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11m: 1/4 wave groundplane base antenna build
Topic Started: Thursday, 27. September 2012, 18:39 (3,325 Views)
Nik Gnashers
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26 Charlie Tango 573

Early days of the build, but I am making a quarter wave groundplane antenna for my home qth. This will replace the sirio sd27 dipole I have up, which I cannot swr down below 2.1. The sd27 works ok, but as ever, I like to experiment and try home-brew twigs, so fingers crossed this will out perform the vertically mounted dipole.
Ingredients :
1) approx 20 feet of solid core copper mains electrical cable (free left by electrician at work).
2) the bracket for the sd27 dipole, which mounts it to a vertical mast (free thanks to a good friend).
3) a telescopic glass fibre fishing rod (free donated at work some of the eyes were broken).
4) a dipole centre with so239 socket (5.95 from knights).

Took the metal eyes off the fishing pole, stripped the outer plastic insulator from the mains cable and cut FOUR lengths of 103" each.
Mounted the dipole centre to the sirio bracket.

The intention is to run the upper 1/4 wave wire element up the inside of the fishing rod, and secure it at the top with something yet to be decided, and connect the other end to the dipole centre. Then connect the three groundplane wires to the other connection on the dipole centre and suspend these out at 45 degrees similar to a skylab / thunderpole II & III / Starduster.

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Cozzmik
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26 Charlie Tango 465

Nice one Nik..

Looking forward to seeing it progress :thumb:
Edited by Cozzmik, Thursday, 27. September 2012, 18:52.
Paws for thought
The more idiots i meet the more i like my dog :dog:


Roses are red.
Violets are blue.
When I listen to AC/DC,
My neighbours do, too
.







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HomerBB
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2 Charlie Tango 004

It's looking like a great start!!

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2CT004/2WR183
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Nik Gnashers
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26 Charlie Tango 573

Last night, I thought about the U-Clamps holding the fishing pole, and realised that when tightened, they might crush the pole itself.
So, today I salvaged a couple of old dumbbell plastic handles, to fit around the outside of the pole, and tried to find some plastic hollow pipe with a 25mm outer diameter to slide inside.
Looked all over, nothing would fit, so I had to BUY something (boooo grrrrrr etc). In the end, the cheapest thing was a 'bottom entry overflow connector' from wickes (sounds painful !). This brings my build costs spiralling up, it was 2.45.
So added to the 5.95 for the dipole centre, its standing me at 8.40 so far.
Anyhow, after chopping the screw threads off the ends, and inserting it into the pole, adding the dumbbell handles, its very very strong, and I can tighten up the U-Clamps and have faith that it will not start to crack in the wind :thumb:

Posted Image

EDIT : I like the way you have suspended the ends of your wire groundplanes Charles !
Very clever indeed ......
Edited by Nik Gnashers, Friday, 28. September 2012, 15:55.
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Nik Gnashers
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26 Charlie Tango 573

Today I managed to finish and erect the antenna.
I connected the groundplane wires and tested it, by bolting it to a wheelie bin handle, trimmed about 2" off the main element (so the finished length is approx 101").
I didnt trim the groundplane wires, they are 103". My SWR readings were 1.1:1 on ch1 ukFM, and 1.1:3 on ch40 ukFM.
Put the supporting pole on, by drilling through it, and bolting it to the wall bracket, to stop it twisting in the wind.

Posted Image

Next up, I secured the top of the main vertical element wire (which pokes out the end of the fishing rod) with a block connector to stop it falling inside the rod, and amalagated the top to stop water getting in. The rod sections are also amalgamated.
I mounted the antenna onto the pole, tightened everything up and it seems very secure.
I checked SWR, and as expected, it rose slightly, it reading 1.1:4 on ch1 ukFM, and 1.1:6 on ch40 ukFM. I knew it would be higher because the shed roof which is directly under the antenna, has steel mesh reinforcement inside the concrete which is obviously affecting the antenna and groundwires especially.
Its a lot better than the sirio sd27 dipole though !!!
Had a signal check from a station 15 miles away. Old reading on the dipole was 1 and a half 'S' points and radio 3 audio. New reading a solid 4 'S' points and nice radio 4 to 5 !!!! So an improvement of 2 and a half 'S' points over the sirio sd27 dipole mounted at exactly the same height in the same position.

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Cozzmik
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26 Charlie Tango 465

:clap: Stealthy lil antenna you`ve made there Nik.....

With the way conditions are at present im sure you can have some nice contacts on that now your back on the air homebase... :thumb:
Edited by Cozzmik, Saturday, 29. September 2012, 14:27.
Paws for thought
The more idiots i meet the more i like my dog :dog:


Roses are red.
Violets are blue.
When I listen to AC/DC,
My neighbours do, too
.







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HomerBB
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2 Charlie Tango 004

Beautifully done.
Very sharp indeed, and not surprising that adding radials would result in an improvement to your performance.

Listen for me on 27.385 LSB.
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Offplanet
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26 Charlie Tango 104

Nice job Nik - you should do well on that :thumb:

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Nik Gnashers
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26 Charlie Tango 573

Images now uploaded to a new host !!!!

