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I did something similar when I lived in Los Angeles. I mounted a 5-element 10-meter beam under the satellite antennas on the tower in the attached photo. This required increasing the length and wall thickess of the mast and changing the azimuth rotator to a more powerful version. Note that the tower is the heavy-duty model and has an extension to accomodate a thrust bearing. The tower was not fully extended in that configuration so that the top of the new mast didn't exceed the original height of 45 feet.
However, I reread a mechanical engineering textbook from college and did the necessary calculations to prove that it wouldn't blow over before trying it. The wind load has to be kept close to the tower. CP yagis have a much lower wind load than a 3 foot dish so this my not work in your case.
The 6 m beam or the 3 foot dish could be mounted separately as I did in the photo.
73,
John KD6OZH
----- Original Message ----- From: [email protected] To: "AMSAT-BB" [email protected] Cc: "NW VHF" [email protected] Sent: Tuesday, January 20, 2009 08:42 UTC Subject: [amsat-bb] springtime project
Hello Before I reinvent the wheel I want to run this project by you. My current satellite antenna system is on a 15 foot tripod using a G5400 az/el rotors. Consists of 14 el cp 2M yagi, 40 el cp 70 cm yagi, 3 foot dish for S band 16 turn helix for L band. I want to change the tripod to a 30 foot tower and add a 5 el 6 M beam. Question- put the satellite antennas just above the top of tower and the 6M beam above the satellite ants. high enough as not to interfere with the sat. antennas when rotated in elevation. Then if possible have the whole thing being able to tip over. Has anyone come close to doing something like this? Or any ideas. 73 Bob W7LRD CN87
-- "if this were easy, everyone would be doing it" _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb