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M2 LEO Pack Antenna mounting
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K7IU - Marv
Does anyone have any insight into mounting the M2 LEO Yagis at the enter of their booms instead of at the ends, provided of course the crossboom and mast are fiberglass and not metal? I know that then mount is preferred so as to not distort the antenna pattern but is that still valid if a non-metal cross boom and mast are used? Will the boom to mast clamp itself distort the pattern enough to make and en-mounted boom preferable?
A center mounted boom eliminates the need for counter-balancing the crossboom and eliminating the torquing during elevation steps from the rotor. Thoughts? Marv K7IU |
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Steve [AA8AF]
I believe they sell a kit to center mount a couple of beams:
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Rob VE3RXH
Hi Marv
There will not be a problem using metal hardware to mount the Yagis at their centre, any effect on the radiation pattern/SWR/impedance will be very small. This is a recommended method from M2. Obviously you don't want to add more metal than is required, ie just use the two sets of U-bolts and a flat plate (one set of u-bolts attaches the Yagi to the flat plate and the second set attaches the plate and Yagi to the cross boom). That is the way our Club has had them mounted for years. Much more important is to use a non conducting boom, which you have mentioned already. Good luck! Rob VE3RXH |
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Max Baker
So, anyone have a link to a good non-conductive boom? I imagine fiberglass would be the best material? Carbon fiber? I can find 1.25 inch rods of fiberglass in 5ft lengths on line.
Max |
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Brad Ko6kL
you can get 6 to 20foot long fiberglass almond knocking poles at hardware stores pretty cheap, iv used them to support wire antenna ends. you might wrap it with tape to protect it more. that is whats on the top of this one. |
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Max Baker
Thanks for the tip, Brad. I'm searching all our nearby hardware outlets on line and nothing about fiberglass almond knocker poles. I'm assuming they go by some other name in the stores? Closest I've found are fruit picker poles, but they are all aluminum or fiberglass/aluminum. Maybe it's a California thing. Although Amazon didn't turn up anything either.
Thanks again! Max |
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