Hi, I have discovered what it seems like rectification in my HD Alu Tower where on the top there is antenna ball bearing thrust (SKF) below a 61D Prosistel rotor. I used various techniques to pin poi
Considering that the oil film in a well lubricated ball bearing is only a few microns thick, it doesn't take much voltage to bridge that gap. However, it is likely there are wear particles and worse
A long time ago I had a Rohn 25 tower with a Yagi on top turned by a Ham-M rotor. I experienced severe TVI on channel 2. Somehow, I don't know why, I got the idea that the bearings were rectifying. I
Interesting Grant. I wonder though how common this problem is. So I need to make ground loop that can make revolution round the tower when the antenna is being rotated. Yes I agree, to model a Yagi a
Kari, Not sure if you have a rotating tower or rotating mast. For my masts, the ground wire loop is the same design as the coax service loop at the top of the tower, they can be taped together. A u-b
I just use a piece of braid inside the tower from the mast to the tower. Because of the small diameter of the mast, it doesn't take much to make a loop. It bypasses both the rotator and the thrust be
I use braid as well ... that of my coax feedlines. The shields of the feedlines of my yagis are bonded to their respective boom-to-mast clamps (so if for any reason my coax gets wrapped around the m
Exposed braid will wick water and become useless pretty quick. I use covered stranded welding cable for all of my bearing and rotor bypasses. The ends of each cable terminates in a lug which is water
I may not have explained properly. I have long SO-239 barrals installed though my boom-to-mast plates as well as the bonding bars at the top and bottom of the tower. The coax feedlines connect to t
Several years ago, W3LPL alerted the ham community to the issue of passive intermod as a source of harmonics, identifying the junction of boom to mast through the rotator and switch mode power suppli