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Author Topic: 10 meter antenna  (Read 10838 times)
KJ4DHI
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Posts: 40




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« on: October 05, 2012, 01:39:08 AM »

I have heard many references made about using modified cb antennas on 10m. Any suggestions about what to use would be greatly appreciated.
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W5DXP
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« Reply #1 on: October 05, 2012, 04:29:54 AM »

I have heard many references made about using modified cb antennas on 10m. Any suggestions about what to use would be greatly appreciated.

A rotatable dipole made from two 10m hamsticks and height=20~40 feet makes a dandy 10m antenna. It will beat most omnidirectional CB antennas by about one S-unit.

I personally use a 20m rotatable dipole at 40' fed with an odd number of 1/4WL of 300 ohm transmitting line (Wireman #562) with no tuner required. The actual Z0 of that line is about 280 ohms. EZNEC says the gain on 10m for that 20m dipole is 9.5 dBi at a TOA (take-off-angle) of 12 deg.
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M6GOM
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« Reply #2 on: October 05, 2012, 05:53:53 AM »

Build a Moxon antenna. 12ft x 4ft, 10dBi gain. It'll trounce anything vertical you can put up.
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N4NYY
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Posts: 4820




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« Reply #3 on: October 05, 2012, 06:04:13 AM »

I have the Imax and can be tuned for 10-17. It works well on 10-15, and so-so on 17. I have a ground plane kit and 42' mast. I have worked QRP DXCC with it.

Saying that, the moxon would be far better. The only question is cost. Imax is about $100. I would think you can build a moxon a lot cheaper.
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WB6BYU
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Posts: 13573




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« Reply #4 on: October 05, 2012, 08:30:22 AM »

Use whatever you happen to have handy, or can find cheap at a garage sale.

CB antennas are often cheaper than ham antennas simply because of the greater
volume.  (The claims are more outrageous, too, but you can ignore those.)  Any
CB antenna will work:  some don't even require any readjustment, but those that
are adjustable can almost always be shortened from 27 MHz to 28.5 MHz.

This applies to mobile whips, ground planes, yagis, etc.  So the first question is,
what sort of antenna are you looking for?

Personally I wouldn't buy a brand new full-price CB antenna just to use on 10m,
because I can build one out of wire or junk in my barn much cheaper.  But not
everybody is in the same situation.  (And a good part of my stash of aluminum
tubing came from old broken CB antennas.)

A simple vertical dipole or ground plane will give good performance on 10m. 
Don't get carries away with the CB antenna hype:  an antenna that is 5/8
wave 20') doesn't give any significant advantage over one that is 1/2 wave
(18') regardless of what the advertising says.  But, unless you are using it
for mobile operation, look for one that is at least full-sized (9' vertical and
radials for a ground plane, 17' for a vertical half wave / dipole) then choose
among those based on what fits your needs for mounting, etc., and what
is cheap and easily available.
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WA3SKN
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Posts: 5555




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« Reply #5 on: October 05, 2012, 12:11:31 PM »

Depends on frequency.  If you want a simple low cost 10 meter antenna centered in the Tech SSB portion of the band at 28.4 MHz, why not just build a 10 meter coax fed dipole?  Try 8 ft 3 inches to a side, coax fed, and up as high as practical.  You can mount it horizontal or vertical.  You will want the band open, though!  E-skip and F2 openings have been around lately during daytime hours.
73s.

