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 Smallest boom 3ele yagi for 10mtrs 
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Post Smallest boom 3ele yagi for 10mtrs
I’ve tried downloading modelling software but my pc crashes or freezes so could any one model a 3 ele for 28mhz for me? Just looking for dimensions as the boom can’t be any longer than 1500mm or 150cms however you want it.
Yes I know this is a very short boom! This fits my particular circumstances. Or maybe it’s just better in a 2 element?
Thanks
John


Sun Jun 14, 2020 8:18 am
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 Smallest boom 3ele yagi for 10mtrs 
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Post Re: Smallest boom 3ele yagi for 10mtrs
a quick search reveals Vortex doing a 10m 2ele yagi, boom is 1.3m, the 3ele is 3m boom, perhaps the best compromise would be a Moxon, theirs is 1.7m boom.

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Sun Jun 14, 2020 11:49 am
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 Smallest boom 3ele yagi for 10mtrs 
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Post Re: Smallest boom 3ele yagi for 10mtrs
you wont get a 3 element yagi with a small boom that size for 10m ,as bone head as said a 2 element Moxon would be your best bet and it would have a boom around 1.5m, a wire Moxon is fairly easy to build with 4 3m fishing poles a aluminium spreader and a bit of wire and weighs next to nothing.

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Sun Jun 14, 2020 3:33 pm
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 Smallest boom 3ele yagi for 10mtrs 
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Post Re: Smallest boom 3ele yagi for 10mtrs
What dimensions do you want modelled?
Or did you want it designed for you?

What frequency?
What height above ground?
What is most important, gain, FB ratio or band width(all won't be good with a short boom anyway)?
What matching system do you want to use?
What diameter tubing?

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Mon Jun 15, 2020 4:49 am
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 Smallest boom 3ele yagi for 10mtrs 
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Post Re: Smallest boom 3ele yagi for 10mtrs
This is what you may get for a 1.5m boom, 3 elements

You can get as good with two elements and a slightly shorter boom, but it will need a gamma match.


Attachment:
10m1.jpg
10m1.jpg [ 148 KiB | Viewed 819 times ]


Attachment:
10m2.jpg
10m2.jpg [ 77.01 KiB | Viewed 819 times ]

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Mon Jun 15, 2020 8:03 am
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 Smallest boom 3ele yagi for 10mtrs 
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Post Re: Smallest boom 3ele yagi for 10mtrs
bonehead wrote:
a quick search reveals Vortex doing a 10m 2ele yagi, boom is 1.3m, the 3ele is 3m boom, perhaps the best compromise would be a Moxon, theirs is 1.7m boom.


Seems he has used a Moxon before.

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Mon Jun 15, 2020 8:42 am
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 Smallest boom 3ele yagi for 10mtrs 
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Post Re: Smallest boom 3ele yagi for 10mtrs
Sangoma wrote:
bonehead wrote:
a quick search reveals Vortex doing a 10m 2ele yagi, boom is 1.3m, the 3ele is 3m boom, perhaps the best compromise would be a Moxon, theirs is 1.7m boom.


Seems he has used a Moxon before.
While PMing him I suggested possibly an HB9CV, but as I only normally play with long pieces of wire and magnetic loop antennas I could not supply any dimensions for one.

Also, I believe he is looking at a commercial beam with the intension of modifying it. But I'll leave him to tell you that story, I don't like stealing other folks thunder! :D

73, Mark...


Mon Jun 15, 2020 8:51 am
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 Smallest boom 3ele yagi for 10mtrs 
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Post Re: Smallest boom 3ele yagi for 10mtrs
G0KZZ wrote:
Sangoma wrote:
bonehead wrote:
a quick search reveals Vortex doing a 10m 2ele yagi, boom is 1.3m, the 3ele is 3m boom, perhaps the best compromise would be a Moxon, theirs is 1.7m boom.


Seems he has used a Moxon before.
While PMing him I suggested possibly an HB9CV, but as I only normally play with long pieces of wire and magnetic loop antennas I could not supply any dimensions for one.

Also, I believe he is looking at a commercial beam with the intension of modifying it. But I'll leave him to tell you that story, I don't like stealing other folks thunder! :D

73, Mark...


