Wanted to circle back on this with results. Bought a 100' section of metal
lined LiquidTight at Home Depot (3/4" since I only needed 2 cables). The
100' section was exactly the right length to get from the antennas all the
way to my cabinet in the machine room so now the cables are protected in
the cable trays down below as well.
Used hose clamps to attach the conduit to the tower every ~6 feet. Since I
had to make 2 90 degree turns on the way down, the flexible conduit was
great. I did pull my two Ethernet wires through the conduit while it was
on the ground - figured that would be much easier - and it was. Cable is
Ubiquiti Carrier Shielded (the double shielded version). I also added the
ends with the grounding cable and grounded both the top and the bottom of
the Ethernet to a good ground.
Been up for about two weeks now with no Ethernet issues at all. Did not put
Ferrites on these two cables like all the rest of mine have. I still get
an occasional Ethernet packet drop or error on the Ferrited cables. So far,
solid on the two cables in the LiquidTight.
Yes, fiber is still a better long term solution but this was fairly
inexpensive and quick and is working great. Thanks for the suggestion.
On Fri, Sep 9, 2016 at 10:51 AM, Sean Heskett <af...@zirkel.us> wrote:
> my bad, i was answering late in the evening, i was thinking PVC when you
> said EMT. EMT will work too since it's metal but it's hard to work with on
> a tower. the 3/4" liquidtight that you linked to will fit 3 cables. we
> usually run 1 1/2" or 1 3/4" (i can't remember which at the moment) and you
> can fit 13 cables in it. we run it up to a box on the tower and then use
> 3/4" to run from the box to the individual APs or backhauls. we run the
> conduit first and then drop the ethernet cables down from the top.
> On Thu, Sep 8, 2016 at 11:17 PM, Chadwick Wachs <c...@auwireless.net>
>> Interesting... Certainly easier to run. Because I have to make two 90
>> degree turns (damn "H" shaped tower), I think I'll pull my Ethernet through
>> it on the ground and then run it up the tower with cable in it. I'm
>> guessing that cutting it and putting 90 degree elbows (with cable pull
>> windows) on it is a bad idea from an RF standpoint?
>> My local HD has this in stock:
>> That looks what you describe.
>> I have to ask - from a physics(?) standpoint, what keeps RF out of the
>> Liquidtight but not EMT?
>> On Thu, Sep 8, 2016 at 10:46 PM, Sean Heskett <af...@zirkel.us> wrote:
>>> If you do conduit you need to use liquidtight with the metal inside.
>>> EMT will do nothing to stop the RF from bleeding.
>>> We've done it on several towers with great success.
>>> On Thursday, September 8, 2016, Chadwick Wachs <c...@auwireless.net>
>>>> With two new FM stations moving onto the tower I am on, I need to solve
>>>> the FM noise problem once and for all. I've been using Ferrites on each
>>>> end of the Ethernet cable and its been pretty successful but I need to add
>>>> a couple more antennas so I am considering conduit.
>>>> This is not my area of expertise but from what I read, it sounds like
>>>> running conduit up the tower (only 75' for my antennas) is the best long
>>>> term solution? My plan was to buy some 3/4" EMT in 10' sections and clamp
>>>> it to the tower from bottom to top and run my shielded cables inside of
>>>> Is that the route to go? I am guessing I want to keep my service loops
>>>> at the top of the conduit pretty short or I negate what I just did. I do
>>>> have longer loops at the bottom in the building so my Ethernet cables are
>>>> longer than my antenna ground wires. I'm planning on not putting Ferrites
>>>> on the cables that are in the conduit.
>>>> Tower has 5 FM stations on it, a 900mhz paging company and two UHF DTV
>>>> stations - along with some other 5 Ghz stuff. The FM stations are "lower"
>>>> power (250 - 400 watts) but it sounds like those are the culprit for
>>>> Ethernet issues (other than AM which is no where near this tower).
>>>> Thanks for the advice.
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