For he 220’ run to my Tic Ring I use 7 conductor 18 ga copper underground
sprinkler wire I bought at Menards. 2 pairs for the 2 motors & 3 for the
pot. Runs to base of tower & then stranded 18 ga up the tower. Tower is a
HDX-555, so need strand going up.
73 Herschel
WA9KIA
On Mon, Mar 24, 2025 at 7:41 AM Jorge Diez - CX6VM <cx6vm.jorge@gmail.com>
wrote:
> 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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