OK, I don’t think everyone followed that you were talking about DC power for up to 6 450m sectors. Especially with the talk about hybrid cable.
From: AF <af-boun...@af.afmug.com> On Behalf Of dave via AF Sent: Friday, April 3, 2020 2:22 PM To: af@af.afmug.com Cc: dave <dmilho...@wletc.com> Subject: Re: [AFMUG] Fiber Up Tower 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 <mailto: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 <mailto: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 <mailto: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 <mailto:matt.mailingli...@gmail.com> > wrote: What is everyone using for fiber up tower? What using for connectors? -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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