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Author Topic: matcher for beqm antenna  (Read 665 times)
DU2YOC
Member

Posts: 17




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« on: November 16, 2001, 06:18:58 AM »

any suggestion on how to make a good matcher for a yagi antenna for 2 meter.
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KL7IPV
Member

Posts: 984




Ignore
« Reply #1 on: November 19, 2001, 12:16:15 AM »

I have a Cushcraft 5 element yagi and the matcher for that is a piece of coax cut to full wave length  for 2 meter and mounted to the antenna. For info go to: www.cushcraft.com
Look in the technical manual for a 2 meter yagi and it should show you parts and what may help you fashion the match you can use. Good luck.
73
Frank
KL7IPV
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WB6BYU
Member

Posts: 13331




Ignore
« Reply #2 on: November 21, 2001, 11:12:00 AM »

I have had good luck using a delta match on homebrew 2m yagi
antennas.  I use a half-wave coaxial balun to step the coax up to
200 ohms balanced.  Then I take two pieces of solid, insulated wire
(perhaps 1mm wire size, but it is not important) about 30cm long.
I wind half of each piece around the driven element, and use the
remaining length to connect to the balun.  This provides capacitive
coupling between the wire and the element, but without any direct
metal contact (which reduces problems with corrosion when using
copper feedline on aluminum elements.)  The coils of wire can be
slid along the driven element to find the right tap point - 25% of
the element length out from the center is a good start.

I have found this very easy to build and adjust.
Logged
WB6BYU
Member

Posts: 13331




Ignore
« Reply #3 on: November 21, 2001, 11:12:19 AM »

I have had good luck using a delta match on homebrew 2m yagi
antennas.  I use a half-wave coaxial balun to step the coax up to
200 ohms balanced.  Then I take two pieces of solid, insulated wire
(perhaps 1mm wire size, but it is not important) about 30cm long.
I wind half of each piece around the driven element, and use the
remaining length to connect to the balun.  This provides capacitive
coupling between the wire and the element, but without any direct
metal contact (which reduces problems with corrosion when using
copper feedline on aluminum elements.)  The coils of wire can be
slid along the driven element to find the right tap point - 25% of
the element length out from the center is a good start.

I have found this very easy to build and adjust.
Logged
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