Re: [AFMUG] Mixing +48v and -48v
Hader? My phone tried to autocorrect ...never knew thanks On Aug 20, 2015 8:22 AM, "Lewis Bergman" wrote: > That dark charcoal stuff is ground enhancer. Harder sells it and sometimes > you can find it on bulk in locations where the oil field is prevalent. I > think it is composed of aluminum sulfate and some form of salt. > > I use it on a regular basis as it is a pretty big bang for your buck. The > trench, Cooper and everything is already there > . just put it on top. It is easy to measure the difference it makes > especially after the first big reason once it is dumped in. > > On Wed, Aug 19, 2015, 10:30 PM Jaime Solorza > wrote: > >> 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 dirtanyways 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, wrote: >> >>> Hard to float a radio if it has an antenna mounted to a tower. >>> >>> *From:* Josh Baird >>> *Sent:* Wednesday, August 19, 2015 3:56 PM >>> *To:* af@afmug.com >>> *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 < >>> j.mcke...@veloxinetbroadband.com> 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, wrote: >>>> >>>>> Set it on a cardboard box. (With a sticky note warning not to touch >>>>> case...) >>>>> >>>>> *From:* Jason McKemie >>>>> *Sent:* Wednesday, August 19, 2015 3:11 PM >>>>> *To:* af@afmug.com >>>>> *Subject:* Re: [AFMUG] Mixing +48v and -48v >>>>> >>>>> I'll probably just float the ground. >>>>> >>>>> On Wednesday, August 19, 2015, Josh Baird 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','j.mcke...@veloxinetbroadband.com');> >>>>>> 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','geo...@cbcast.com');> 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? >>>>>>>>> >>>>>>>> >>>>>>>> >>>>>>> >>>>>> >>>>>> >>>>> >>>> >>> >>> >> >>
Re: [AFMUG] Mixing +48v and -48v
That dark charcoal stuff is ground enhancer. Harder sells it and sometimes you can find it on bulk in locations where the oil field is prevalent. I think it is composed of aluminum sulfate and some form of salt. I use it on a regular basis as it is a pretty big bang for your buck. The trench, Cooper and everything is already there . just put it on top. It is easy to measure the difference it makes especially after the first big reason once it is dumped in. On Wed, Aug 19, 2015, 10:30 PM Jaime Solorza wrote: > 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 dirtanyways 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, wrote: > >> Hard to float a radio if it has an antenna mounted to a tower. >> >> *From:* Josh Baird >> *Sent:* Wednesday, August 19, 2015 3:56 PM >> *To:* af@afmug.com >> *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 < >> j.mcke...@veloxinetbroadband.com> 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, wrote: >>> >>>> Set it on a cardboard box. (With a sticky note warning not to touch >>>> case...) >>>> >>>> *From:* Jason McKemie >>>> *Sent:* Wednesday, August 19, 2015 3:11 PM >>>> *To:* af@afmug.com >>>> *Subject:* Re: [AFMUG] Mixing +48v and -48v >>>> >>>> I'll probably just float the ground. >>>> >>>> On Wednesday, August 19, 2015, Josh Baird 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','j.mcke...@veloxinetbroadband.com');> >>>>> 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','geo...@cbcast.com');> 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? >>>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>> >>>>> >>>> >>> >> >> > >
Re: [AFMUG] Mixing +48v and -48v
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 dirtanyways 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, wrote: > Hard to float a radio if it has an antenna mounted to a tower. > > *From:* Josh Baird > *Sent:* Wednesday, August 19, 2015 3:56 PM > *To:* af@afmug.com > *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 < > j.mcke...@veloxinetbroadband.com> 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, wrote: >> >>> Set it on a cardboard box. (With a sticky note warning not to touch >>> case...) >>> >>> *From:* Jason McKemie >>> *Sent:* Wednesday, August 19, 2015 3:11 PM >>> *To:* af@afmug.com >>> *Subject:* Re: [AFMUG] Mixing +48v and -48v >>> >>> I'll probably just float the ground. >>> >>> On Wednesday, August 19, 2015, Josh Baird 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','j.mcke...@veloxinetbroadband.com');> >>>> 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','geo...@cbcast.com');> 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? >>>>>>> >>>>>> >>>>>> >>>>> >>>> >>>> >>> >> > >
Re: [AFMUG] Mixing +48v and -48v
