[TowerTalk] Long rotor run

[Bill Cotter]

Ed,

I run about 450ft of 10/3 w/gnd from my shack to one of the prop 
pitch rotors on the back tower. To understand how well things were 
working topside, I also ran 450ft of CAT-5 cable (8x #22 twisted 
pairs) from the shack to the rotor, and connected on pair to common 
and CW, and another pair from common to CCW. The third pair is used 
for the pulse counter to indicate position. Back at the shack I can 
view the voltage at the motor terminals with a hi-Z digital voltmeter.

The controller puts about 28VDC on the CW/CCW line to spin the 
rotor, and I find I lose about 1-2VDC in the long run of cable 
depending on the temperature and motor loading. The point here is 
for next to nothing (CAT-5) I am able to measure the rotor voltage 
at any time to see how it's doing.

Using this cheap "sense line" technique came in very handy when I 
suspected the 4-square wasn't working correctly. I found that one 
of the wires in the multiconductor cable buried underground to a 
hit from the gardner's shovel.

73 Bill N4LG




At 10:56 AM 11/21/2011, Ed Stallman wrote:
>I'm using a tail twister rotor 350 ft form the control box turning a
>2 el quad, This problem reoccurs each winner when the wind blows
>..Well in fact any time the wind blows .. With the wind 20 mph or
>more the rotor stalls , I did use # 14 wire on the motor leads and I
>have a junction box at the base of the tower were I change to regular
>rotor cable going up the tower .
>
>Heres my Question, can I put a Start or Run Capacitor in my junction
>box and still leave the capacitor in the control box ? would this
>help?  Another  thought was , could I replace the transformer in the
>control box to a little higher voltage ?
>
>Thanks Ed
>
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