Originally Posted by Larry Kenney
I replaced both CM rotors about a year and a half ago (December, 2011) with Phillips SDW rotors, recommended by several as the best without going with the very expensive ham rotors. They've been working well, except that I keep having to calibrate them frequently. They tend to get out of alignment quite easily.
According to Solid Signal that rotor is discontinued but the RCA VH126N looks to be the same thing. Too bad there isn't something in the middle price range for a TV rotor, maybe about $200. If you can find a used one, the old Alliance HD-73 is a very good rotor. The only problem they ever had was the cork disk that functioned as a brake on the motor could become sticky and not release when power was applied and the rotor wouldn't turn. This is easily repaired by disassembling the rotor and cleaning the disk. If you ever find one that the owner says will not turn, chances are that's all that's wrong with it.
The inexpensive TV rotors can never stay in synch because there is no pot in the rotor to tell the control box where it is pointed but instead depends on the rotor moving at the correct speed all the time. That's almost impossible. I suppose if you only move the antenna a couple times a week you can deal with the frequent resynchronization but if you move it several times a day you'll become frustrated fast.
Edit: I found a place selling rebuilt rotors including the HD-73.
They want $400 for an HD-73! That's crazy. You can buy a Yaesu G-800S for $400 new and it's a better rotor. I would consider anything over $200 for a HD-73 to be too much. Originally they sold for under $100 back in the 70's and 80's.
Edit #2: There are two HD-73 rotors on Ebay right now at decent prices if anyone is interested. Both have the lower bracket which is a must for pole mounting.
ChuckEdited by Calaveras - 5/2/13 at 7:53am