The calculator at https://www.calculator.net/voltage-drop-calculator.html , second tab, has worked quite well for me. E.g. a Cambium 4625 CPE (15W) plus a SFP to copper converter (5W), so 20W total. With a 55V supply, at 700ft thatwould require 22 AWG cable to keep a suitable (>42V on most 48V devices) voltage at the end, delivering 43.7V at 0.5A so 22W. I would use 20AWG or preferably 18AWG to be safe, the latter would just have a voltage drop of 5V on that cablrle for a 0.5A load.
There are other fiber to copper conversion options, MikroTik RBFTC11 or powerbox, or you can use the Cambium Force 4600C radio that has the built-in SFP. On Fri, Nov 7, 2025, 2:12 p.m. Dev <[email protected]> wrote: > Actually, I’d prefer fiber, maybe run a netonix over there with a SFP. It > makes my head hurt figuring out the voltage drop with wire that’s smaller > than my leg though. > > > On Nov 7, 2025, at 12:05 PM, Ken Hohhof <[email protected]> wrote: > > > > Maybe a dumb question, but why not DC + fiber? Just need adequate gauge > wire and with fiber you don't have to worry about exceeding 100 meters on > copper. > > > > Or are you stuck with a radio model that doesn't support SFP and DC > power? > > > > -----Original Message----- > > From: AF <[email protected]> On Behalf Of Dev > > Sent: Friday, November 7, 2025 2:00 PM > > To: [email protected] > > Subject: [AFMUG] PoE out to 650 feet? > > > > I know you can get away with it out a little past 300 feet, but is there > some kind of powered booster that can get you out to 600-700 feet with 48 > volt power to run a cambium 6GHz radio? This is a DC site, so no power at > the other end of the 650 feet. > > -- > > AF mailing list > > [email protected] > > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > > > > > > -- > > AF mailing list > > [email protected] > > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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