For yagi’s the longer the yagi’s the better the gain until you reached the point of diminishing returns – the point in which adding additional directors no longer produced a substantial gain or improving the front-to-back ratio. So worry not this 7 elements yagi is not there yet. The yagi design here is simulated using 4Nec2 antenna modeler, the measurements may not be your typical yagi, but I want it that way ;).
Thank you for the people that keeps the site afloat by asking me to design antenna for them, thereby buying the end product and testing the end result. Shout out to Mr. Jonathan Mendoza thanks to your generosity.
Here’s a quick look to the antenna that I built for him, he sent me the picture and I asked him if I can post it on my antenna facebook page he obliged, not knowing that I will also post it here. Bro, thanks a lot for the support!
To those people following my facebook page, this website and sending me a private message asking for the measurements, as promised – though it took a while, the diagram is finally out. Similar build instructions and materials are used same as my previous antenna builds.
Material list for building a 7 Elements 2m VHF Yagi
1. 1″ X 0.5″ Rectangular Aluminum tubing for the boom
2. 3/8″ Aluminum tubing for antenna elements
3. 1cm Outside diameter antenna tubing for elements holder
4. 1pc SO239 connector
5. Pop rivets / Rivet tool
6. #12 AWG Copper wire with insulation (12″for Gamma match)
7. Soldering iron
8. 14pcs Stainless steel nuts and bolts 20mm length 3mm diameter
9. 1pc, Butterfly nut and 1 bolt 18mm length 3mm diameter
10. Aluminum plate 0.5mm thickness
11. Collapsible tube (shrinkable tubes)
Cut the materials according the the measurements here:
Download the PDF Document here
Antenna pattern simulation using 4 Nec 2
Horizontal pattern
Vertical pattern
Combined pattern / approximate gain / beam width
7 Elements yagi configured in vertical 2 stacked antenna tuning video (frequency response) using N1201SA antenna analyzer
The same antenna configuration frequency response and calibration is confirmed using NanoVNA antenna analyzer
So what gamma match to use on this build?
You can use the gamma match measurements that I used on 4 Elements Yagi build. You can follow this link to see the gamma match diagram: https://dw1zws.com/building-the-gamma-match-for-4-elements-yagi/
So that’s it, I hoping that it will help you somehow in building your own 7 elements yagi antenna. If you found this post interesting please consider subscribing on my youtube channel https://www.youtube.com/c/EphraimGariguez or follow me on my facebook page https://www.facebook.com/panda.antenna. Cheers and 73!
2 replies on “7 Elements Yagi for 146Mhz band build”
If our frequency is in 140.100 it is possible to adjust, and how much the cutting of elements..thank you.
Possible but you have to re-calculate, easiest way is find an antenna program that calculates a yagi antenna for your specific frequency. Sorry I don’t provide tutorial here on how to compute for specific length or adjustment, those can easily be found on the internet. Its your responsibility as a home brewer to discover it yourself and understand the details. I just share my work for reference to those interested in home brewing, but I don’t spoon fed, unless we are in a classroom setting.