-Mike.
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N4AEQ
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Posts: 91




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« Reply #6 on: October 05, 2012, 04:46:09 PM »

 Imax has the best rx of any 10 meter antenna I have ever used, it's 24' tall so it has alot of
capture area. It dosen't require a tuner on 10-12meters, 17 requires longer radials or a tuner. With a tuner you can easily use 15 & 17 with or without radials, good antenna if you can find one used/cheap.
 Dipole on 10 just isn't that great, moxon would be the best homebrew antenna if you into DIY. The smaller Antron99 will work but dosen't rx/tx near as well, 1/4 ground planes work well for swr but just, don't rx very well, like any antenna the more wire/area you have the better it will receive.
« Last Edit: October 05, 2012, 04:50:52 PM by N4AEQ » Logged
K8AC
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Posts: 1478




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« Reply #7 on: October 05, 2012, 06:04:19 PM »

Here's another idea: you can build a nice 3 el 10M yagi out of stuff sold at Home Depot or Lowes.  My first beam, built in the early 1960s, used steel electrical conduit for elements and heavier conduit as the boom.  Worked a ton of DX with that antenna, turned by a TV rotor. 

73, K8AC
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KE4VVF
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Posts: 61




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« Reply #8 on: October 06, 2012, 02:22:58 PM »

Made a rotatable dipole from two 102" SS CB whips and a MFJ-347 dipole bracket.  Works very well on 10m and 12m.

Also have an IMAX 2000. Great Rx / Tx on 10m and 12m. Fair on 15m. Bites on 17m.

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N2SLO
Member

Posts: 66




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« Reply #9 on: October 06, 2012, 04:18:26 PM »

I have heard many references made about using modified cb antennas on 10m. Any suggestions about what to use would be greatly appreciated.

If you want to get on 10M, buy an IMAX 2000. I have seen several posts and old school operators that think the IMAX is a "CB" antenna. Fact is the antenna will radiate effectively between 10-12M, including the 11M CB band. Call it whatever you want, the IMAX 2000 is a 5/8 vertical, and effective on 10M. If you have a radio with an antenna tuner, no cutting required. Just plug and play, make sure you get good cable. Proof: I put mine up in 2010, just in time for the real fun on 10M when cycle 24 went nuts last September. 70 countries confirmed in two months, with only 100 watts, including Japan, New Zealand, etc.... It works. Costs about $90-100, why bother with used materials, do it once and be done.
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N8CMQ
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Posts: 403




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« Reply #10 on: October 06, 2012, 08:38:57 PM »

I have a modified 11 meter three element beam that works great on ten meters.
It uses a tv antenna rotor to swing it and it works very well in the horizontal polarization.
I also had a ground plane mounted at 30 feet that I used for nets back when I did nets, but I have a ground mounted vertical now.
If you decide to make a yagi, you can also add a two element 15 meter beam to the same boom.
There are so many ideas for antennas, use your imagination!
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N8CMQ   Jeff
KB1TKQ
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Posts: 19




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« Reply #11 on: October 22, 2012, 09:48:57 PM »

I just put up a Imax 2000 and am very happy with it. As others have said...great rx and tx on 10, 11, 12 meters.
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KU4UV
Member

Posts: 376




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« Reply #12 on: October 25, 2012, 08:10:57 PM »

When 10 meters is open, almost any type of antenna that has been cut for 28-29 MHz will work just fine.  I have used both dipoles and modified C.B. antennas on 10 meters running only a 25 Watt rig and made contacts all over the world.  I had a 10 meter dipole in my apartment when I lived in Lexington, Kentucky that I made plenty of contacts with.  When you consider that a 1/2 wave dipole for 10 meters is only going to be about 14 feet total length, it doesn't take too much to get on the band.  I remember back in the summer of 1998, 10 meters was wide open to almost anywhere in the world on any given day.  I borrowed my brother's Ranger 2950 and cut a Radio Shack C.B. antenna down to 28 MHz.  I remember one day working Hawaii, Guam, and Australia all in the course of about 30 minutes with this setup.  Good times!

73,
KU4UV
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W5DXP
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Posts: 3639


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« Reply #13 on: October 26, 2012, 05:10:53 AM »

I remember one day working Hawaii, Guam, and Australia all in the course of about 30 minutes with this setup.  Good times!

Even better was the record high sunspot cycle 19 in 1959. I was operating W5AC at the time.Smiley
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