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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