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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