The Mikrotik thing doesn't appear to be doing anything with voltage, the poe is just a passthrough (and to power it), it's purpose is to extend the ethernet beyond 100 meters... I'm assuming it's basically just a 2 port switch with poe in on one port and out on the other, so you'd want it somewhere in the middle of the cable (I'd put it somewhere around the 300' mark), It's not outdoor rated, but they do sell an IP67 case for it.
You don't want to pump 48v into that, as it would fry the Force 300. Force 300's do have a heater, but I doubt it would be an issue. If I remember correctly, Force 300s will work down to something like 10v, so you can deal with a lot of voltage drop... worst case, you might need a higher current power supply than the standard. On Wed, Sep 1, 2021 at 10:57 AM Steve Jones <thatoneguyst...@gmail.com> wrote: > i dont recall if these have the heater in them like the other epmp. winter > is going to be problem > > I dont understand letting customers do things outside the demarc. I voiced > my opinion and got over ruled, so time will tell. > > A fiber media converter would be the bees knees, solve a bunch of issues. > but why make sense when we can cobblefuck, right? > > On Wed, Sep 1, 2021 at 10:48 AM Chuck McCown via AF <af@af.afmug.com> > wrote: > >> The POE inserter is indoors only rated. If you wanted to make sure the >> radio has full voltage you would want to put this device out by the radio. >> >> I fully agree with you, put the cambium PSU as far down the line as you >> can. >> >> You are probably using at least 4 if not all 8 wires for the POE. So you >> have 4 wires down and 4 wires back. That is 1/4the the voltage drop. If >> you have one down, with 10 volts drop, then another 10 volts for the return >> wire. You gotta calculate full loop length not just one way for the loop >> resistance. >> >> 800’ loop has 20 volts of overall drop at .5 amp. But 4 of them in >> parallel has 10 ohms with 5 volts drop. >> >> *From:* Steve Jones >> *Sent:* Wednesday, September 1, 2021 9:16 AM >> *To:* AnimalFarm Microwave Users Group >> *Subject:* [AFMUG] resistivity of cat5 >> >> I have a customer fixed on using >> https://i.mt.lv/cdn/product_files/GPeRqg_190928.pdf to extend his epmp >> f300 radio run to 400+ feet. >> if im calculating this right there will be about a 10v drop on the >> 24guage cat5, taking the 30v down to 20. If it does manage to keep the >> radio powered i see it burning out the poe circuit. >> >> hes fighting me on putting the cambium PSU at the midspan point and using >> his own POE to power the extender. >> >> Ive been overruled about telling the customer no, so its happening, but I >> want to make sure my math is correct >> using https://www.rapidtables.com/calc/wire/voltage-drop-calculator.html >> 24guage, 30v, .5 amp, 400 feet shows 10v drop. but im not sure about the >> resistivity field >> >> this is a guy who runs constant latency monitoring and initiates tickets >> on every blip, so i see this radio move just becoming a nightmare with this >> midspan extender in play >> >> ------------------------------ >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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