Photos of SpaceX launches from launch complex 39 at Kennedy Space Center show 4 towers topped with white insulators topped topped with lightning rods grounded by catenary wires, that form a cage around the launch pads.
For example: http://johnbiehler.com/wp-content/uploads/2015/04/17135576246_325faafeaa_b.jpg From: Jaime Solorza Sent: Sunday, October 25, 2015 10:14 PM To: Animal Farm Subject: Re: [AFMUG] Site Grounding - what we are doing wrong? Franklin system... Jaime Solorza On Oct 25, 2015 8:46 PM, "Stefan Englhardt" <[email protected]> wrote: I see the big telcos build a kind of shield above/around their installations. Big poles connected with thick grounding cables on the edges. -------- Ursprüngliche Nachricht -------- Von: Ken Hohhof <[email protected]> Datum: 25.10.2015 23:37 (GMT+01:00) An: [email protected] Betreff: Re: [AFMUG] Site Grounding - what we are doing wrong? Well, not necessarily. It is possible to turn grounding and shielding into a religion and lose track of what they are accomplishing. For example, the power company guy in up in the bucket doesn’t rely on grounding to protect him from high voltage, and neither do the birds sitting on the wires. I’m not saying TJ is right, but be careful of adding more grounding without thinking about what you are grounding, to what, and why. I also wonder if Gino is seeing this everywhere, or just at a few towers. I think some towers have problems and you can’t fix it without going beyond just your equipment. If it’s everywhere, did this coincide with a change to a different brand/model of radios? From: Mike Hammett Sent: Sunday, October 25, 2015 5:06 PM To: [email protected] Subject: Re: [AFMUG] Site Grounding - what we are doing wrong? If what you've done isn't working, then it isn't enough, not that it's too much. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com ------------------------------------------------------------------------------ From: "TJ Trout" <[email protected]> To: [email protected] Sent: Sunday, October 25, 2015 5:04:32 PM Subject: Re: [AFMUG] Site Grounding - what we are doing wrong? Gino, Try not grounding at all? On Sun, Oct 25, 2015 at 1:39 PM, George Skorup <[email protected]> wrote: I have no doubt it's the SS clamping that's blowing the fuse. If there was no fuse, I bet the SS would continue clamping and start smoking if there's enough current to supply it. I don't know if it helps save things, but I'm leaning towards yes. Just getting all of the radios on the same DC bus seems to have helped quite a bit as well. On 10/25/2015 12:51 PM, Ken Hohhof wrote: Speaking of fuses, I know sometimes we get overcurrent trips on CTMs and SyncInjectors and have to reset them. Very rare, but always during storms. It is possible this is saving radios, I can't say for sure. -----Original Message----- From: George Skorup Sent: Sunday, October 25, 2015 12:34 PM To: [email protected] Subject: Re: [AFMUG] Site Grounding - what we are doing wrong? One thing we've been doing for several years now is a bonding wire up the tower. I do not trust the tower steel/leg joints being low enough resistance. Failure rate went way down. DC and fuses doesn't hurt either. On 10/25/2015 10:57 AM, Gino Villarini wrote: So we are loosing radios left and right due to lightning! Typical site setup: Radios on tower grounded to tower Shielded cable Shielded patch panel - grounded Regular cat5 jumpers Wbmfg SS - grounded Regular cat5 jumpers Poe device What's wrong?
