Great! Thanks! So let me make sure I'm clear on this. I'll connect my +48v gear directly to the AD-155C. Then, put the RSD-200C in-line between the AD-155C and the -48v gear. Is this right?

Craig


Quoting George Skorup <geo...@cbcast.com>:

Yup. Just use a RSD200C-48 and not worry about it.

On 1/5/2016 12:51 PM, Josh Baird wrote:
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 <mailto: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








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