Do you notice any change in pattern of the antenna? That really should influence the pattern I would think. Maybe Chuck will chime in. On Jun 3, 2015 5:33 PM, "Glen Waldrop" <[email protected]> wrote:
> On my first tower we ran a 10ft section of conduit at the top as > lightning rod with a number 4 or 6 copper wire from the ground rod all the > way to the top. > > It is the highest point on my tower. The only time lightning has been an > issue here it hit a tree nearby and came in through the buried cable. > > We also have a piece of copper wire run up the side of each omni sticking > about 3 inches above the top. > > > > ----- Original Message ----- > *From:* Edward Brooks <[email protected]> > *To:* [email protected] > *Sent:* Wednesday, June 03, 2015 5:24 PM > *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 ManagerThe Montana Internet Corporation* > 406-443-3347 X506 > > > ------------------------------ > [image: Avast logo] <https://www.avast.com/antivirus> > > This email has been checked for viruses by Avast antivirus software. > www.avast.com <https://www.avast.com/antivirus> > >
