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Do It Yourself - You're cheap, admit it. Now go discuss how to do it yourself with others

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Old 11-11-2016, 9:41 PM
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Default Cheap and easy portable 2-meter Yagi

This Yagi is made from 1/2" copper and PVC pipe. It dismantles for transport and takes about a minute to assemble in the field.
It uses a beta match and gets a 1.5:1 VSWR at the band limits, with about 1.3:1 at 146 MHz.
The H/T belt clip is connected to the boom with a hose clamp.
I already had the copper pipe and connectors. The PVC pipe and fittings cost less than $10 with enough pipe left over to make more.
Originally, I planned to reinforce the boom with a 5/8" oak dowel, but it seems to be rigid enough without.
I took it for a hike today on a hilltop and got great results.
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Old 11-11-2016, 11:30 PM
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Looks very nice and simple, but perhaps a bit awkward to use...
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Old 11-12-2016, 5:58 PM
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I built one of these years ago out of all thread worked pretty good,by the way the antenna looks good....
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Old 11-12-2016, 8:14 PM
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N4GIX,
Awkward, yes, it is somewhat. I'm already thinking about mods. Two things come to mind:
1) Finding a longer TX line; and,
2) Adding a tee at the balance point on the boom to accommodate a short mast pipe, then attaching a metal spike at the bottom of the mast. That way, when I'm hill-topping, I can stick it in the ground and save my arm.
Thanks, all, and 73s.
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Old 11-16-2016, 3:36 PM
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Default Rev. 1

Here's the Yagi with a tee added to the boom and a 3-foot mast.
The drivers have been trimmed for better tuning and the match has been tweaked to get the VSWR down.
I'm still looking for some 50-Ohm cable to improve the TX line setup.
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Old 01-21-2018, 8:47 AM
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Default Diagram and Data for Cheap and easy portable 2-meter Yagi

Hi kiloechozero

Very interesting this small antenna, but not much info other than pictures.

Do you have a detailed plan with mesurement to build this antenna? Specially the improved one (last picture with 3' mast)

also Specification for the Beta Match

73

Daniel VA2DG
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Old 01-22-2018, 11:41 AM
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Daniel,
Please see the attachment.

Off topic, if you are interested in VHF/UHF DX and hill topping, I came across a wonderful spot at Mount Adstock, near Thetford Mines. I was hitting repeaters over 250 miles away in New England with an HT and this yagi.
https://www.google.com/maps/place/46...!4d-71.2058643

73
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Old 01-23-2018, 2:24 PM
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Is it possible to add more directors for more gain.....
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Old 01-23-2018, 7:08 PM
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Yes, you can add more directors as long as you follow the percentage rules. I am not at home at the moment to look up the numbers, so it will be tomorrow.
Some one may chime in and have those numbers handy.
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Old 01-23-2018, 10:13 PM
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KB5ZCS,
See K7MEM's calculator here ... Martin E. Meserve - K7MEM - VHF/UHF Yagi Antenna Quick Designer
I used the DL6WU spacing.
If you use a cross for the director fitting, then you can easily add an extension for the boom. At one point I added a second director, but noticed that the boom has to be reinforced as it becomes floppy. Also, the balance point for the mast has to be changed. A more rigid mast might also help if you are going beyond 3 elements.
Good luck and 73
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Old 01-23-2018, 10:42 PM
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I don't think there is anything cheap or portable about a copper pipe Yagi. There are lots of plans for one made from old tape measure or nearly free new ones from Harbor Freight. The Yagi will be about the same size as the OPs but the elements will fold down so the antenna is only the size of the boom and it will be a lot lighter weight.
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Old 02-09-2018, 1:24 AM
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Quote:
Originally Posted by kiloechozero View Post
This Yagi is made from 1/2" copper and PVC pipe. It dismantles for transport and takes about a minute to assemble in the field.
It uses a beta match and gets a 1.5:1 VSWR at the band limits, with about 1.3:1 at 146 MHz.
The H/T belt clip is connected to the boom with a hose clamp.
I already had the copper pipe and connectors. The PVC pipe and fittings cost less than $10 with enough pipe left over to make more.
Originally, I planned to reinforce the boom with a 5/8" oak dowel, but it seems to be rigid enough without.
I took it for a hike today on a hilltop and got great results.
maybe awkward to hike with but it probably works great
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Old 04-08-2018, 7:16 PM
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Thinking back to when I was in the Army and came across a portable yagi utilizing telescopic whips. This was for a tactical low band DF unit someone brought into the C&E shop. Would like to make several, one for 6 and the other 2 meters.

Just gotta sit down and do the design work. Would be sharp getting one on 440.
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Old 08-16-2018, 4:41 AM
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I know nothing about antenna's, what frequency would this work with? I use my radio for only railfanning. Would something like this work if setup at a location where you plan to just sit for hours?
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