Dipole for 10m band
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Dipole for 10m band
I am going to build a dipole for my SS9900 for use at home,
Instead of wire as it will be short arms 2.64mtrs could I use 15mm copper pipe, any help would be appreciated.
Instead of wire as it will be short arms 2.64mtrs could I use 15mm copper pipe, any help would be appreciated.
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Re: Dipole for 10m band
weight, difficulty in trimming to match vswr, weight, and erm, weight.
But yes it should work, as would and does aluminium tubing.
But yes it should work, as would and does aluminium tubing.
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Re: Dipole for 10m band
another thought is seek out old fiberglass fishing rods and run a length of copper foil down the length of it and yatch varnish it(it does work!)rods
they are light and strong-worth a thought..?
they are light and strong-worth a thought..?
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Re: Dipole for 10m band
2x tankwhip do the job nicely.
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- ghost123uk
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Re: Dipole for 10m band
+1 on that
Plus, you can "play" by trying out other "twigs". I tried loads, just for fun. Even 2 x 2 foot "Dial-a-Match" ones worked, well, tuned in anyway
Here using a 4 bolt type mirror mount which neatly attaches to my 4 Mtr Glass Fibre "landing net" pole (which has the added advantage of being telescopic and light weight). Note, I don't think a carbon fibre pole would work the same as they are conductive.
The pole is in the "down" position in these pics
John, on the S. Cheshire / N. Shropshire border. 26TM953 / muppet handle "Grey ghost"
Don't just monitor, key up and talk, otherwise everyone thinks no one else is out there !!!
Don't just monitor, key up and talk, otherwise everyone thinks no one else is out there !!!
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Re: Dipole for 10m band
Hi Steve,Steveb8218 wrote: ↑03 Jun 2020, 22:25 I am going to build a dipole for my SS9900 for use at home,
Instead of wire as it will be short arms 2.64mtrs could I use 15mm copper pipe, any help would be appreciated.
You didnt really say how or where you are mounting it?
Will it be vertical or horizontally polarised?
You can use 15mm copper, but the length you calculate will be smaller than the wire dimensions on account of velocity factor and skin area of the tube.
You could use 2" tube which would be shorter still, although not very practical.
One advantage of larger tube is the bandwith increases.
And then ofcourse is tuning it, it becomes a pain to keep trimming both ends equally to keep it balanced (Electrically) .
Lighter aluminium would probably be better especially if you can make it tapered with one sliding inside the other.
Certainly makes tuning easier.
Others have mentioned two of the eight foot whips, however horizontally they tend to bent downwards and the cost of two and then a centre piece would get quite expensive.
If you definitely want a dipole then try one of these, they are cheap enough and can be tuned to 10m.
http://www.kcb.co.uk/contents/en-uk/p51.html
Cheers Mark
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Re: Dipole for 10m band
Link not working at my end Mark.DX-Digger wrote: ↑04 Jun 2020, 19:20
If you definitely want a dipole then try one of these, they are cheap enough and can be tuned to 10m.
http://www.kcb.co.uk/contents/en-uk/p51.html
Cheers Mark
But for some reason, this (which looks the same) does work (at my end).
http://www.kcb.co.uk/contents/en-uk/p51.html
John, on the S. Cheshire / N. Shropshire border. 26TM953 / muppet handle "Grey ghost"
Don't just monitor, key up and talk, otherwise everyone thinks no one else is out there !!!
Don't just monitor, key up and talk, otherwise everyone thinks no one else is out there !!!
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Re: Dipole for 10m band
Strange its the same link? Ahhh I see why, its because I added the Bold font to the url.
My error
Anyway reading the info they actually say its not very good in winds, so maybe some doweling or thin cane up the inside of the tubing would be in order.
Maybe thats why its so cheap??
Thanks for posting the working link
Cheers Mark
My error
Anyway reading the info they actually say its not very good in winds, so maybe some doweling or thin cane up the inside of the tubing would be in order.
Maybe thats why its so cheap??
Thanks for posting the working link
Cheers Mark
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Re: Dipole for 10m band
Two big lumps of copper horizontal = poor idea.
There will be 0.01dB difference using lightweight wire. Besides CB and 10m mobile operation is vertically polarised. The ionosphere mixes polarisation, so with DX your polarisation usually makes no difference.
Says a crusty old ham.
There will be 0.01dB difference using lightweight wire. Besides CB and 10m mobile operation is vertically polarised. The ionosphere mixes polarisation, so with DX your polarisation usually makes no difference.
Says a crusty old ham.
... www.M0RZF.co.uk ...
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Re: Dipole for 10m band
Actually with F2 propagation Polarisation usually stays the same and the Majority of Hams use beams on 10Metres or longwires.
Most beacons use Bigwheel Horizontal polorised antennas.
And yes 15mm copper tubing can be unweildy but the point I was making is the thicker the diameter the wider the bandwidth of the antenna.
And with Sporadic-E yes the polorisation can and does change quite often. But Less so with F2 propagation.
Says an even more crusty old ham
Most beacons use Bigwheel Horizontal polorised antennas.
And yes 15mm copper tubing can be unweildy but the point I was making is the thicker the diameter the wider the bandwidth of the antenna.
And with Sporadic-E yes the polorisation can and does change quite often. But Less so with F2 propagation.
Says an even more crusty old ham
ʎɐqǝ uo pɹɐoqʎǝʞ ɐ ʎnq ı ǝɯıʇ ʇsɐן ǝɥʇ sı sıɥʇ