You need an isolated DC-DC converter between your +48V and -48V. Look into the Meanwell RSD series (not the SD).
Specifically, take a look at the RSD-200C. On Tue, Jan 5, 2016 at 1:47 PM, Craig Baird <cr...@xpressweb.com> wrote: > I have a terrible time wrapping my head around -48vdc. I'm hoping you > guys can help. I've got a Cambium PTP820S that I'm going to be putting on > the same tower with several Mimosa B5s. The 820S is apparently -48vdc, > while it appears the Mimosa is +48vdc. I'd like to power both with a > Meanwell AD-155C with a 48v battery string. So... what are my implications > here? Will having both -48 and +48 radios on the same tower, coming from > the same power supply end up shorting through the tower? What's the best > way to do this short of using two separate power supplies and battery > strings? > > Thanks! > > Craig > > >
