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LIGHTNING AND
THE RADIO AMATEUR
Glenn R. Cate
N4GRC
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Lightning: This Could Be Your Station!
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Lightning Areas of the World
• Hotspots with at least 1000 people living
nearby
– Las Lagunitas, Lake Maracaibo, Venezuela
(lightning storms 297 out of 365 days per year)
– Kabare, Democratic Republic of the Congo, Africa
– Kampene, Democratic Republic of the Congo,
Africa
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Tampa Bay: Lightning Capital of the
US?
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Tampa Bay: Lightning Capital of the
US?
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Tampa Bay: Lightning Capital of the
US?
1. Mississippi
2. Orange/Seminole Counties, FL
3. Tampa Bay/Daytona/Palm Beach
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Lightning: What is it?
• Lightning The series of electrical processes
taking place continuously by which charge is
transferred along discharge channels between
electric charge centers of opposite sign.
(American Meteorological Society)
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Lightning: Pulse, Stroke, Flash
• Pulse: lightning discharge within cloud or
multiple clouds
• Stroke: (or cloud-to-ground stroke): lightning
discharge in a cloud to the ground
• Flash: one or more cloud pulses and/or cloud-
to-ground strokes that occur in 1 second
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Lightning: Hotter Than the Sun?
• Lightning is 53,500 F
• Surface of the sun is 10,300 F
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Lightning Can Be Found In…
• Thunderstorms
• Tornadoes
• Hurricanes
• Volcanic eruptions
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Lightning Records
• Longest duration: 7.7 seconds
• Farthest horizontal distance: 200 miles
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Lightning Energy
• Voltage: 40,000 to 120,000 V
• Amperage: 5000 to 200,000 A
• Wattage: 1 x 1010 W or 10 billion W
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Lightning: It’s Dangerous!!!
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Lightning: It’s Dangerous!!!
• https://www.youtube.com/watch?v=8ny3N-
smAUc
• After video—what stories do you have of
lightning and ham radio? (brief)
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Lightning Protection
• What can I do to protect my ham shack
against lightning strikes?
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Lightning Protection
• Move!!! Relocate your ham station to:
– Los Angeles, CA
– Or Egypt
– Or Antarctica
– These places have only 0-0.75 lightning flashes per
square mile/year!
– Contrast Tampa Bay: over 28 flashes per year!
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Lightning Protection
• Move!
• Disconnect EVERYTHING in your ham shack!
– Outdoor antennas (and ground them!)
– ALL indoor equipment including radios, power
supplies, chargers, etc….ALL radio shack equipment
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Lightning Protection
• Move!
• Disconnect EVERYTHING in your ham shack!
– Outdoor antennas (and ground them!)
– All indoor equipment (radios, power supplies,
chargers, etc….ALL radio shack equipment
• Design/install a good ham radio grounding
system in your shack
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Grounding Design
• ARRL “Grounding and Bonding”
– Where to locate (or relocate) your station
– Identify what to protect (xcvrs, tuner, p/s,
computer, CATV, telephone, electrical panel)
– SPGP (Single Point Ground Panel)
– Ground rod system
– Think Like Lightning !
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SPGP (Single Point Ground Panel)
• Single point where ALL antenna feed lines,
control lines, equipment power are brought
together to share a common ground
connection
• SPGP is the one and only point where direct
connection to lightning ground system is made
• CATV, telephone connects here also
• Close as possible to AC power service entry
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Single Point Ground Panel
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Use Copper Strap (not wire)
• Copper strap: 2 to 3 inch width
• Low resistance AND low impedance (skin
effect) Lightning RF is 10 - 100 MHz.
• More surface area in ground to sink current
• More surface area when attached to ground
rods
• Keep copper strap runs as straight as possible
with no sharp bends
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Ground Rods-How Many?
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Ground Rods-How Many?
• One is better than none!
• Suggestion is 4-5 ground rods as a minimum
• Eight foot, 5/8 inch, copper plated (usually 10
mil thick copper plating)
• Place ground rod every 16 feet
• Perimeter ground is best if possible
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Ground Rods
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Ground Rods
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Ground Rods
• Use Cadweld or other exothermic process to
weld ground wire to rod.
• Or braze strap to rod.
• Prefer to use 2 to 3 inch copper strap
• Use mechanical plates or weld strap to ground
rod—DO NOT SOLDER!
• Use Copper “Goop” for ALL mechanical connections!
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Ground Rods-Exothermic Weld
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Ground Rods-Exothermic Weld
• https://www.youtube.com/watch?v=oNDdVl
WhBqA
• https://www.youtube.com/watch?v=ealSEITH
wKk
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Lightning References
• List of Lightning Protection Links (ARRL):
http://www.arrl.org/lightning-protection
• Grounding and Bonding for the Radio Amateur
(ARRL): http://www.arrl.org/shop/Grounding-
and-Bonding-for-the-Radio-Amateur/
• Lightning Protection for the Amateur Radio
Operator’s Home (ARRL): http://www.arrl.org/files/file/QST/This%20Mont
h%20in%20QST/June2017/Chusid-Morgan.pdf
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Lightning References
• So You Think You Know Lightning? (Vaisala)
https://www.vaisala.com/sites/default/files/d
ocuments/Lightning-Booklet.pdf
• Lightning Explorer (Vaisala)
http://thunderstorm.vaisala.com/explorer.htm
l
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Lightning References
• ARRL “The Doctor Will See You Now” –
Grounding
http://www.arrl.org/files/file/DoctorPodcast/
April%2013%202017%20-%20Grounding.mp3
• Erico Lightning Protection.
https://www.erico.com/catalog/literature/E11
47C-WWEN.pdf
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Lightning: Final Thoughts
• It’s just a matter of time when your home (and radio shack) will be hit by lightning
• Protect your shack every time you leave QTH
or go QRT
• Disconnect/ground all antennas not in use.
• Invest in SPGP/perimeter ground of your
shack-your new ICOM IC-7610 will thank you!
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Lightning: Questions
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TKS ES BEST DX
• N4GRC
• Twitter: @grcate
• LinkedIn:
www.linkedin.com/in/grcate
• Blog:
www.gcatewifi.wordpress.com