[imgw=700]https://i.imgur.com/cHu43ye.jpg[/imgw]


[imgw=700]https://i.imgur.com/P7b0tIf.jpg[/imgw]


[imgw=700]https://i.imgur.com/FP3Hdp9.jpg[/imgw]


[imgw=700]https://i.imgur.com/RO1jLVC.jpg[/imgw]


[imgw=700]https://i.imgur.com/qfvRDK9.jpg[/imgw]
M6GFT ::: QRZ Page- http://www.qrz.com/db/M6GFT
[imgw=150]http://i.imgur.com/RJjZCOw.jpg[/imgw]
All CT members are expected to use good operating procedure, good manners, and be friendly...Please do not chat on any calling frequencies, or use bad language on air, thank you it is appreciated.
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kayjay777
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26 Charlie Tango 2458

Hi everyone,
After building various antennas with mixed results, I decided to build a version of Nik Gnasher's 1/4 wave (pictured)
Pleased to report my first overseas dx contact in Northern Italy!! Well-happy :D

I built mine with 3 groundplanes, with the vertical being a simple piece of 106" #18 gauge copper wire inside a fibreglass tent pole.

Thanks again to Nik for this idea and pics.

Kev. :rock:
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Cozzmik
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26 Charlie Tango 465

Nice one Kev,

I have worked the world on some old wire and patience....and when the prop changes in a few years that antenna will do the same.

Of course you may of built something far more elaborate by then ;)



North Italy is a great contact... :thumbs:
Paws for thought
The more idiots i meet the more i like my dog :dog:


Roses are red.
Violets are blue.
When I listen to AC/DC,
My neighbours do, too
.







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kayjay777
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26 Charlie Tango 2458

Thanks Sam, I've really caught the bug after that! Got ideas for allsorts of antennas now! :thumbs:
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Nik Gnashers
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26 Charlie Tango 573

Hi Kev,
I am so pleased you built one yourself, and got overseas with it, even at this time of low solar activity.
At the peak, that antenna could quite easily work other continents !

It's a great buzz isn't it, knowing something you made can work so well.
I'm honoured I inspired you, good work matey !!
M6GFT ::: QRZ Page- http://www.qrz.com/db/M6GFT
[imgw=150]http://i.imgur.com/RJjZCOw.jpg[/imgw]
All CT members are expected to use good operating procedure, good manners, and be friendly...Please do not chat on any calling frequencies, or use bad language on air, thank you it is appreciated.
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kayjay777
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26 Charlie Tango 2458

Hi Nik,
Thanks for that :thumb: I'd been messing with homemade 1/2 waves and even a solid copper 5/8 wave! Trouble was, where I'm situated, whenever we get any wind here, being exposed, the antennas get bashed. Didn't realise you could make a 1/4 wave until I saw your post.
Anyway, this is so light, it withstood galeforce gusts last week so, well-pleased now.
Thanks again - may catch you on the sideband sometime !
Kev. :cb:
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Cozzmik
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26 Charlie Tango 465

Kev,

I have made a few wire antennas over the years but my Moxon using plastic plumbing pipe and wire inside was a cracker..

Worked as well as my Sirio Yagi :thumbs:





edit: Before the antenna guru`s get all technical and want to pick apart my claims i can only say that my Moxon was as good as my Yagi as i could`nt do actual back to back tests but contacts into Iceland and Canada gave me indication that they were similar and rejection was decent too.. :phew:
Edited by Cozzmik, Saturday, 5. May 2018, 08:28.
Paws for thought
The more idiots i meet the more i like my dog :dog:


Roses are red.
Violets are blue.
When I listen to AC/DC,
My neighbours do, too
.







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kayjay777
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26 Charlie Tango 2458

Hi Sam,
Thought about a Moxon, but can't find any decent build diagrams or youtube instructionals. Seen lots of info on here, but all the pics are Photobucket which are disabled.
Also have about 20 metres of speaker wire laying about if that would be any use for one?
Kev :shock:
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Cozzmik
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26 Charlie Tango 465

kayjay777
Saturday, 5. May 2018, 12:43
Hi Sam,
Thought about a Moxon, but can't find any decent build diagrams or youtube instructionals. Seen lots of info on here, but all the pics are Photobucket which are disabled.
Also have about 20 metres of speaker wire laying about if that would be any use for one?
Kev :shock:
I just typed in "how to build a moxon antenna for 11 metres" into google images and voila there were many pics and sizes of each element then i just used plastic plumbers pipe (terrain etc) and fittings ie 90 deg bends and tee`s to construct a frame for the wire to lay inside or even easier cable tie to the underside but centre of the pipe...i have no pics but it was a doddle :thumbs:
Paws for thought
The more idiots i meet the more i like my dog :dog:


Roses are red.
Violets are blue.
When I listen to AC/DC,
My neighbours do, too
.







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Nik Gnashers
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26 Charlie Tango 573

@ Sam

LOL @ 'disclaimer'

Please note : Other types of none-conductive pipe are available, and could be used by any number of tradesman - not just plumbers.
:D
M6GFT ::: QRZ Page- http://www.qrz.com/db/M6GFT
[imgw=150]http://i.imgur.com/RJjZCOw.jpg[/imgw]
All CT members are expected to use good operating procedure, good manners, and be friendly...Please do not chat on any calling frequencies, or use bad language on air, thank you it is appreciated.
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Cozzmik
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26 Charlie Tango 465

Nik Gnashers
Sunday, 6. May 2018, 06:12
@ Sam

LOL @ 'disclaimer'

Please note : Other types of none-conductive pipe are available, and could be used by any number of tradesman - not just plumbers.
:D
:thumbs:


Don`t want to discriminate against non plumbers do we ;)


Paws for thought
The more idiots i meet the more i like my dog :dog:


Roses are red.
Violets are blue.
When I listen to AC/DC,
My neighbours do, too
.







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kayjay777
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26 Charlie Tango 2458

Hi Sam, thanks for that. I Googled your search words and have found a good instructional with diagram on Pinterest, so have kept the link for next week when I can get to my local Wickes for plumbing parts. Meanwhile, just got back from a carboot with a 7 metre carbon fishing pole for a fiver....another project forming now lol :dance:
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