+1
From: George Skorup
Sent: Monday, November 16, 2015 3:38 PM
To: af@afmug.com
Subject: Re: [AFMUG] DC question
To answer your specific question about using the third wire as the return for
both the +24 and +48, yes, it will work. No different than single-point
grounding. It's really going to depend on the current required for both systems
if that single third wire will be able to handle the 0V return current. But I
would agree with everyone else, just run 48/56 up and use DC-DC converters as
needed.
On 11/16/2015 3:28 PM, Mathew Howard wrote:
Yeah, running 48v to the top and then dropping to 24v is what I was planning
on doing, but I just got to wondering if the other way would work... the only
real advantage being less electronics at the top.
On Mon, Nov 16, 2015 at 3:20 PM, Justin Wilson - MTIN <li...@mtin.net> wrote:
+1 to this. It’s not the volts you have to worry about it’s the amp drop.
DC doesn’t lose much voltage over even a 1000 foot run of 12 gauge. What
happens is the wire is not heavy enough to carry the needed amps. There are
some calculators that say how many amps a certain gauge of wire can carry at
such and such voltage on DC. Most folks we work with are running 10 gauge wire
up the tower in these cases.
Justin Wilson
j...@mtin.net
---
http://www.mtin.net Owner/CEO
xISP Solutions- Consulting – Data Centers - Bandwidth
http://www.midwest-ix.com COO/Chairman
Internet Exchange - Peering - Distributed Fabric
On Nov 16, 2015, at 4:16 PM, Vince West <vi...@shelbybb.com> wrote:
I would recommend using 48v up and down converting to 24v. Depending on
how far you are running it, I would recommend doing 48v also to prevent voltage
drop.
I am not sure you can even do waht you are asking if you are using
something like 16-3 service cord. That goes beyond my knowledge. I would
personally down convert to power two different pieces of equipment.
Vince West
Tower Hand
Technical Support
Shelby Broadband
148 Citizens Blvd
Simpsonville, KY 40067
Phone: 1-888-364-4232
On Mon, Nov 16, 2015 at 4:07 PM, Mathew Howard <mhoward...@gmail.com>
wrote:
If I have a three conductor cable running up a tower, would it be a
work, or be a bad idea, to run both 24v and 48v through the same cable and use
the third conductor for the return on both?
