You don't lose any voltage until the radios start drawing power, so it generally isn't 100% safe to boost it beyond what the radios are rated for. I'd set the voltage at the bottom to the absolute maximum you know the radios are fine with. Then it can only go down from there.
On Tue, May 15, 2018 at 9:20 AM, Josh Luthman <j...@imaginenetworksllc.com> wrote: > Reason I ask is if at the bottom I believe it's 24v and the top it's 24v. > I'm using that heavy duty coax (inch and a half?) up the tower for my DC. > I think the center conductor was 8mm. > > If you're doing say 27.4v at the bottom and 100' of two pair 24 gauge, > it's more like 26.83v at the top. I'm not losing that ~0.6v. > > I really don't want to fry anything and start replacing radios :( > > > Josh Luthman > Office: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> > Suite 1337 > <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> > Troy, OH 45373 > <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> > > On Tue, May 15, 2018 at 11:15 AM, Forrest Christian (List Account) < > li...@packetflux.com> wrote: > >> The UBNT stuff used to be a lot more sensitive than it is. Anything >> modern should be fine up to 28V on the 24V radios. >> >> On Tue, May 15, 2018 at 7:34 AM, Josh Luthman < >> j...@imaginenetworksllc.com> wrote: >> >>> Sweet! I'll crank up the power supply another volt. IIRC Ubnt stuff >>> dies at 26 or 27 volts, so you can see why I aimed for right at 24v. >>> >>> >>> Josh Luthman >>> Office: 937-552-2340 >>> Direct: 937-552-2343 >>> 1100 Wayne St >>> <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> >>> Suite 1337 >>> <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> >>> Troy, OH 45373 >>> <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> >>> >>> On Sun, May 13, 2018 at 9:21 AM, Josh Baird <joshba...@gmail.com> wrote: >>> >>>> Agreed. I expect your issues will go away if you increase voltage. We >>>> run all ePMP @ 48VDC. It fixed these random rebooting issues for us. >>>> >>>> On Sun, May 13, 2018 at 6:37 AM, Forrest Christian (List Account) < >>>> li...@packetflux.com> wrote: >>>> >>>>> 22.93 is too low. Cambium says 23V is the minimum into the radio. >>>>> See http://community.cambiumnetworks.com/t5/ePMP-Installatio >>>>> n/ePMP-PoE-Powering-Primer/td-p/49944 >>>>> >>>>> You need to subtract a bit of loss inside the injector, and then a bit >>>>> more for cabling. Plus a bit more for everything else. >>>>> >>>>> For verification, I took my bench ePMP and hooked it up to my power >>>>> supply - it doesn't even turn on until 22.5V at the radio. I'm sure >>>>> other >>>>> copies are probably higher or lower. And I'm sure it changes with >>>>> internal temperature of the radio. >>>>> >>>>> One big difference between the PoE Injector and the SyncInjector is >>>>> that the syncinjector uses semiconductor switches which generally have a >>>>> bit more voltage drop than a relay. The tradeoff is that the >>>>> semiconductor >>>>> switches can switch far more power than the relays can and can switch >>>>> quickly enough to do sync over power. >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> On Sat, May 12, 2018 at 10:26 PM, Josh Luthman < >>>>> j...@imaginenetworksllc.com> wrote: >>>>> >>>>>> So we replaced all 8 surge cards. It's getting 22.95 and 22.93 for >>>>>> the two boxes (to the green terminal). Devices are still rebooting... >>>>>> >>>>>> Epmp never has problems with the same DC supply through the green POE >>>>>> injector, forgot to mention that. >>>>>> >>>>>> >>>>>> Josh Luthman >>>>>> Office: 937-552-2340 >>>>>> Direct: 937-552-2343 >>>>>> 1100 Wayne St >>>>>> <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> >>>>>> Suite 1337 >>>>>> <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> >>>>>> Troy, OH 45373 >>>>>> <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> >>>>>> >>>>>> On Sun, May 6, 2018 at 8:14 PM, George Skorup < >>>>>> george.sko...@cbcast.com> wrote: >>>>>> >>>>>>> Funny story if you were using ePMP near the beginning. Some of the >>>>>>> first original 5GHz integrated radios had labels marked 56VDC. They were >>>>>>> definitely NOT capable of being powered from 48/56V. Somebody screwed >>>>>>> up. >>>>>>> >>>>>>> Yeah. We've run Force180/200 survey setups on a small 12V SLA too. >>>>>>> It works, but they're rated at 14 volts. Same with the 100 and 450 SMs. >>>>>>> Still works. However, I recall the regulator is very inefficient down >>>>>>> that >>>>>>> low. Like the old 320 and 430 APs could be run on 24VDC, but you really >>>>>>> didn't want to do that, and Motorola/Cambium said it was completely >>>>>>> unsupported. >>>>>>> >>>>>>> >>>>>>> On 5/6/2018 5:13 PM, Bill Prince wrote: >>>>>>> >>>>>>>> I had a portable 12V battery that I would use for site surveys with >>>>>>>> the old PMP100. I'm pretty sure they would function in the 8-10V >>>>>>>> region. >>>>>>>> >>>>>>>> I know nothing about the ePMP radios. Trust George. >>>>>>>> >>>>>>>> >>>>>>>> bp >>>>>>>> <part15sbs{at}gmail{dot}com> >>>>>>>> >>>>>>>> On 5/6/2018 2:33 PM, George Skorup wrote: >>>>>>>> >>>>>>>>> Original 5GHz integrated and connectorized are 14-30VDC, -4/5 +7/8 >>>>>>>>> only. >>>>>>>>> >>>>>>>> >>>>>>>> >>>>>>> >>>>>> >>>>> >>>>> >>>>> -- >>>>> *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* >>>>> Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 >>>>> <https://maps.google.com/?q=3577+Countryside+Road,+Helena,+MT+59602&entry=gmail&source=g> >>>>> forre...@imach.com | http://www.packetflux.com >>>>> <http://www.linkedin.com/in/fwchristian> >>>>> <http://facebook.com/packetflux> <http://twitter.com/@packetflux> >>>>> >>>>> >>>> >>> >> >> >> -- >> *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* >> Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 >> <https://maps.google.com/?q=3577+Countryside+Road,+Helena,+MT+59602&entry=gmail&source=g> >> forre...@imach.com | http://www.packetflux.com >> <http://www.linkedin.com/in/fwchristian> >> <http://facebook.com/packetflux> <http://twitter.com/@packetflux> >> >> > -- *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 forre...@imach.com | http://www.packetflux.com <http://www.linkedin.com/in/fwchristian> <http://facebook.com/packetflux> <http://twitter.com/@packetflux>
