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Author Topic: 11 meter antenna mod to 10?  (Read 821 times)
KB7FFC
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Posts: 6




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« on: July 23, 2009, 09:07:27 PM »

I'm not really that cheap but I'd like to reutilize an old 11 meter antenna for use in secondary vehicle. Any suggestions? Reduce,recycle,Reuse. Free speech involves speaking out! Thanx proactive
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K4JC
Member

Posts: 76




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« Reply #1 on: July 24, 2009, 05:41:47 AM »

Depending on the quality of the antenna, an 11 meter antenna usually works fine on 10 after re-tuning. A lot of hams use the Wilson 1000/5000 series antennas and have excellent results (I have one cut to 29.6 for FM work and it's fantastic!) I have also heard of some hams being successful with the "Firestik" type antennas. But watch out for the cheapie antennas you find at discount or auto parts stores. They usually aren't worth the materials they're made of and perform worse than the proverbial wet noodle!
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K0BG
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Posts: 9899


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« Reply #2 on: July 24, 2009, 06:27:06 AM »

What's even more important is where and how you mount the antenna. Visit my web site for more details.

Alan, KØBG
www.k0bg.com
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WB2WIK
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Posts: 20666




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« Reply #3 on: July 25, 2009, 07:36:16 PM »

I've used a lot of 11m antennas on 10m without doing anything to them.

Best example I can think of was using my old Antenna Specialists "Super Magnum" CB base station antenna (purchased from a neighbor for $10 -- I've never even been on CB!) strapped to my chimney in Mt. Arlington, NJ back in the early 70s.  I never re-tuned it in any way and worked more than 90 DX countries with it.

WB2WIK/6
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KI4SDY
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Posts: 1452




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« Reply #4 on: July 30, 2009, 07:10:32 AM »

Good quality CB antennas are very broadbanded. You do not need to trim or cut anything. All that does is destroy a good antenna. If you are using a 9' foot whip, just take the spring off and you will be tuned between 10 and 11 meters and can use it for both with very low SWR. Add a Dosey switch box and you can use the same antenna to receive on both radios at the same time. Remember to turn off the radio you are not using, as isolation is not as good as we would like with switch boxes.

After the installation, check everything with a good SWR meter to protect your transmitters!

If you are using a good base loaded coil antenna like the Wilson, just tune it for the band you want or in between and use it for both.
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