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Re: [TowerTalk] 5 x conductor rotor cable ?

Subject: Re: [TowerTalk] 5 x conductor rotor cable ?
From: Jim Brown <>
Date: Mon, 25 Oct 2010 09:58:45 -0700
List-post: <">>
On 10/25/2010 7:16 AM, Jim Thomson wrote:
> Who makes  5 x conductor rotor cable ?

Cables designed for communications and control functions like this are 
generally pretty expensive, I suspect because they are made in 
relatively small quantities.

This is nothing more than an Ohm's law problem combined with the cost of 
the cable. When I needed a 350 run from my shack to my Yaesu rotor, I 
used two runs of 3-conductor power cable from the shack to the base of 
the tower (250 ft), and then found some surplus 8-conductor #18 to go 
120 ft up the tower to the rotor.  In that multi-conductor cable, I 
doubled up on the pairs going to the motor.

Yes, someday the outer PVC jacket of the power cable will rot, but it's 
on the ground and easy to pull in, and the multi-pair inside the tower 
is protected, sees little UV, and has a much better quality jacket.

In your situation, I would first study what the sensing circuit is. In 
the Yaesu rotors, it's nothing more than a 500 ohm pot with DC on it, 
and the position indicator in the rotor senses that DC.  One end of the 
pot is connected to the rotor chassis and to the controller chassis, the 
other two conductors go to the top of the pot and the tap. A more 
sophisticated controller with a digital readout might still be sensing 
that DC. If you think RFI might be an issue, run shielded twisted pair 
for that circuit.

73, Jim K9YC

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