I have also come to the conclusion if deploying anymore -48v radios, each radio will have its own fused DC to DC converter. I really wish Meanwell built a 100 Watt version of the RSD for size purposes and price... Erich Kaiser North Central Tower er...@northcentraltower.com Office: 630-621-4804 Cell: 630-777-9291 On Wed, Aug 19, 2015 at 9:11 PM, Erich Kaiser wrote: > Yep... > > > Erich Kaiser > North Central Tower > er...@northcentraltower.com > Office: 630-621-4804 > Cell: 630-777-9291 > > > On Wed, Aug 19, 2015 at 8:01 PM, George Skorup wrote: > >> Yes, the RSD is isolated in such a way that you can ground the + side of >> the input (from the -48 rectifier) and also ground the - side of the >> output.. nothing bad will happen. The SD series, yeah, don't do that. I >> think it was Erich that said he had to disconnect the SD frame ground >> because he saw a bunch of current being dumped. >> >> On 8/19/2015 7:28 PM, Ken Hohhof wrote: >> >> Personally, I ground one side of every power supply. In this case, you >> would be fine grounding the – OUT of the RSD. >> >> Most DC-DC converters have floating outputs. I have used a Traco TCL >> 060-124 DC to do what you want. If you are going from 24 to 48, there are >> fewer choices. >> >> >> *From:* Jason McKemie >> *Sent:* Wednesday, August 19, 2015 4:11 PM >> *To:* af@afmug.com >> *Subject:* Re: [AFMUG] Mixing +48v and -48v >> >> I'll probably just float the ground. >> >> On Wednesday, August 19, 2015, Josh Baird < >> joshba...@gmail.com> 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','j.mcke...@veloxinetbroadband.com');> 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','geo...@cbcast.com');> 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? >>>>>> >>>>> >>>>> >>>> >>> >>> >> >> >
Re: [AFMUG] Mixing +48v and -48v
Yep... Erich Kaiser North Central Tower er...@northcentraltower.com Office: 630-621-4804 Cell: 630-777-9291 On Wed, Aug 19, 2015 at 8:01 PM, George Skorup wrote: > Yes, the RSD is isolated in such a way that you can ground the + side of > the input (from the -48 rectifier) and also ground the - side of the > output.. nothing bad will happen. The SD series, yeah, don't do that. I > think it was Erich that said he had to disconnect the SD frame ground > because he saw a bunch of current being dumped. > > On 8/19/2015 7:28 PM, Ken Hohhof wrote: > > Personally, I ground one side of every power supply. In this case, you > would be fine grounding the – OUT of the RSD. > > Most DC-DC converters have floating outputs. I have used a Traco TCL > 060-124 DC to do what you want. If you are going from 24 to 48, there are > fewer choices. > > > *From:* Jason McKemie > *Sent:* Wednesday, August 19, 2015 4:11 PM > *To:* af@afmug.com > *Subject:* Re: [AFMUG] Mixing +48v and -48v > > I'll probably just float the ground. > > On Wednesday, August 19, 2015, Josh Baird < > joshba...@gmail.com> 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','j.mcke...@veloxinetbroadband.com');> 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','geo...@cbcast.com');> 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? >>>>> >>>> >>>> >>> >> >> > >
Re: [AFMUG] Mixing +48v and -48v
I did continuity testing on a Meanwell SD series that I have sitting around - the inputs, outputs, and ground all seem to be isolated. Is this a good indicator? On Wednesday, August 19, 2015, Ken Hohhof wrote: > Personally, I ground one side of every power supply. In this case, you > would be fine grounding the – OUT of the RSD. > > Most DC-DC converters have floating outputs. I have used a Traco TCL > 060-124 DC to do what you want. If you are going from 24 to 48, there are > fewer choices. > > > *From:* Jason McKemie > > *Sent:* Wednesday, August 19, 2015 4:11 PM > *To:* af@afmug.com > *Subject:* Re: [AFMUG] Mixing +48v and -48v > > I'll probably just float the ground. > > On Wednesday, August 19, 2015, Josh Baird > 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','j.mcke...@veloxinetbroadband.com');> 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','geo...@cbcast.com');> 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? >>>>> >>>> >>>> >>> >> >> >
Re: [AFMUG] Mixing +48v and -48v
Yes, the RSD is isolated in such a way that you can ground the + side of the input (from the -48 rectifier) and also ground the - side of the output.. nothing bad will happen. The SD series, yeah, don't do that. I think it was Erich that said he had to disconnect the SD frame ground because he saw a bunch of current being dumped. On 8/19/2015 7:28 PM, Ken Hohhof wrote: Personally, I ground one side of every power supply. In this case, you would be fine grounding the – OUT of the RSD. Most DC-DC converters have floating outputs. I have used a Traco TCL 060-124 DC to do what you want. If you are going from 24 to 48, there are fewer choices. *From:* Jason McKemie <mailto:j.mcke...@veloxinetbroadband.com> *Sent:* Wednesday, August 19, 2015 4:11 PM *To:* af@afmug.com <mailto:af@afmug.com> *Subject:* Re: [AFMUG] Mixing +48v and -48v I'll probably just float the ground. On Wednesday, August 19, 2015, Josh Baird <mailto:joshba...@gmail.com>> 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 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 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?
Re: [AFMUG] Mixing +48v and -48v
Personally, I ground one side of every power supply. In this case, you would be fine grounding the – OUT of the RSD. Most DC-DC converters have floating outputs. I have used a Traco TCL 060-124 DC to do what you want. If you are going from 24 to 48, there are fewer choices. From: Jason McKemie Sent: Wednesday, August 19, 2015 4:11 PM To: af@afmug.com Subject: Re: [AFMUG] Mixing +48v and -48v I'll probably just float the ground. On Wednesday, August 19, 2015, Josh Baird 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 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 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?
