For power we've been running a pair of 16ga conductors up. You can get
16/2 + shield with a heavy outdoor jacket from multiple vendors.
Superior Essex sells stuff that's intended for towers. You can also
find outdoor speaker wire which is cheaper and has similar specs. If
you're running new cables anyway, what's one more?
I've been using pre-terminated fiber up the tower. Mostly because I
don't want the tower guy to have to splice. The tower guys don't
usually have that in their skill set anyway, and if the cable or
connector broke I'm just as happy to have them pull up a new
pre-terminated cable as to try and splice up in the sky. With the
pre-terminated cable I had to special request a very short
breakout.....these days I might do the breakout myself.
So far, the radio products we've used didn't have enough length in the
cable gland to accommodate the length of the LC connectors or the
breakout. So the solution has been to remove the cable gland and thread
in a short (6" or so) length of conduit with a male threaded adapter on
one end and a female threaded adapter on the other end. Male adapter
goes into radio where the cable gland was, original cable gland goes
into the female adapter. Then you have enough space for fiber
connectors and a short breakout. The only catch was some radios (Telrad
for one) had metric threads on the cable gland, so we had to get a
metric to NPT adapter in order to use locally available conduit parts.
For cable lengths we were getting 100' and 200' and we have spares of
each. We end up with lots of slack, but I don't see that as a bad
thing.
------ Original Message ------
From: [email protected]
To: [email protected]
Sent: 12/15/2017 12:26:37 PM
Subject: Re: [AFMUG] fiber/power on POPs
Well, you need to convey 105/48=2.187 amps.
24 gauge is 2.5 ohms per 100 feet. If you used 4 wires for one
polarity and 4 wires for the other polarity, you would have .625 ohms
per polarity or 1.25 ohms per loop/100 ft.
So 1.25 * 1.2 = 1.5 ohms for the 120 foot loop.
1.5 * 2.187 = 3.28 volt drop. And since you will really be running it
of of 54 volts if a battery is involved, you have even less current and
more voltage overhead. If the equipment will run at 44 volts you are
golden. I think you are golden.
Yes, it is pretty sure to work. If not, use all the conductors on one
cable for one polarity and all the conductors of the other cable for
the other polarity.
From:Steve Jones
Sent: Friday, December 15, 2017 9:52 AM
To:[email protected]
Subject: [AFMUG] fiber/power on POPs
We are putting our first fiber to the radio, I have no clue the
components. It appears this link will have 4 LC connectors on single
fiber.
Theres a conduit kit for the radio, looks like 2 to each radio in 2+0
if im understanding correctly. I figure we will need an enclosure at
the top for these to enter to let the fiber pairs split out.
The two big questions are
Can I get this cable in pre terminated patch cords affordably and just
cut the jacket back to get the pairs to the radios.
If its preterminated without running big pipe, conduit is kind of out
so is just something copper clad similar to BBDGE recommended?
Neither of these are more than 120 feet
Our guy can splice at 70 bucks per, but im not sure how viable that is
in the air (these are grain elevators though)
Both these radios have existing cat5 BBDGE, can I use that to run about
105 watts @ 48volts split out to two radios at 120 feet?
Im pretty excited to not have ethernet negotiation issues or surges
