[TowerTalk] Fwd: Prosistel rotor connectors source in USA

[David Gilbert]

All true.  The only Prosistel rotator I know of that uses a Hall Effect 
digital sensor is the big one ... the PST-110D-Pro.  As far as I know 
all others use a potentiometer, which is DC at low current.

Dave   AB7E



On 3/23/2025 10:21 PM, Jim Brown wrote:
> On 3/23/2025 5:30 PM, Jorge Diez (CX6VM-CW5W) wrote:
>> Manual says to use no less than 0.75 mm2 wires. Don’t talk about the 
>> length
>
> In the Yaesu rotators I use, big copper is needed only to run the 
> motor; position is sensed by the position of a potentiometer (variable 
> resistor) physically linked to the rotating side, so small copper 
> works just fine.
>
> I'm looking at the user manual for the PST-61 and two other models, 
> and it does the same thing. Wires 1 and 2 drive the 12VDC motor, wires 
> 3, 4, and 5 are connected to the potentiometer. They specify 1 sq mm 
> for the motor, 0.5 sq mm for the other three. Those numbers seem to be 
> based on current-carrying capacity, not allowable IR drop.
>
> Obviously incomplete information if you're buying cable for a long run.
>
> A question for you, Jorge. How long is your rotator cable? If it's 
> short, you only need to double up the wires on the motor, so that's 
> one pair for each wire. You've got two pairs (4 wires) left for the 
> pot, and only need three.
>
> A trick I've used when trying to fit stranded wire into a contact that 
> is too small for it is to simply remove enough strands right at the 
> connector to make it fit. For you doubling up conductors, strip them a 
> bit long, cut one shorter than the other, solder it to the longer one, 
> and solder that longer one to the connector, using short pieces of 
> heat shrink to insulate the bare wires as needed.
>
> 73, Jim K9YC
>
>
>
>
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