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#8
January 30th 16, 10:32 PM
posted to rec.radio.amateur.antenna
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Rotatable couplings?
rickman wrote:
On 1/30/2016 1:24 PM, wrote: gareth wrote: One of the problems with beams is the cable winding around the mast if you try to turn too far in one way or another. These difficulties have long been solved in the world of radar, so, has anyone conceived of an infinitely rotatable 50 ohm coupling for our beam antennae? Sounds like a $200 solution to a $0.75 problem, i.e. an extra foot or two of coax to allow slack for turning. I think the issue is that you have to manage the turning so you don't go too far in either direction before reversing. Commercial rotators only turn +/- 180 degrees. If you are building your own, adding limit switches is far simpler, cheaper and more reliable than a rotary coupling. As the supply of WWII and Korean war prop pitch motors has pretty much dried up and they cost more than a used commrcial rotator ready to go, I don't see much motivation for building a rotator from scratch these days. -- Jim Pennino |
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