Dave, You power all your DC sites down during lightning storms?
On Fri, Apr 3, 2020 at 3:40 PM Josh Baird <joshba...@gmail.com> wrote: > What are you using for DC surge suppression at the top and bottom? > > On Fri, Apr 3, 2020 at 3:23 PM dave via AF <af@af.afmug.com> wrote: > >> >> We dont do batteries for our larger sites that have 4 or more of these we >> have mostly 3Ghz medusas. >> Its Genny or nothing. Until I can get a perfected lightning detector for >> an all battery backup site I just dont do it anymore. >> Its too risky for continuous run during a lightning storm. Too many dc >> factors to cause overload or damage. >> You may get away with doing 10awg for 2. I just know for 6 I had have a >> minimal of 8awg which included 4 450m 3Ghz and 2 450m 5Ghz >> We ran all the cables into a tower top enclosure which included a >> hardened switch and packetflux rack injector for timing using dinrails and >> buss bar >> to keep everything in order and some din rail mounted lugs to distribute >> power and fuse buss we also installed a transtector 48v dc arrestor top and >> bottom for >> the main line protection. We also included all Lpus for each medusa for >> both Dc line and ethernet. >> >> The site has been in play for a while now with out issue. >> >> Hope this will help others trying to deploy these big guys. >> Using the large riser wire 8awg is not over kill for the medusa at all >> just do some simple surge protection top and bottom and everything should >> be fine. >> I mean I think about how we just spent $$$$$ on a single medusa why not >> give it what it needs to perform and sustain. >> >> Plus if you ever expand the site with other gear it needs power too. >> >> >> >> On 4/2/20 9:24 PM, Ken Hohhof wrote: >> >> Agreed. And I think actual power consumption is closer to 65 or 70W. >> Maybe the 80W number is at startup or extremes of temperature or something. >> >> >> >> I have 2 of them on one tower and 1 on another powered via POE over >> cables right at the 100 meter limit, so >300 feet. So they are powered >> over 4 x 24AWG wires in parallel. 2 in parallel is equivalent to 3 wire >> gauges, 4 in parallel is equivalent to 6 wire gauges. So 4 x 24 AWG is >> equivalent to 1 x 18 AWG. So nothing even close to 12 AWG much less 8 AWG >> is needed. >> >> >> >> Oh, and spec sheet says input voltage range is 40-60 volts. >> >> >> >> 3 GHz version is a beast and the power consumption scares me. That’s a >> lot of batteries. >> >> >> >> >> >> *From:* AF <af-boun...@af.afmug.com> <af-boun...@af.afmug.com> *On >> Behalf Of *Josh Baird >> *Sent:* Thursday, April 2, 2020 7:55 PM >> *To:* AnimalFarm Microwave Users Group <af@af.afmug.com> >> <af@af.afmug.com> >> *Subject:* Re: [AFMUG] Fiber Up Tower >> >> >> >> I'm not following these requirements for the 450M. >> >> >> >> The 450M @ 5ghz uses ~80W peak (if you aren't using the AUX port). This >> is about 1.6A @ 48V. >> >> >> >> 12AWG cable with 56V at 250ft has a voltage drop of ~2.8% resulting in >> 54.5V at the top of the tower. The 450M should run just fine at 54.5V >> according to the spec sheet. >> >> >> >> Obviously, the 3ghz 450M requires much more power, but still should be >> fine using 12AWG @ 250ft. >> >> >> >> What am I missing? >> >> >> >> On Mon, Mar 30, 2020 at 6:24 PM dave via AF <af@af.afmug.com> wrote: >> >> That may work for most radios limited by 4 possibly 6 450i or something >> equivalent. >> If running medusa 3.65 and 5.7 radios youll need #8 min by 2 pair pvc >> jacket or better for outdoor operation. >> We have a few like this and learned the hard way even with #10 hybrid >> cable that would not fly due to the loss in the wire at 250' >> We use Tactical SM fiber LC-LC pre-terminated >> We also use Duracomms >> https://duracomm.com/product-category/rack-mount-power-supplies/centri-series-he1u-mu/ >> Note we use the 50Amp version of this. >> Youll need most of it to get to the top to sustain that 48vDC those beast >> need lol. >> We now have our 3rd site up with Fiber going to everything and #8 >> stranded pairs up the tower for power. >> Also, be sure and add in the surge stuff. >> >> >> On 3/30/20 4:46 PM, TJ Trout wrote: >> >> I've been thinking of offering hybrid fiber / 12 awg copper >> pre-terminated cables... if anyone has a desire for such a thing, let me >> know the fiber count, connector type and lengths you would want... >> >> >> >> On Mon, Mar 30, 2020 at 2:35 PM Matt <matt.mailingli...@gmail.com> wrote: >> >> What is everyone using for fiber up tower? What using for connectors? >> >> >> >> -- >> 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 >> > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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