Yeah, in that case you're not going to have much drop. The only reason I shoot for 27.4v is to match the float voltage on batteries - if you don't have to deal with that, just set it to 26v, or so and you won't need to worry about anything.
On Tue, May 15, 2018 at 10:20 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> >> >> >
