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Author Topic: SIMPLE BEAM ANTENNA  (Read 301 times)
W4RCH
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Posts: 7




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« on: March 01, 2007, 02:53:02 PM »

I AM LOOKING FOR A SIMPLE MULTI BAND STARTING AT 10M BEAM OR ROTATABLE DIPOLE ANT. TO BUILD.  ANY IDEAS?   THANKS, RUSS W4RCH
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N5KBP
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Posts: 294




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« Reply #1 on: March 01, 2007, 03:14:14 PM »

The simplest multiband beam to homebrew I know of is the old tried and true quad. I personally prefer extended doublets for multiband use. Not steerable but works great  for multiband use.
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W9XAN
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Posts: 43




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« Reply #2 on: March 01, 2007, 04:21:03 PM »

I recommend trying W4RNL 's excellent site,
www.cebik.com
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KA5N
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Posts: 4380




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« Reply #3 on: March 01, 2007, 04:24:58 PM »

See
http://www.w5dxp.com/rotdip.htm

Which describes about the simplest multi-band rotatable antenna you can build.  Another simple multiband antenna is an "8JK"  invented by John Kraus
W8JK and consists (in its simplest form) of two dipoles fed with open wire line with an interconnecting phasing line.  You can find it described in almost any
age ARRL Antenna Book.
Good luck Allen
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K5PEW
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Posts: 223




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« Reply #4 on: March 01, 2007, 07:13:41 PM »

This wire tri-band beam may not be great for a base installation, but it seems like a great idea for a Field Day type situation.

http://www.arrl.org/tis/info/pdf/0111035.pdf

I hope this helps you.

Graham Welch - K5PEW (In memory of Paisley Elizabeth Welch)
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KG4YTL
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Posts: 127




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« Reply #5 on: March 02, 2007, 09:00:13 AM »

The Extended Double Zep is the easiest one I know.  It is just a dipole that has been lengthened to 1.25wl instead of 0.5wl.  It has at leat 3dBd of useful gain and good front to side ratio.  If you want more of a yagi pattern, you can add reflectors to it and get F/B ratio and also another 3dB.  You can also multiband it.  Lower bands have predictable radiation patterns broadside to it.  Upper bands get unpredictable.   Down side is you have to feed with ladderline and a tuner, and the extra length might make it hard to rotate.  I use mine fixed.  If I want another direction, i switch to another EDZ pointed another way.
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ONAIR
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Posts: 1744




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« Reply #6 on: March 03, 2007, 11:34:42 PM »

    I heard about a guy who built a wire beam inside of PVC pipe, and used a closthline/pulley set up to turn it!
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AE0Z
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Posts: 14


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« Reply #7 on: March 05, 2007, 11:38:04 AM »

Google for hexbeam.  There is an active Yahoo Group on this topic as well. They are very compact and perform well.
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Howard AE0Z
1 Peter 4:10
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