Fair enough, my modelling won't be of any help.
I didn't get the idea he wanted a commercial one. from the first post, so I've gone of the track :)

I thought of the ZL special, but it is not as easy to construct as a direct feed yagi, and more pieces in the construction adds up to more places to corrode or loosen. They are great for a small 2m beam.

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Mon Jun 15, 2020 9:24 am
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 Smallest boom 3ele yagi for 10mtrs 
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Post Re: Smallest boom 3ele yagi for 10mtrs
Sangoma wrote:
Fair enough, my modelling won't be of any help.
I didn't get the idea he wanted a commercial one. from the first post, so I've gone of the track :)

I thought of the ZL special, but it is not as easy to construct as a direct feed yagi, and more pieces in the construction adds up to more places to corrode or loosen. They are great for a small 2m beam.

To be honest I think he may still be looking at all options so don't give up yet! :D

I did wonder about some kind of end fire array myself, but I kind of thought that maybe once you add a reflector, or director, or maybe even both, the constraints on the boom length he requires might not have made it feasible. Like I said above, I'm a long wire and loop man! :)

The last time I fiddled with beams was 30yrs or more ago, and I can't remember what I did yesterday half the time! :lol:

73, Mark...


Mon Jun 15, 2020 10:05 am
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 Smallest boom 3ele yagi for 10mtrs 
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Post Re: Smallest boom 3ele yagi for 10mtrs
If you are not sorted out for a 3 element yagi this might be of interest to you I know it's for 11m but could be tuned for 10m https://www.antennas27.com/27y3s-smartech

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Fri Jun 19, 2020 3:24 pm
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 Smallest boom 3ele yagi for 10mtrs 
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Post Re: Smallest boom 3ele yagi for 10mtrs
skyline wrote:
If you are not sorted out for a 3 element yagi this might be of interest to you I know it's for 11m but could be tuned for 10m https://www.antennas27.com/27y3s-smartech


Intersting link but prices are quite expensive.


Sat Jun 20, 2020 12:46 pm
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 Smallest boom 3ele yagi for 10mtrs 
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Post Re: Smallest boom 3ele yagi for 10mtrs
The 3el is reasonable, but as with all others once you go 4el or more they are smoking crack when it comes to prices, 100 quids worth of ALI and they are looking 400 quid plus for it,

I'd understand if it was a large VHF/UHF antenna that has lots of hardware but a 4 or 5 element yagi for 10m doesn't have 30 quids worth of hardware on it,


G6PRB wrote:
skyline wrote:
If you are not sorted out for a 3 element yagi this might be of interest to you I know it's for 11m but could be tuned for 10m https://www.antennas27.com/27y3s-smartech


Intersting link but prices are quite expensive.

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Sat Jun 20, 2020 2:01 pm
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 Smallest boom 3ele yagi for 10mtrs 
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Post Re: Smallest boom 3ele yagi for 10mtrs
ei2glb wrote:
The 3el is reasonable, but as with all others once you go 4el or more they are smoking crack when it comes to prices,


You can do worse than buy a Sirio SY-4 and shorten it slightly for 10m
https://www.nevadaradio.co.uk/product/sirio-sy-27-4/

That's what I did and worked the world on 10m in the last solar max, including winning my section of the ARRL 10m contest. Yes it's built to a price but it's not bad and mine was up for 3 or 4 years (now stored away until next solar max).


Mon Jun 22, 2020 7:27 am
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 Smallest boom 3ele yagi for 10mtrs 
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Post Re: Smallest boom 3ele yagi for 10mtrs
G0HVQ wrote:
ei2glb wrote:
The 3el is reasonable, but as with all others once you go 4el or more they are smoking crack when it comes to prices,


You can do worse than buy a Sirio SY-4 and shorten it slightly for 10m
https://www.nevadaradio.co.uk/product/sirio-sy-27-4/

That's what I did and worked the world on 10m in the last solar max, including winning my section of the ARRL 10m contest. Yes it's built to a price but it's not bad and mine was up for 3 or 4 years (now stored away until next solar max).


That is nearlt three time the length he needed :)

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Mon Jun 22, 2020 7:57 am
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 Smallest boom 3ele yagi for 10mtrs 
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Post Re: Smallest boom 3ele yagi for 10mtrs
I have a sy-4 never used it that much most dig it out been using an antron99 on 10 this year and it works well

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Mon Jun 22, 2020 8:11 am
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