Re: [AFMUG] Mixing +48v and -48v
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, wrote: > Hard to float a radio if it has an antenna mounted to a tower. > > *From:* Josh Baird > *Sent:* Wednesday, August 19, 2015 3:56 PM > *To:* af@afmug.com > *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 < > j.mcke...@veloxinetbroadband.com> 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, wrote: >> >>> Set it on a cardboard box. (With a sticky note warning not to touch >>> case...) >>> >>> *From:* Jason McKemie >>> *Sent:* Wednesday, August 19, 2015 3:11 PM >>> *To:* af@afmug.com >>> *Subject:* Re: [AFMUG] Mixing +48v and -48v >>> >>> I'll probably just float the ground. >>> >>> On Wednesday, August 19, 2015, Josh Baird 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','j.mcke...@veloxinetbroadband.com');> >>>> 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','geo...@cbcast.com');> 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? >>>>>>> >>>>>> >>>>>> >>>>> >>>> >>>> >>> >> > >
Re: [AFMUG] Mixing +48v and -48v
Hard to float a radio if it has an antenna mounted to a tower. From: Josh Baird Sent: Wednesday, August 19, 2015 3:56 PM To: af@afmug.com 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 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, wrote: Set it on a cardboard box. (With a sticky note warning not to touch case...) From: Jason McKemie Sent: Wednesday, August 19, 2015 3:11 PM To: af@afmug.com Subject: Re: [AFMUG] Mixing +48v and -48v I'll probably just float the ground. On Wednesday, August 19, 2015, Josh Baird 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 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 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?
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 < j.mcke...@veloxinetbroadband.com> 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, wrote: > >> Set it on a cardboard box. (With a sticky note warning not to touch >> case...) >> >> *From:* Jason McKemie >> *Sent:* Wednesday, August 19, 2015 3:11 PM >> *To:* af@afmug.com >> *Subject:* Re: [AFMUG] Mixing +48v and -48v >> >> I'll probably just float the ground. >> >> On Wednesday, August 19, 2015, Josh Baird 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','j.mcke...@veloxinetbroadband.com');> 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','geo...@cbcast.com');> 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? >>>>>> >>>>> >>>>> >>>> >>> >>> >> >
Re: [AFMUG] Mixing +48v and -48v
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, wrote: > Set it on a cardboard box. (With a sticky note warning not to touch > case...) > > *From:* Jason McKemie > *Sent:* Wednesday, August 19, 2015 3:11 PM > *To:* af@afmug.com > *Subject:* Re: [AFMUG] Mixing +48v and -48v > > I'll probably just float the ground. > > On Wednesday, August 19, 2015, Josh Baird 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','j.mcke...@veloxinetbroadband.com');> 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','geo...@cbcast.com');> 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? >>>>> >>>> >>>> >>> >> >> >
Re: [AFMUG] Mixing +48v and -48v
Set it on a cardboard box. (With a sticky note warning not to touch case...) From: Jason McKemie Sent: Wednesday, August 19, 2015 3:11 PM To: af@afmug.com Subject: Re: [AFMUG] Mixing +48v and -48v I'll probably just float the ground. On Wednesday, August 19, 2015, Josh Baird 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 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 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?
Re: [AFMUG] Mixing +48v and -48v
I'll probably just float the ground. On Wednesday, August 19, 2015, Josh Baird 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 < > j.mcke...@veloxinetbroadband.com > > 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 > > 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? >>> >>> >> >
Re: [AFMUG] Mixing +48v and -48v
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 < j.mcke...@veloxinetbroadband.com> 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 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? >>> >> >> >
Re: [AFMUG] Mixing +48v and -48v
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 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? >> > >
Re: [AFMUG] Mixing +48v and -48v
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?
Re: [AFMUG] Mixing +48v and -48v
Sorry RSD is completely isoltaed SD version is not so you should be good if you use RSD. Erich Kaiser North Central Tower er...@northcentraltower.com Office: 630-621-4804 Cell: 630-777-9291 On Tue, Aug 18, 2015 at 7:50 PM, Erich Kaiser wrote: > Make sure you use an RSD not SD dc to dc. > > > Erich Kaiser > North Central Tower > er...@northcentraltower.com > Office: 630-621-4804 > Cell: 630-777-9291 > > > On Tue, Aug 18, 2015 at 7:20 PM, Jason McKemie < > j.mcke...@veloxinetbroadband.com> 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? > > >
Re: [AFMUG] Mixing +48v and -48v
Make sure you use an RSD not SD dc to dc. Erich Kaiser North Central Tower er...@northcentraltower.com Office: 630-621-4804 Cell: 630-777-9291 On Tue, Aug 18, 2015 at 7:20 PM, Jason McKemie < j.mcke...@veloxinetbroadband.com> 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?
[AFMUG] Mixing +48v and -48v
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?
