[amsat-bb] KR-400 transformer wiring

[Hans BX2ABT]

I got this old KR-400 azimuth rotor as a gift, but is wired for 220V and 
I need to run it off of 110V. The transformer's wiring now looks like this:


      |  220V  |
      |        |
|~~~~|~~~~|   |~~~~|~~~~|
5    1    3   6    2    4
|                  |
|__________________|


If the drawing is messed up, here is the gist of it: The primary 
consists of two (parallel/separate) windings, one with odd, one with 
even numbering (3-5 and 4-6) with the center of the winding named 1 and 
2. Currently 2 and 5 are shorted and 220V comes in at 1 and 6. So 
current flows from 1 to 5 to 2 to 6 and vice versa.

To rewire to 110V I guess I just use any of the combination 1-3, 1-5, 
2-4 or 2-6. But I am just curious why the 220V wiring was done over two 
coils, not one? Was this factory standard or has my unit been modified 
with a different transformer?

Once I get the control unit powered up it time to test the rotator and 
see if it needs any maintenance (probably will, because it hasn't been 
used for a long while).