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> *On Behalf Of *Josh Baird
*Sent:* Thursday, April 2, 2020 7:55 PM
*To:* AnimalFarm Microwave Users Group <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
--
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com
