I was just referring to the shielding by bonding it to the cat5 crimp on ends, not soldiering them to the tower or grounding materials.  There is only a friction bond between the cat5 end and the grounded casing of the surge arrestor.  I would think the friction bond would have more resistance in a strike, causing it to heat up faster than the resistance of the soldier.

 

Again, with millions of volts, I don’t think the Cat5 cable would hold it as well.  The key to the whole system is the grounding to the tower site itself.  In this case, there are 3 runs of 5/8” or larger copper running from the grounding grid to the very top of the tower and 2 cad welded to the tower base and the grounding grid.  Hopefully the lightning will choose the path of the copper or tower, and not my run of cat5.  The shielding and soldier is only to dissipate static buildup and keep the potential voltages as close to equal as I can.

 

My thoughts are that if the antenna’s and equipment at the top are grounded to the tower, the equipment at the bottom, and all the surge suppression for the cat5 and coax runs are all grounded to the same ground plane, the potential voltage difference between any one location should be near 0, and there should be no need for it to travel up/down my cat5 run.

 

Hopefully it will never need to go through my soldier joint or the pressure of the spring steel in the surge suppression.  :)

 

Eric

 

 


From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Scott Reed
Sent: Sunday, August 27, 2006 5:07 PM
To: WISPA General List
Subject: RE: [WISPA] Self Adhesive Mini PCB supports for Mikrotik

 

I believe that solder is probably not a good idea here.  Lightning can build enough heat to melt the solder and thus break the connection.  I think all ground connections need to be physical connections to provide the best protection.

Otherwise, this looks like a good method.

There are several devices designed to give mechanical and electrical connection to shields, etc.

Scott Reed
Owner
NewWays
Wireless Networking
Network Design, Installation and Administration
www.nwwnet.net


---------- Original Message -----------
From: "Eric Rogers" <[EMAIL PROTECTED]>
To: "WISPA General List" <wireless@wispa.org>
Sent: Sun, 27 Aug 2006 14:36:16 -0400
Subject: RE: [WISPA] Self Adhesive Mini PCB supports for Mikrotik

> I myself use them at our tower sites at the bottom AND the top.  I had a
> tower get struck, directly and lost everything...including the switch at
> the location.  Since then, I figured 3mil volts can go through thin
> cat5e jacketing.  Even through the shielding if it isn't properly
> grounded.  Now I soldier the casings onto the crimp on ends when
> possible so hopefully it will go to ground without hitting the copper
> inside.  I use the Hyperlink surge protection, and the keystone jacks
> are for shielded cabling, so it goes to ground.  The surge suppression
> is just added protection.  Remember, electricity takes the least path of
> resistance, when metal heats up, it becomes more resistant.  So that
> bolt of lightning can go where it wants...
>
> That said, I am giving the electricity 2 points to exit to ground, so
> hopefully I don't lose any more equipment.
>
> The tower is WELL grounded, it is an old AT&T sight, with the copper
> mesh in the ground, and all buildings and towers have copper 5/8" or
> larger going up the sides and cad welded to them and also to the grid
> below ground.  LOTS of money...
>
> I don't at the CPE, just use the built-in surge suppression and
> definitely ground the CPE for static.  I see it as if the house gets
> struck by lightning; they have more to worry about than internet... Now
> if a tower gets struck, I have hundreds down, not 1.
>
> Eric Rogers
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
> Behalf Of Jeromie Reeves
> Sent: Sunday, August 27, 2006 12:00 PM
> To: WISPA General List
> Subject: Re: [WISPA] Self Adhesive Mini PCB supports for Mikrotik
>
> Do you find that a surge supressor at the CPE is better then at the
> internal PC/Router/Switch? Or do
> you use one at each end?
>
> Jeromie
>
> Harold Bledsoe wrote:
>
> >I can answer some of these...
> >
> >It looks like a Zinwell B191 RTL8181 with a Citel indoor surge
> >protector.
> >
> >-Hal
> >
> >-----Original Message-----
> >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
> >Behalf Of Jeromie Reeves
> >Sent: Saturday, August 26, 2006 9:24 PM
> >To: WISPA General List
> >Subject: Re: [WISPA] Self Adhesive Mini PCB supports for Mikrotik
> >
> >Looks good. What radio are you using with what looks to be a Realtek
> >SoC? Is that
> >a PoE splitter, a surge supressor, or both? How long is that RF
> pigtail?
> >
> >Jeromie
> >
> >Brian Rohrbacher wrote:
> >
> >  
> >
> >>I take a self tapper and run it out the bottom of my metal box, attach
> >>    
> >>
> >
> >  
> >
> >>a #12 piggy tail, and attach the other end through a hole on the
> >>board.  Kind of like the attached pic.  Should work, eh?
> >>
> >>Brian
> >>
> >>Harold Bledsoe wrote:
> >>
> >>    
> >>
> >>>One word to the wise on these:  many PCBs are grounded through the
> >>>screw holes.  If you are using plastic standoffs, you may want to
> >>>consider grounding the board some other way...
> >>>
> >>>-Hal
> >>>
> >>>--------------------------------------
> >>>Harold Bledsoe
> >>>Deliberant Wireless
> >>>http://www.deliberant.com
> >>>
> >>>________________________________
> >>>
> >>>From: [EMAIL PROTECTED] on behalf of Mark Nash
> >>>Sent: Fri 8/25/2006 1:04 PM
> >>>To: WISPA General List
> >>>Subject: Re: [WISPA] Self Adhesive Mini PCB supports for Mikrotik
> >>>
> >>>
> >>>
> >>>I'll take some... Catch me offlist.
> >>>
> >>>Mark
> >>>-----Original Message-----
> >>>From: Brian Rohrbacher <[EMAIL PROTECTED]>
> >>>Date: Fri, 25 Aug 2006 11:21:57
> >>>To:Conversations over a new WISP Trade Organization
> >>><wireless@wispa.org>,       [EMAIL PROTECTED]
> >>>Subject: [WISPA] Self Adhesive Mini PCB supports for Mikrotik
> >>>
> >>>
> >>>      
> >>>
> >https://secure.microplastics.com/detail.asp?part=minilockpcbsupport&fam
> =
> >cbhardware
> >  
> >
> >>>They have them in stock now.  I remember there was some talk about
> >>>      
> >>>
> >these
> >  
> >
> >>>a while ago.
> >>>$50 min order so I just got 400 or so of the self adhesive PCB
> >>>      
> >>>
> >supports.
> >  
> >
> >>>I got the 5/8 standoff (should be able to fit the cards under the
> >>>board too)
> >>>
> >>>I don't need 400, so if anyone wants a few, let me know.
> >>>
> >>>Otherwise, just letting ya'll know they are in stock.
> >>>
> >>>www.microplastics.com
> >>>--
> >>>WISPA Wireless List: wireless@wispa.org
> >>>
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> >>>http://lists.wispa.org/mailman/listinfo/wireless
> >>>
> >>>Archives: http://lists.wispa.org/pipermail/wireless/
> >>>--
> >>>WISPA Wireless List: wireless@wispa.org
> >>>
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> >>>http://lists.wispa.org/mailman/listinfo/wireless
> >>>
> >>>Archives: http://lists.wispa.org/pipermail/wireless/
> >>>
> >>>
> >>>
> >>>
> >>>      
> >>>
> >>    
> >>
> >-----------------------------------------------------------------------
> -
> >  
> >
> >
> >  
> >
>
> --
> WISPA Wireless List: wireless@wispa.org
>
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