We just wired up a Prosistel PST71D Pro model with 300' of cable using Cat 7
cable. Two extra wires doubled up are still less than the size the manual
suggests, so I asked Prosistel and they said it would work. The Pro model uses
a hall effect sensor instead of a pot for heading indication and needs 6
conductors.
When we tested it worked just fine. Not installed on the tower yet.
73/Jon
Jon P. Zaimes, AA1K
Tower climber for hire
Felton, Delaware
http://www.aa1k.us/
Reviews of AA1K tower work on eham website:
http://www.eham.net/reviews/detail/12922
Hug your favorite tower every day, and always stay connected to it.
On Sunday, March 23, 2025 at 02:10:52 PM EDT, Jeff DePolo
<jd0@broadsci.com> wrote:
> > Prosistel recommends Cat7E for the motor conductors? Cat7E uses 23 or
22
> > awg copper wires. I am not familiar with Prosistel rotators and I don't
> > know the motor's voltage or amperage. 22awg wire has 1.6 ohms
resistance
> > per 100 feet so the voltage drop at the motor could be significant.
I think Prosistel recommends shielded Cat7 because they use an encoder for
position tracking; the controller could be susceptible to RFI on those
conductors, thus the requirement for shielding and twist? As far as power
requirements, I don't know, but if you can get away with it, I'd use
something like Essex BBDG6A which is also 23 gauge, is flooded (icky-pic),
has a copper armor shield that you can put ground kits on, and has a very
tough jacket. We use it all the time on towers for Ethernet to microwave
radios. It's good stuff, and not all that expensive in full-reel
quantities.
> Mass market options for multi-conductor cable are pretty limited. I used
> two runs of Romex for most of the 350 ft run to the top of my tower for
> a Yaesu rotator.
For Yaesu we use TC-ER tray cable. Wire And Cable Your Way has good
selection and will cut to any length. For quick and dirty temporary use,
sprinkler wire...
--- Jeff WN3A
---------------------------------
Jeff DePolo, Senior Engineer
Broadcast Sciences LLC
Valley Forge, Pennsylvania
610.917.3000
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