I saw antennas mounted on tower at Phillips 66 refinery in Borger, Texas with rubber sleeve between mount and tower legs. This tower was always getting hit by lightning until they installed that weird system I mentioned once on list with these clear plastic barrels with green looking rock stuff and some kind of charcoal looking material in the trenches where copper wire rested...cover with darker material and dirt....anyways I think the rubber sleeves were an attempt to :"float" the antenna.
Jaime Solorza Wireless Systems Architect 915-861-1390 On Wed, Aug 19, 2015 at 4:05 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? >>>>>>> >>>>>> >>>>>> >>>>> >>>> >>>> >>> >> > >
