Also keep in mind that the camera as well as any wireless Ethernet equipment
will generate copious amounts of EMI/RFI right near your antenna thanks to
internal switching power supplies. Plan to implement a lot of filtering and
shielding to quiet the trash to tolerable levels...
-Doug
W6DSR
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@xxxxxxxxxxxxxx] On Behalf Of
jimlux
Sent: Sunday, May 28, 2017 07:38 AM
To: towertalk@xxxxxxxxxxxxxx
Subject: Re: [TowerTalk] Ethernet grounding on tower?
On 5/28/17 7:30 AM, John McCormick via TowerTalk wrote:
> I'm toying with the idea of putting a Power over Ethernet camera at
> the top of my tower, but don't want to defeat all the grounding work
> that I've done and provide an easy path into the house via the
> Ethernet. Most of the lightning/surge gear I've seen for Ethernet
> looks pretty light-weight and for indoor use. Ideally, I'd want to
> provide a path to ground at the base of the tower, as I do for all the
> coaxes, as well as a lightning protector in the enclosure box that I
> have on the side of the house (filled with PolyPhasers). This probably
> is a bad idea and I won't go forward with it, but thought I would
> check to see if anyone on this list has experience doing this and if
> there is an economical solution out there. Thanks and 73, John/K9KE
Check out places like L-com, which have myriad things for cabling and such.
You're going to wind up with something that has a gas gap or thyrector to
ground. Ethernet is galvanically isolated, so the key is in keeping the
voltages reasonable while getting the current to ground.
That said, my strategy today would be to use a dedicated WiFi link - if your
DC power going up the tower blows up, that's cheap to fix, and it's easy to
arrange it to be sufficiently physically separate from the network stuff.
You can get an inexpensive Wireless access point, some provide PoE to a
camera, for the tower top.
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