I’m a fan of ground or near-ground mounting. We use the Cisco outdoor AP’s, and place them in planters and other areas where they disappear into landscape. Occasionally we’ll mount them below the cameras on a security pole.
Jeff From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> On Behalf Of John Turner Sent: Friday, August 28, 2020 6:39 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Antenna mounting suggestions I did this back in the mid 2K time frame. I can tell you it was a disaster. Mounting AP’s up high causes issues in far away places. We would have users on the 4 th floor connecting to AP’s mounted on the roof of a building 150’ away. Second with the trees you are suggesting are there they will suck up the RF quickly. Do you have any blue lights on the quad? Those are great locations. Alternatively at the ground level can you penetrate next to a fire standpipe or environmental sensor with a patch antenna? You are going to spend a lot of time and money mounting them on the roof plus the service issues down the road for limited benefit. On Fri, Aug 28, 2020 at 5:47 PM Enfield, Chuck <cae...@psu.edu<mailto:cae...@psu.edu>> wrote: PS – I also recommend bonding the AP and mount to the main conductor for the lightening protection system (LPS). Without equalizing the potential a strike may arc from the grounding conductor of the LPS to your wireless gear which (if you’re doing it right) will have its own ground. Without bonding you can expect very different potentials during a strike, and when that close together arcing is likely. From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> On Behalf Of Enfield, Chuck Sent: Friday, August 28, 2020 5:29 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: Re: [WIRELESS-LAN] Antenna mounting suggestions The library is an excellent candidate for a non-penetrating roof mount. If you google it you’ll find many options. Don’t get crazy with the size or you’ll have to have a structure engineer make sure the roof can handle the spot loading. I did the wind load calculations and I think a 100MPH wind could result in 23lb of lateral load on an AP-375, so there’s no need for tons of ballast. Also, put a pad of some sort (usually available where you order your mount) between the mount and the antenna to project the roof membrane. For Building 2, if you’re trying to cover that smallish space between the buildings I’d definitely recommend wall-mounted panel antennas. Put the AP above the ceiling inside, drill a ¾” hole in the wall, and mount an ant-35 (or something similar) flat to the wall outside. If you paint it to blend in with the brick it will almost disappear. From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> On Behalf Of Brian Helman Sent: Friday, August 28, 2020 3:50 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: [WIRELESS-LAN] Antenna mounting suggestions Hey everyone: I hope you’re coping with the chaos and enrollment challenges. So we’re rolling out a major wireless upgrade using Aruba gear. A part of this rollout is to provide wireless coverage to a few outdoor spaces. One of these spaces is a quad flanked by 2 relatively tall buildings (about 6 stories). One of those buildings has a flat roof with no knee wall or parapet. The other has a parapet that has glass on the outside. Both are rubber-membrane roofs, so mechanical attachment isn’t going to fly. The building with the parapet only has about a 6’ clearance between the wall and solar panels, so I only have about 2’ to work with. Building 1: Flat roof Rubber membrane Roof has a minimal lip before you drop 6 stories Has a penthouse that is recessed from the side of the building that I can put electronics on/in Building 2: Library Flat roof Rubber membrane ~40” knee wall/parapet Rubber membrane goes almost to top of knee wall, then is capped with lead and a lightning ground Outside of wall is glass Our basic philosophy here is to separate the access points and antennas (ie use external antennas). We can’t attach anything to the face of the Library (Building 2) because of the glass and I don’t really want to have to maintain electronics over the edge of a building anyway. So, how are people installing antennas on roofs pointed down to cover quads 60+’ below? I’ll figure out where to put the AP’s and dress in the cables. Mounting at ground-level isn’t going to work. There is too much sidewalk and landscaping that would have to be disrupted. It’d be a budget-buster. Again, physically attaching anything isn’t going to be acceptable and in Building 2’s (Library) case, a large weighted sled will encroach on the service area for the solar panels. There will be several antennae on each roof. Here are photos. The photo of Building 1 is a few years old. The angle with the rocks isn’t the side of the building I’m putting the antennae. You can see that in the 2nd photo. I just included the 1st photo because it’s a better view of the roof: VENDORS: I’m already working with Aruba and an integrator. If you have mounting suggestions, please let me know, but there is no sales opportunity here. Thanks, Brian ********** Replies to EDUCAUSE Community Group emails are sent to the entire community list. If you want to reply only to the person who sent the message, copy and paste their email address and forward the email reply. 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If you want to reply only to the person who sent the message, copy and paste their email address and forward the email reply. Additional participation and subscription information can be found at https://www.educause.edu/community ********** Replies to EDUCAUSE Community Group emails are sent to the entire community list. If you want to reply only to the person who sent the message, copy and paste their email address and forward the email reply. Additional participation and subscription information can be found at https://www.educause.edu/community
