Hi does anyone have ideas sizes for a H frame for 4-5 el yagies for 10 m and 15m ? is it 1/2 wl , 3/4 wl or 1 wl spacing ?? I saw one from http://www.arraysolutions.com/Users/h2a.jpg Arraysollution f
Why would anyone want to do this, instead of the conventional wisdom of vertical stacking and/or using longer Yagi's? Rick N6RK _______________________________________________ _______________________
I have a lot of aluminium tubes which fits for short boom yagi for 10 and 15. Long boom is not good with heavy snow and icing in norway. Why would anyone want to do this, instead of the conventional
Many contest and VHF stations do that. Long boom yagis need a lot of turning radius and spacing. I am going to built one for 10m if the band improves. 5/8 wave length stacking distance is imho the mi
Each yagi design has an optimum stacking distance. There is no universal rule for stacking if you want the best performance. Short boom yagis have lower gain and closer stacking distance. Long boom y
I would guess that with an "H" frame array you would get the increased gain of four yagis with less required turning radius, broader vertical beamwidth, narrower horizontal beamwidth and possibly a s
Your best bet if possible is to model the antennas and look at the gain compared to one antenna and the patterns. The wider the horizontal spacing the bigger your first side lobes. That may not be a
THANKS FOR NICE MODELLING! Your best bet if possible is to model the antennas and look at the gain compared to one antenna and the patterns. The wider the horizontal spacing the bigger your first sid
But.... When modeling a vertical stack, it is important to include the ground in your model. Free-space modeling does not take advantage of ground reflection. X/2X/3X spacing is a standard (where X i
The advantage of an H-Frame ranges from somewhat less than 5 dB for systems with less than optimum spacing to slightly more than 6 dB with maximum gain spacing. Without doing the modeling, one can l
The azimuth pattern will be much the same over ground. If you vertically stack antennas very close together you can see interaction between the antennas that can degrade the azimuth pattern. Although
My modelling for the planned 4x104CA stack is done by EZNEC and HFTA. I did not write that the vertical stack of 4 yagis cannot provide a desired 10° vertical lobe. Of course it can by proper combina
Just take into account that VE7BQH's fine antenna array information is a maximum gain design for EME. The first side lobes in the azimuth are only down around 12 db from the main lobe in many of thos
VE7BQH's information also uses free space designs since EME generally involves elevation above the horizon. Some can argue that HF use is better served by a more narrow but taller array which would c
I use greater spacing than has been described in this thread. (30' for 24' boom 5el 6m antennas and 50' for 7el 48' boom 10m antennas) The forward gain is higher. Why should I worry about the side lo
Well if you like the big side lobes as they give you more coverage in contests why did you cut the beam width of your main lobe in half by using an H-Frame?? <rhetorical question> 73, Jay K0GU ______
I do not use an H frame, I was just talking about the spacing. If I had an H frame, I would use closer spacing to cut down on the construction problems. I should have clarified this. Chuck W5PR _____
Thank you all guys for sharing thoughts and ideas with this subject. Will start with 4 over 4 on 10m first... then we will see what we can do on 15m and in future on 10m. 73s and see yaa in contest L