[TowerTalk] OR2800 rotor cable

[bill steffey]

The pulses from the motor drive (one pair) couple into the other pair,,(The mag sense signal) and confuse the hell out of the controller.
The suppied connector at the rotor got moisture and e
Did the same thing,,,coupling at the drive pulses reight into the sense line. I figured that out thew hard way aftere recalibrating many times,,,
Bill

Les Kalmus <w2lk at bk-lk.com> wrote:

>On an Orion, two wires are used for DC to drive the motor. The DC is 
>reversible to reverse direction.
>Two wires are used to carry pulses from a reed switch activated by a 
>magnet on the rotator motor shaft.
>These pulses are a notorious source of noise when the rotator is in motion.
>M2 recommends shielded cable, i.e. RG-58 to suppress that noise.
>Googling around will find several references to this and various solutions.
>
>Les W2LK
>
>Jim Brown wrote:
>> On Thu, 22 Apr 2010 04:28:58 +0000, k2wd at comcast.net wrote:
>>
>>   
>>> Anyone know where I can find suitable rotor cable for the OR2800 rotor (2x 
>>> 12ga, 2x 18ga shielded pair). 
>>>     
>>
>> 3x#12 is very common house wiring (phase, neutral, and a ground). Shielded 
>> twisted pair is quite common in the pro audio world. BUT -- take a careful 
>> look at what the circuit is doing. Is the shield ONLY a shield, or is it 
>> also an active conductor?  Very common usually means very inexpensive. 
>>
>> We have learned in the pro audio world that a foil/drain shield on twisted 
>> pair has terrible RFI properties. On the other hand, an unshielded twisted 
>> pair has very good rejection of noise and RFI. 
>>
>> I suggest that you study the rotor control to see exactly what those cables  
>> are connecting. In my Yaesu rotor, one pair runs a DC motor, and three 
>> conductors monitor the position of a rotary pot that indicates rotor 
>> position. I have a long run between rotor and shack, so I used two 250 ft 
>> runs of 3-conductor house wire from the shack to the tower, and a 130 ft 
>> run of nicer cable that I found at a surplus house to run up the tower. It 
>> works quite well. 
>>
>> 73,
>>
>> Jim K9YC
>>
>>
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