My experience with this Channel Master 9521A rotator. In early 2016 solid signal had a sale. I think each Rotator was $110. I decided to buy two. I was setting up a new array and my old array was about to get an upgrade and it had Radio Shack Rotator that was 26 years old. It wasn't doing a full rotation anymore.
I set up my new array and put 9521A underneath. Most of the weight of the array was taken up by not one but two thrust bearings so all the Rotator had to do was turn it without bearing any weight. It lasted from Spring through the summer and almost through the winter. Then it just gave out. So on a nicer afternoon in January or February I want to find my roof to change the rotator. One of the nice features of having two thrust bearings is you can change Rotator without dropping the mast.
I put the other new 9521A rotator in there and everything was fine for the next couple of months. But it also went out. I was so upset I just locked the antennas down and used them in the best aim.
I had sent some emails to Channel Master and even called them on the phone and everybody played stupid. They included how to the fact that the new 9521 HD had "some improvements"
I took the bottom cover off redistributed some of the grease which was still soft and pliable and hook the controller back up to it and it suddenly worked. Really? Is it possible for a rotator to have intermittent problems?
The one thing I noticed about both of these rotators felt sloppy. Here's the video.
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So, does anybody know what the problem is with these is it the slop? Did somebody mention that because the construction is so sloppy sometimes the gears can overlap and get stuck.