The AF-24 and AF-24HD WILL support -48VDC since its supply is isolated. AF-5(not X the large full duplex radio) also will support -48VDC.
AF-5X, AF-4X, AF-3X, AF-2X and AF-11FX WILL NOT ACCEPT -48VDC (positive on Earth/chassis/tower ground) AT ALL! If an “X” radio has been powered by -48VDC with respect to case (tower ground) it will surely be damaged! Regards, Alex > On Jun 28, 2017, at 6:30 PM, Kristian Hoffmann <[email protected]> wrote: > > Can someone from Ubnt answer this question? I'm getting yes, no, and maybe > in even numbers. To complicate matters, I did actually power one up with > -48V and it didn't explode. And that wasn't on a bench, isolated from > ground. That's on a metal tower with other -48V non-isolated radios. > > Thanks, > > -Kristian > >> On 06/27/2017 11:47 AM, Kristian Hoffmann wrote: >> I'm reading that as "yes, you can power it with -48VDC." >> >> Thanks, >> >> -Kristian >> >>> On 06/27/2017 11:00 AM, [email protected] wrote: >>> Input 48v is transformer isolated, individual on-board voltage converters >>> have DC negative directly coupled to chassis ground. >>> >>> AF24 reads 0 ohms from board DC- (also digital ground) to chassis plate, >>> “no” path between input DC- and chassis plate. >>> >>> 24HD shares the same PCB, so the same applies for that. >>> >>> From: Kristian Hoffmann >>> Sent: Tuesday, June 27, 2017 1:52 PM >>> To: Ubiquiti Users Group >>> >>> Hi, >>> >>> Is the AF24's internal power supply isolated in such a way that it can >>> be powered with -48VDC, like other telco equipment with a positive >>> ground, or will this cause a short when mixed with other -48VDC >>> equipment on the same ground plane? >>> >>> Thanks, >>> >>> -- >>> Kristian Hoffmann >>> Fire2Wire >>> [email protected] >>> http://www.fire2wire.com >>> >>> Office - 209-543-1800 | Fax - 209-545-1469 | Toll Free - 800-905-FIRE >>> >>> _______________________________________________ >>> Ubnt_users mailing list >>> [email protected] >>> http://lists.wispa.org/mailman/listinfo/ubnt_users >>> >>> >>> _______________________________________________ >>> Ubnt_users mailing list >>> [email protected] >>> http://lists.wispa.org/mailman/listinfo/ubnt_users >> >> >> >> _______________________________________________ >> Ubnt_users mailing list >> [email protected] >> http://lists.wispa.org/mailman/listinfo/ubnt_users > > _______________________________________________ > Ubnt_users mailing list > [email protected] > http://lists.wispa.org/mailman/listinfo/ubnt_users
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