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Re: [TowerTalk] Lightning and wired networks was: Re: Lightning protecti

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Lightning and wired networks was: Re: Lightning protection
From: Pete Smith N4ZR <n4zr@contesting.com>
Date: Wed, 10 Jul 2013 10:57:27 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Alas, when you are a history major working with pre-made serial cables and USB-to-serial converters with pre-molded cable terminations shielding and shield terminations are apt to be iffy at best.

73, Pete N4ZR
Check out the Reverse Beacon Network at
http://reversebeacon.net,
blog at reversebeacon.blogspot.com.
For spots, please go to your favorite
ARC V6 or VE7CC DX cluster node.

On 7/10/2013 9:37 AM, Jim Lux wrote:
On 7/10/13 4:19 AM, Jim Brown wrote:
On 7/9/2013 6:40 AM, Pete Smith N4ZR wrote:
Sure, but the network cables were connected directly to the computer
motherboards.  I have also lost a couple of RS-232 ports on my K3,
which now has a DB-9 surge protector on it - I'm inclined to think
it's a design problem.

YES. Cable shields MUST be bonded to the SHIELDING ENCLOSURE (the
chassis) at each end.  If there is no shield, the signal return must be

<snip about the evils of indiscriminate use of shunt mode transient voltage suppression>


There's a lot about these issues on my website. http://k9yc.com/publish.htm



Standler's book also covers this in quite some detail, along with suggested designs.



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