- April 27, 2016 at 8:45 am #2399
Greeting Elmer Forum
i am about to set up my http://www.k4kio.com hex beam antenna.
Channel Master 1850 43 foot steel mast
hex beam 20-6 meter array (29lbs) .5 m2 wind load
guy rope, and hardware
4rcs-l remote antenna switch http://www.hamradio.com/detail.cfm?pid=H0-007709
seeking advice from folks who ideally have set up a hex beam on the setup itself.
i see some peel using a thrust bearing with the rotator on the bottom of the mast and some using the rotator at top, I can see advantages to both, but wondering what the group thinks?
i plan to have the elevation at about 35 feet.
i am thinking about sinking a 10-12 foot 4×4 in concrete at the base and mounting the mast to it, so I can at least use a ladder as I am extending the mast when deploying the antenna. Thoughts?
thanks to all in advance for helping a newbie out, just got my tech license in March, and my general in April. Hopefully may brings extra, but as I am building out my shack it becomes clear how much I have to learn…
gregApril 27, 2016 at 11:02 am #2406
FB on your Hex Beam project. This will make a very good antenna system.
A 35 ft mast will certainly need to be guyed at 2 – 3 levels. If you can get guy rings for your mast which will allow the mast to rotate inside the guy rings, then mounting the rotator at the base of the mast on a concrete pad will allow you to service the rotator if you need to. If you do this, you will need some sort of thrust bearing arrangement to take the weight of the mast off the rotator. Without this, the with of the setup will probably cause the rotator to fail at some point. If you put your rotator on the top of the mast, it can probably handle the weight of the text beam without a thrust bearing.
I would be a little careful with trying to use a ladder resting against the mast to service the setup. If the mast is not strong enough and guyed strongly, you’d run the risk of the setup collapsing while you where on the ladder. Can you get a small lift into the area? This may be s safe approach if you can get a lift close and on solid ground.
Don’t forget to include a rotator loop in you coax. Leave enough slack for the antenna to turn its full rotation in both directions without stressing the coax.
One additional thought, you might try to build or purchase a PC interface for the rotator controller. This will make point the antenna at individual stations much easier.April 27, 2016 at 12:20 pm #2415
Fred I think having the 4 x 4 concreted in the ground provide to me a couple of options that I might not otherwise have it allows me to elevate the rotor should I go with the bottom mounted rotor as opposed to a mast mounted rotor that really enables me to keep the rotor out of the snow in the winter time. The additional rigidity that the 4 x 4 provides would allow me to actually put a ladder on the 4 x 4 not in the mast itself which should help when extending the mast. Also I am hoping it will provide horizontal support additional to the guys.April 27, 2016 at 12:45 pm #2416
Sounds like a plan. Is the location a potential site for a tower upgrade at a future time? If so, you might what to build your concrete base to Rohn’s specs for 25G or perhaps a 45G tower in the future.
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