motor allows switching even and odd channel numbers.
If you are getting just
even or odd channel on your satellite receiver it is very possible
you have a bad servo motor.
It could also be a cable problem but
it is not as common.
To test :
Unplug satellite receiver
Remove servo motor from
Connect red +, black -
, white pulse directly to rear of satellite receiver
Plug in satellite receiver
Change channels on satellite
If you can't hear smooth
motor noise switching, your servo motor is bad.