Grounding, Bonding, Safety, RFI By Bill Mader, K8TE
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1 Grounding, Bonding, Safety, RFI By Bill Mader, K8TE
2 Longer Lives for You and Your Radio Safety First Grounding Bonding Keep the Noise Down RFI Radio Frequency Interference Buy the Book by N0AX!
3 Safety First Grounding National Electrical Code Safety! Electrical Safety Current Kills! No Help with RFI No Antenna Improvement Combine with Bonding for Safety! Lightning Protection (not Prevention)
4 National Electrical Code Helps Lessen Likelihood of This
5 National Electrical Code NEC/National Fire Protection Association DGYBS (Don t Get Your Butt Shocked) Test Your Outlets Lights Dim on Transmit? Loose Connections Lead to Fires Wiring Size Too Small Don t Cut/Bypass the Green Wire! Here, Hold My Beer. What Could Go Wrong With This?
6 NEC on Grounding Ground Neutral at Breaker Panel Only Tie All Grounds to a Single Point Inspect At Least Annually! If In Doubt, Get Help Local Code Additions Matter Avoidance Can Cancel Your Insurance Payout Be Careful 120 VAC Can Kill You!
7 Bonding (NOT Grounding) Robust, Low Resistance, Short Between All Gear The Connection Order Matters Lightning is a Pulse, Not Direct Current Inductance Matters Fast Rise/Decay Times Thanks to Jim Brown, K9YC
8 What to Bond? Everything! Power Service Entry Telephone Entry Cable TV Entry Antenna Entry Operating Desk All Ground Rods Towers near the Building Building s Structural Steel Grounded Metallic Plumbing
9 How to Bond K9YC EVERYTHING TOGETHER! Separate Bonds are Hazardous!
10 How to Bond K9YC Bigger is Better At Least 4 AWG for Towers At Least 10 AWG for Shack Steel Conduit (Properly Installed) is OK Shorter is Better Wires are Inductors Steep Pulses with High Current = High Voltage Resistance (Ohmic) is Futile in Bonding
11 Why Bond Equipment? K9YC Lightning Doesn t Follow Maps Kill Hum, Buzz, RFI Shields Carry Leakage Currents Shields Act as Antennas (TX & RX) Pin One Problems Cause Noise Poor Engineering Construction Practices Shield Not Bonded to Metal Case at Ingress and/or Egress Coupling Inside Gear Creates/Allows for RFI
12 Pin 1 Example W5UR
13 Rigs with Pin 1 Problem W5UR
14
15
16 RFI Radio Frequency Interference Switching Mode Power Supplies Cell Phone Chargers Laptops/Desktops/Tablets USB Hubs Our Own 12VDC Power Supplies! Station Layout (W8JI.com) All the New Stuff Your Neighbors Buy If it ain t heavy, it s RFI ing K8TE
17 In House Search Identify & Document RFI by Band Connect Rig to a Battery (Should be Standard ) Turn Off Main Breaker Check All Bands Previously Noted Some RFI Disappears? Enable One Breaker At-a-Time Locate and Discard/Replace the Culprits
18 Neighborhood Search Rotate Your Beam Document Frequencies/Time/Spectrum Use Portable Radio; Short Wave is Best Search for Loudest Signals Good Luck from Here Common Additional Sources Grow Lamps (Mary Jane?) Solar Systems Variable Speed HVAC LED Lighting Research Replacements
19 RFI Remediation Move to the Boondocks Buy Spouse an LED TV (K8TE) Separate RX Antenna (Magnetic Loop) Noise Cancelling System DX Engineering NCC2 Move Beyond the Boondocks in NM RX Noise Blanker Use CW (Narrow the Bandpass) Use JT-65/FT-8 ( Below Noise Capable)
20 40m Noise at K8TE on 80m OCF
21 40m Noise at K8TE on 80m R8 W5UR
22 Grounding and Bonding for Us Ward Silver, N0AX Engineer Long Time ARRL Editor Fun, Amiable Guy! Buy the Book
23 What Did I Tell You? Safety First Grounding Bonding Keep the Noise Down RFI Radio Frequency Interference Buy the Book!
24 DCHF Highlights Three Days of 50+ Concurrent Technical & Operational Sessions September Register Now! HF University 2.0 All Day Friday EmComm College All Day Friday AMSAT Academy All Day Friday VE License Prep & Testing SKYWARN Training Sunday Morning QSL-card Checking for ARRL Operating Awards Build-a-thon With Rex Harper, W1REX
25 DCHF Highlights Two Breakfast Banquets Evening ARRL Awards Banquet Friday Evening Mixer and Auction All With Separate Door Prizes Raffles With Exceptional Prizes (2) IC-7300 s and KX2 (probably) & More Manufacturers and Commercial Vendors STEM-Student High-Altitude Balloon Launch En Route to CubeSat!
26 DCHF Highlights Indoor Flea Market Friday/Saturday Outdoor Tailgate Market Consider Volunteering Free Admission/Prize The Venue: Isleta Casino & Resort Convention Center 10 Minutes South of the Albuquerque Airport Food Station for Lunch Early Admission Only $12.50! $15.00 at the door Sign-up for Monthly Updates
27 Questions No Dumb Questions Maybe a Dumb Answer
28 References
29 Pin 1 Fixes Rewire Connector Shield to Metal Chassis Bond Connector to Chassis, NOT PCB Use Common Mode Choking Snap-on Ferrites Wind Cables around Ferrite Cores Bonding Gear Together and to Shack Ground Reduces Noise Generated by Gear Eliminates Shock Hazards Bond Multiple Outlet Boxes Together Use Larger (12/10 AGW) to Breaker Panel
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