Hi Jim
my cable runs are 650 fts the longest, 300 fts the other two runs
I was using 2.00 mm2 and 1.5 mm2 with no problem
73,
Jorge
El lun, 24 mar 2025 a las 2:21, Jim Brown (<jim@audiosystemsgroup.com>)
escribió:
> 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
>
>
>
>
--
73,
Jorge
CX6VM/CW5W
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