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Old June 20th 10, 11:27 AM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Apr 2010
Posts: 484
Default Direct connect 6 meter beam

On Jun 16, 5:24*pm, "R.Scott" wrote:
I see all kinds of crazy matching sections in posts about 6 meter
beams. *How about direct connect. *I have an A4S that has major issues
in the traps and I cant find the problem (IE I opened them and cant
find anything) SOOO I have a new A4S coming.

Has anyone taken an old 3 elem tribander and converted it to 6 meter
monobander using the direct connect.

Any Issues.

Would a 4 elem be better since its a long boom ?

I'm pretty sure I know the answers. Just want to confirm and see if
there is any reason not to direct connect rather than through a
hairpin or a gamma match.

Scotty W7PSK


There are at least 3 reasons to use some kind of a matching network.
1. impedance transformation - usually the feedpoint impedance of a
simple dipole in a yagi is not near 50 ohms so the matching system
gives you an easy way to adjust that.
2. it is often easier to build an aluminum element without a center
insulator and feed it with something like a gamma or T match.
3. to keep current off the feedline shield you need to go from the
unbalanced coax to a balanced dipole feedpoint. gamma matches and
others do that transformation for you.
 
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