallery
And finally - DL6WU Yagi for 1296 MHz.This 26el. antenna is also built with this programa.Boom is 18X13mm and elements are 3.2mm Al. rods.The elements are isolated on the boom using of old PVC insulators of TV Antenna.
Dipol is a classical bent with 1:4 balun and N Conector.
When making this Antenna accuracy is very important, because the deviation of just one millimeter (1mm!) may lead to a shift operating frequency of a few MHz. !
To Be Continued-stay tuned . . .