ar station grounding - semarc
TRANSCRIPT
KSØJ 2011 1
AR Station Grounding
Grounding – Why do We Ground?Radio Performance Personal SafetyLightning “Protection” Tradition ?
KSØJ 2011 2
AR Station Grounding
Station PerformanceReceiving – Signal Reference Receiving – Noise RejectionTransmitting – Radiative EfficiencyAntenna & Noise – Balanced or NotThis Ground is Part of the Antenna
KSØJ 2011 3
AR Station Grounding
Personal Safety - CodesPower GroundBypass Leakage CurrentsNo Float – Voltage Feedback Radio
KSØJ 2011 4
AR Station Grounding
Lightning & Static ProtectionStructure Protection - TowerHigh Voltage SurgesCurrent Effects (EMP)Static Build-up (Wind Static)Virtual Grounding IneffectiveAll Lightning Issues are Probability
KSØJ 2011 5
Tower Grounding
KSØJ 2011 6
Tower Grounding
KSØJ 2011 7
Tower Grounding
KSØJ 2011 8
Tower Grounding
WRONG WAY !!!
KSØJ 2011 9
Tower Static Control
KSØJ 2011 10
Antenna Grounding
KSØJ 2011 11
Grounding Hardware
KSØJ 2011 12
Voltage Surge Control
KSØJ 2011 13
Voltage Surge Control
Antenna RadioV
Ground
KSØJ 2011 14
AR Station Grounding
SolutionsNo One Solution for All CasesDon’t Ground Just to GroundSet-up One Case for “On-air”Set-up Another for “Sleeping”
Ground Everything In Case of a StormUnplug Everything AlsoDisconnect Antennas
KSØJ 2011 15
AR Station Ground (1)
Discussion (1)Who Says We Need a Ground ?The NEC (Code) Only Specifies OneLet’s Think About This LogicallySo Many Configurations PossibleGround by Trial
KSØJ 2011 16
Traditional Radio Connection
Antenna
Ground
Radio
KSØJ 2011 17
Modern Radio Connection
Antenna
Ground
Balun
Coax
Dipole antenna
balun
Arrestor
Radio
?
KSØJ 2011 18
AR Station Ground (2)
Discussion (2)Station Ground ?The Theoretical Single Point GroundGround Noise CurrentsPortable OperationMobile Operation
KSØJ 2011 19
Ground Noise Sources
balun
Dipole antenna
Radio
Power Line
Antenna
Ground
Noise Current
Arrestor
Balun
Line
KSØJ 2011 20
Station Ground Bar
KSØJ 2011 21
Station Ground
KSØJ 2011 22
Grounding and Lightning Protection Resources
1. ARRL has many sources on Grounding and Lightning 2. List of Information links:
• http://www.arrl/org• http://www.protectiongroup.com/PolyPhaser• http://n3oc.dyndns.org/trench.htm• http://www.w8ji.com/station_ground.htm• http://www.ve3sqb.com/hamaerials/kf6gdj/• http://www.dxzone.com/catalog/Technical_Reference/Grounding/• http://www.dxengineering.com/pdf/LightningProtection-Rev2.pdf
KSØJ 2011 23
Grounding and Lightning Protection Resources
3. List of supplier links:
• http://www.harger.com/• http://www.dxengineering.com/• http://www.protectiongroup.com/PolyPhaser• http://www.alphadeltacom.com/• http://www.stormcopper.com/• http://www.gacopper.com/index.html• http://www.aesham.com/• http://www.grainger.com/Grainger/wwg/start.shtml