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Sonny
Intermediate Member
Username: Sonny

Post Number: 123
Registered: 5-2004
Posted on Tuesday, November 28, 2006 - 4:35 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

If you mount a beam in the vertical position what problems does the mast pose to it
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Bruce
Senior Member
Username: Bruce

Post Number: 4194
Registered: 9-2003


Posted on Tuesday, November 28, 2006 - 5:46 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

It will detune it and distort the main lobe ...
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Sonny
Intermediate Member
Username: Sonny

Post Number: 124
Registered: 5-2004
Posted on Tuesday, November 28, 2006 - 7:12 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Bruce so no matter what a mast will detune it is that why a Gismichy is shaped like a upside down Y ? therefore elimating the mast problem
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Bruce
Senior Member
Username: Bruce

Post Number: 4196
Registered: 9-2003


Posted on Wednesday, November 29, 2006 - 6:59 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I might help but I'm a fan of stacking 2 antennas side by side ( I did this on 2 meters ) and that seems to solve the problem.

My arrow beams had a very clean frount lobe .....
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Uillean
New member
Username: Uillean

Post Number: 1
Registered: 12-2006
Posted on Monday, December 04, 2006 - 9:56 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

It's not just the mast distorting the pattern, a yagi mounted in the vertical plane will have a broader main lobe and lower gain than when mounted in the horizonatl plane-- unless it is mounted several wavelengths above ground. And stacking them doesn't help that.

That's why I built a quad.

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