Thread: Matching Issue ........... I think!
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Old January 31st 07, 07:36 PM posted to rec.radio.amateur.antenna
Jim Kelley Jim Kelley is offline
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First recorded activity by RadioBanter: Jul 2006
Posts: 666
Default Matching Issue ........... I think!


wrote:

I recently built a modified vertical dipole
from wire and using a pole and trees as supports.
I had hoped it would work on 2 bands 75 and 40 but it only
works on one 75 where the VSWR is 1.3:1 and the bandwidth is 85 khz
for the 2:1 points.

On 40 meters the VSWR is over 10:1 so I thought I could use a 1/4 coax
matching section 50 ohms but this doesnt solve the problem either as the
VSWR doesnt change much with the extra coax section.

I did cut the section properly as the velocity factor for the coax is .78%
which gave me 26.825 ft.

Not sure what I am doing wrong or assuming - but looks like I could
use some input.

Try a half wavelength of coax.

ac6xg

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