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 >
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