So, to clarify things. These are Cyclone 2450-VS APs set to 120deg.
That said, the idea with the ground wires for the omni may not work.
A surge arrestor at the top and bottom (not part way up).
Try not to be the tallest thing on the tower.
Aerial at top with dedicated ground wire to ground rod tied into Tower
ground ring.
Does that about sum it up?
-Ed
On 6/3/2015 4:53 PM, Chuck McCown wrote:
I have used them. I believe the theories. But I think you would have
to talk to broadcasters to get a good opinion. They don’t seem to be
as popular as they once were.
*From:* Edward Brooks <mailto:[email protected]>
*Sent:* Wednesday, June 03, 2015 4:51 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [AFMUG] Static & Nearby Lightning Issues
Thanks Ken,
Has anyone had any experience with dissipators? Are they worth
the money and labor?
-Ed
--
Edward Brooks
/Outside Plant Manager
The Montana Internet Corporation/
406-443-3347 X506
On 6/3/2015 4:35 PM, Ken Hohhof wrote:
I would NOT put Cat5 surge protectors every 50-75 feet, you will
likely get Ethernet errors and/or negotiation problems. At most
there should be one at each end.
You are probably thinking of coax, and even so I suspect those are
shield grounds, not actual surge protectors.
I do agree with not making your antennas the highest thing on the
tower if you can help it.
If you must use an omni antenna located at the top, I have had some
success with a COAX surge protector between the radio and the
antenna. Polyphaser makes some DC blocking types that work OK and
aren’t too expensive. If lightning hits, the omni is still probably
toast, but it might save the radio.
*From:* Edward Brooks <mailto:[email protected]>
*Sent:* Wednesday, June 03, 2015 5:24 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* [AFMUG] Static & Nearby Lightning Issues
Here goes...
We have a new 118' Super Titan Max tower that has been grounded
per manufacturers recommendations. Each leg is physically bonded
(not exothermically) to a 10' ground rod, all ground rods are then
connected to each other in a ring. The equipment cabinet is bonded
to an 8' ground rod and tied into the meter base grounding as well.
The two ground rings are then bonded to each other in 2 separate places.
With that said our issue has not been with the grounding, but
with the dissipation of static at the height of the antennas. We
currently have had the worst problems with the 3 Cyclone 2.4 antennas
which are currently located on masts at the top of the tower. We
have also had issues with a couple of the 5.7 Cyclones located below
the top of the tower, but not as frequently. The center-line of the
2.4 APs is 120' AGL, the height of the tower is 118' AGL. We
currently have WB-GigE-APC surge arrestors located in the cabinet
which is located 10 ft from the base of the tower.
After doing some research through various Cambium manuals and
the Motorola R56 manual, I have some idea what our issue is, but
would like to bounce those ideas off the community. My thought is
that we neglected to put surge arrestors at 50' to 75' intervals (as
recommended by the Motorola R56 manual) and 1 at the top for use in
thunderstorm areas. Also we may need to lower the APs to a minimum
of 2ft below the top of the tower (per the Cambium manuals for
various antenna types).
Any suggestions or comments would be appreciated. What have you
done to mitigate this problem? Etc...
Thanks,
-Ed
--
Edward Brooks
/Outside Plant Manager
The Montana Internet Corporation/
406-443-3347 X506
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