I am sitting here looking at the pictures of this monster antenna,
wondering how you would ever get something like this into the air. My
hat's off to the guys who managed to put this up. Amazing feat. How do
you think they did it? It obviously has to be assembled while in the
air. Do you think the guys crawled out on that boom to bolt the elements
into place?
Full size quad, 3 elements on 80 meters, 5 elements on 40 meters on a 30
meter boom.
http://www.pbase.com/df3kv/image/46485731
http://www.pbase.com/df3kv/image/46485719
Jerry, K4SAV
peter.voelpel wrote:
>The best approach is to use slewing bearings at the bottom of the tower.
>This freestanding, 40m high, rotatable tower of a fellow ham
>with stacked long boom quads works flawless for more the 20 years:
>
>http://www.pbase.com/df3kv/image/46485734
>
>http://www.pbase.com/df3kv/image/46485728/original
>
>those bearings are obtainable pretty cheap at crane companies
>
>73
>Peter, DF3KV
>
>
>-----Original Message-----
>From: towertalk-bounces@contesting.com
>[mailto:towertalk-bounces@contesting.com] On Behalf Of Kelly Taylor
>
>My big fear with a tower such as this is that instead of multiple weak links
>(ring rotors), where perhaps one antenna bites it, you have one big weak
>link that would make the whole assembly bite it. The other angle that is
>perhaps not been explored either is the capacity of the tower to accept
>additional loads along its length.
>
>If I recall correctly, the Big Bertha tower worked because the entire tower
>base was inserted into the bearings which were held down by lots of concrete
>and because the design assumed from the start multiple antennas from top
>down.
>
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