Not all only the ones that are more West facing on a mt side. The
lightning there can be very impacting.
The ones that have back up gennys do just fine during storms because
most of the time the power is broken due to a fuse or breaker somewhere
down the line.
The others that have no genny and have a battery back up source we will
drop that source if there is approaching storm within 3 mile or less.
Takes about 10-15 min the storm will move out and power can be restored.
On 4/3/20 2:49 PM, Kurt Fankhauser wrote:
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
<mailto: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
<mailto: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>
<mailto: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>
<mailto: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?
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