I’m confused – 4 pairs is 8 wires. There was mention made of using Cat7 which
is also 4 pairs/8 wires, but doubling up on some of them, presumably for
higher-current motor power. What am I missing here?
--- Jeff WN3A
From: Jorge Diez - CX6VM <cx6vm.jorge@gmail.com>
Sent: Sunday, March 23, 2025 3:53 PM
To: Jeff DePolo <jd0@broadsci.com>
Cc: jim@audiosystemsgroup.com; towertalk@contesting.com
Subject: Re: [TowerTalk] Prosistel rotor connectors source in USA
Hello Jeff
but this Essex BBDG6A cable seems to be 4 pairs, we need 5 wires for Prosistel
73,
Jorge
El dom, 23 mar 2025 a las 15:11, Jeff DePolo (<jd0@broadsci.com
<mailto:jd0@broadsci.com> >) escribió:
> > 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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--
73,
Jorge
CX6VM/CW5W
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