Qorvus grounding

=== Single point grounding ===
Ground all electric equipment on a single one meter copper rod. With multiple grounding points, there is 
a difference in voltage at these points resulting a current surge when struck by lightning. Current flows due to a difference in voltage (V=ir or i = vroom - vkitchen/r) 
=== Grounding ===
http://groups.google.com/group/qorvus-meshap/browse_frm/thread/647ac9f2457f375a#
The motherboard must be mounted on a metal plate and the metal plate earthed. This prevents static electric damage.
As the fan blows air over the circuitry to prevent condensation, it builds up a static electric charge.
This is our annual reminder to double check that all
your wireless installations, especially those on towers, have adequate
in-line coaxial lightning / static protection and ethernet surge
protection installed. THIS IS REALLY IMPORTANT IF YOU WANT A RELIABLE
SYSTEM- THIS IS NOT A GOOD PLACE TO CHEAP OUT!
Lightning protection, which is a bit of a misnomer because it's really
static protection, saves your Qnode receivers from the kind of damage
that happens when static builds up on the antenna elements, and
discharges through the radio. This can happen even when there's no
lightning anywhere around, and can be caused by such things as cold,
dry air blowing accross the elements and building up a charge. This is
common in the winter, and in the summer in hot, dry climates.
The symptoms of receiver static damage can initially be subtle, you
will see an increasing lack of sensitivity in the receiver and the
links will show an ever-worsening rssi. Eventually the receiver will
becoime completely numb and won't be able to establish a link. Data
rates will slow to a crawl. Other times the radio card will simply die,
or will appear to work from the software side, but no radio links can
be established.
Ethernet surge protection and proper grounding of the case to an earth
ground, are just as important for reliable operation. You should run 14
gauge stranded copper wire from the Qnode case down the pole or tower
and to a copper-plated rod at least 3-6 feet into the ground near the
tower, depending on your soil conditions. If you neglect these steps
you can experience random failures of the motherboard, PoE spitters,
and Compact Flash cards.
You can buy the needed items at a good price here:
http://www.wlanparts.com/category/surge_protection/
You will need the dc-6 Ghz version for 5 Ghz links, for 2.4 and 900 Mhz
the less expensive dc-3 Ghz will work.
=== links ===
OutdoorBox , HardWare , MeshNetworking
Category:Sasecurity
Category:Wifi construction
Category:Surge protection
Category:Static protectoin
Category:Lightning protection
Category:Grounding
Category:OSP