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
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