Sorry, this radio has an indoor modem, but yeah, I suppose it's still grounded to the tower through the LMR that runs to the ODU.
On Wed, Aug 19, 2015 at 6:05 PM, <[email protected]> wrote: > Hard to float a radio if it has an antenna mounted to a tower. > > *From:* Josh Baird <[email protected]> > *Sent:* Wednesday, August 19, 2015 3:56 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Mixing +48v and -48v > > I'm about to do the exact opposite - convert +48V to -48V to power a > radio. I have an RSD in between. Should I take extra care to ensure that > the RSD does not touch the metal enclosure in any way? I was also planning > on floating the radio's ground (and the RSD). > > On Wed, Aug 19, 2015 at 5:32 PM, Jason McKemie < > [email protected]> wrote: > >> Good point, the damn thing is mounted to the same rack as the -48v unit >> right now. I believe the -48v unit is isolated from the rack, but I had >> better make sure before I switch the Mikrotik over to DC power. >> >> -Jason >> >> On Wed, Aug 19, 2015 at 4:22 PM, <[email protected]> wrote: >> >>> Set it on a cardboard box. (With a sticky note warning not to touch >>> case...) >>> >>> *From:* Jason McKemie <[email protected]> >>> *Sent:* Wednesday, August 19, 2015 3:11 PM >>> *To:* [email protected] >>> *Subject:* Re: [AFMUG] Mixing +48v and -48v >>> >>> I'll probably just float the ground. >>> >>> On Wednesday, August 19, 2015, Josh Baird <[email protected]> wrote: >>> >>>> They are hard to find. Where will you ground the MT in this type of >>>> scenario (with an RSD in between your -48V rectifier and MT)? >>>> >>>> Josh >>>> >>>> On Tue, Aug 18, 2015 at 11:31 PM, Jason McKemie < >>>> javascript:_e(%7B%7D,'cvml','[email protected]');> >>>> wrote: >>>> >>>>> It actually looks like the RSD-100C-24 should do the trick (I'm >>>>> dropping to 24v, so I guess my subject line wasn't exactly correct). My >>>>> normal source is out of those, according to their website they have some >>>>> RSD-200C-48 units though. >>>>> >>>>> On Tue, Aug 18, 2015 at 7:58 PM, George Skorup < >>>>> javascript:_e(%7B%7D,'cvml','[email protected]');> wrote: >>>>> >>>>>> The Mean Well RSD gives 4kV i/o isolation and will work perfectly >>>>>> this, no grounding issues. I think the smallest you can get in 48/48 is >>>>>> 200W, the RSD-200C-48. Good luck finding some. >>>>>> >>>>>> >>>>>> On 8/18/2015 7:20 PM, Jason McKemie wrote: >>>>>> >>>>>>> I'm wanting to power a mikrotik switch off of a -48v rectifier setup >>>>>>> that already has some -48v equipment running on it. I'll be using a >>>>>>> Meanwell DC/DC converter, which appears to not bond anything with the >>>>>>> ground. The mikrotik, however, does bond the negative with ground. Do I >>>>>>> need to keep the mikrotik's ground isolated from the main ground? Or is >>>>>>> the >>>>>>> DC/DC converter going to keep things from going boom? >>>>>>> >>>>>> >>>>>> >>>>> >>>> >>>> >>> >> > >
