Just doing a little research and I found this interesting rotor from Eagle Aspen:
Here's what they claim:
"Introducing the new Eagle Aspen single cable off air antenna rotator; model ROTR100. The days of having to run separate “3 conductor rotor wire” between the drive unit and the control unit are in the past. Pro Brand has developed the ROTR100 utilizing DiSEqC code that sends commands to control the drive unit along the same coaxial cable that brings the television signals from the off air antenna into the house. Optional pre-amplifier power can also be supplied via this same cable. Whether performing a new install or retrofitting an existing antenna system, the ROTR100 provides for a fast and easy installation. Additional features have been added making the entire system installer and user friendly:
One Cable carries off-air signals, rotator power, control & pre-amp power
Hall Sensor Control: The industry standard for satellite control is now applied to off-air position control. Unlike competitive units, this unit does not rely on timing. The Hall sensors count every motor revolution resulting is 2░ accuracy.
High Torque: 120 inch lbs. of mechanical torque to handle up to a 133” boom length.
Pre-amp Power: 18VDC at up to 80 ma. When a pre-amp is not used, this is automatically sensed and the pre-amp power is switched off.
Display & Control: The indoor controller features a 000░ to 450░ digital compass display. 1.25 total rotation (450░) to allow for easy pointing to stations that are either side of north. Several methods of antenna control are provided.
• Up/down through the digital compass display
• Direct Access to a location (e.g.180░ for south)
• 99 programmable memory locations, which can be assigned
the same number as the channel being received
Handheld IR Remote: Software codes available on most higher end universal remote controls"
Now this sounds like an advancement in the field ot rotator technology. The manual can be found here:
Next question is - is this compatible with the CM7777 preamp? From what I read it's only compatible with preamps with output voltage of +17 VDC at less than 50 mA. From what I've read, the CM7777 is +18 VDC.