They do lightning protection with very expensive commercial protectors, and the new solid state transmitters can sense the condition and momentarily shut down while the protector is doing it's thing which is basically becoming a short-circuit to pass the energy to ground, otherwise the transmitter would provide enough power to keep the protector in the fired state, and the transmitter wouldn't be too happy looking into a short-circuit.
Greg On Aug 30, 2012, at 9:12 AM, Mike Hammett <wispawirel...@ics-il.net> wrote: > AFAIK, you bond all metal objects with the tower itself. You aren't going to > avoid the RF, so you "make peace" with it. > > I am kind of curious, though, how they handle lightning and ESD on a hot > tower. They surely have a method because those transmitters aren't throw-away > items. > > > > ----- > Mike Hammett > Intelligent Computing Solutions > http://www.ics-il.com > > ----- Original Message ----- > From: "Greg Ihnen" <os10ru...@gmail.com> > To: "WISPA General List" <wireless@wispa.org> > Sent: Thursday, August 30, 2012 8:11:33 AM > Subject: Re: [WISPA] Guidance for mounting gear on an AM tower > > > The tower is the AM antenna correct? If you ground your gear to the tower, > aren't you connecting your gear directly to the "antenna"? It seems like if > to try and avoid RF you connect to the thing that is energized with RF it's a > step in the wrong direction. > > > Is the tower a grounded-base or insulated-base (the tower stands on a big > insulator). If it's an insulated-base antenna you're definitely not > "grounding" your gear by connecting to the tower since the tower isn't > grounded. > > > Greg > > > On Aug 30, 2012, at 9:01 AM, Mike Hammett < wispawirel...@ics-il.net > wrote: > > > You'll want to isolate the power with an isocoupler. > > > > ----- > Mike Hammett > Intelligent Computing Solutions > http://www.ics-il.com > > ----- Original Message ----- > From: "Brian Gray" <brian.g...@joinkllc.com> > To: wireless@wispa.org > Sent: Wednesday, August 29, 2012 7:43:51 PM > Subject: [WISPA] Guidance for mounting gear on an AM tower > > > Besides staying away from an AM tower, does anyone have any guidance as far > as mounting equipment, specifically POE equipment on one without problems for > us or the AM tower? > > > How do I keep AM RF out of my POE cables and my radios / antennas? > > > How do I ground my gear? > > > My initial thoughts are: > > > Install equipment enclosure at base of tower, attached to tower. > Run 1" metallic liquid tight (MLT) up tower to aluminum enclosure at 200', > continue run from enclosure with 1" MLT up to 300' to additional aluminum > enclosure > run 2 3/4" MLT from 200' enclosure to 2 backhaul radios (probably UBNT NB25 > to start with) > run 3 3/4" MLT from 300' enclosure to 3 sector antennas (probably UBNT Rocket > M2) > drill small weep holes in 3/4" runs as they will not be weather tight to > radios > run shielded cat 5 inside metallic liquid tight. > Put 2-3 ferrite cores on the ends of all of the cables. > install poe surge arrestors on both ends of cables, just before radio and > just before router. > wrap rf choke into both ends of a/c power cable running from enclosure to > circuit panel > No clue on grounding this thing. > > > > Thank you in advance! > > > > > Brian Gray > > Joink LLC > Network Manager > 812-231-7087 direct > 812-870-3332 mobile > > Joink Customer Support 1-888-31-JOINK > > > _______________________________________________ > Wireless mailing list > Wireless@wispa.org > http://lists.wispa.org/mailman/listinfo/wireless > _______________________________________________ > Wireless mailing list > Wireless@wispa.org > http://lists.wispa.org/mailman/listinfo/wireless > > > _______________________________________________ > Wireless mailing list > Wireless@wispa.org > http://lists.wispa.org/mailman/listinfo/wireless > _______________________________________________ > Wireless mailing list > Wireless@wispa.org > http://lists.wispa.org/mailman/listinfo/wireless _______________________________________________ Wireless mailing list Wireless@wispa.org http://lists.wispa.org/mailman/listinfo/wireless
