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Off-Center Fed (Windom) HF Wire Antenna for ERC Frequency Bands Richard Wheeler (AI6RW) http://www.wheeler.com/ai6rw/ o

Off-Center Fed (Windom) HF Wire Antenna for ERC Frequency Bands Richard Wheeler (AI6RW) http://www.wheeler.com/ai6rw/ or richard@wheeler.com. Multiband Antenna Design Values Ai6rw Balun & 33% & 40% Systems 20% & 10% Systems Ai6rw Balun Kit Parts. Multiband Antenna Design Values. Shunt L.

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Off-Center Fed (Windom) HF Wire Antenna for ERC Frequency Bands Richard Wheeler (AI6RW) http://www.wheeler.com/ai6rw/ o

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  1. Off-Center Fed (Windom) HF Wire Antenna for ERC Frequency BandsRichard Wheeler (AI6RW)http://www.wheeler.com/ai6rw/ or richard@wheeler.com • Multiband Antenna Design Values • Ai6rw Balun & 33% & 40% Systems • 20% & 10% Systems • Ai6rw Balun Kit Parts

  2. Multiband Antenna Design Values ShuntL Length2 Length1 SeriesC T-Ratio Ai6rw Balun 50 Ohm Coax Transceiver http://www.wheeler.com/ai6rw/ or richard@wheeler.com 2/25/2009

  3. Ai6rw Balun & 33% & 44% AI6RW Balun 33% & 40% System 33% - 46’ antenna wire 40% - 55’ antenna wire Orange/White Green/White 33% - 92’ antenna wire 40% - 82’ antenna wire Blue core is: ur = 800 FT-114-43 or 5943001001 or 2643801002 200 Ohms Orange Green Brown A B Orange White Brown White Orange AI6RW 4:1 Balun Blue Cat5 Capacitor Green White Green Blue White 33% - 100 pF 40% - 150 pF Cat5 Capacitor Four 100 Ohm twisted pair lines Evenly separate windings Blue Core 200:50 Ohm Transformer Design: 4.5 foot length of Cat5 cable. 5 turns through 3 Fair-Rite cores. ur = 500,800,1500 Use either: 2646101902 or 2643101902 or 2631101902 *NOTE: Can also Use 5 turns of RG58/U RG303 RG62/U (teflon) coaxial cable. *NOTE: The last turn slides better by wetting the end with a little soap Cat5 capacitor: C = 4.8 pF/in Connect 4 solid colors for A Connect 4 white colors for B 100 pF = 21 inches 150 pF = 31 inches 270 pF = 56 inches 320 pF = 67 inches *NOTE: Wrap length of wire to form coil less than 2 inches in diameter. Tape. 12 Turns ***Note: Turns enter the core from opposite directions. 16” long Green Pair Orange Pair Note: Internet distributors for ferrite cores: www.kregercomponents.com www.pscelex.com www.newark.com www.palomar-engineers.com www.amidoncorp.com www.alltronics.com www.mouser.com Brown Pair Blue Pair AI6RW Balun Orange/Green *NOTE: Excellent reference for design of baluns: “A Ham's Guide to RFI, Ferrites, Baluns, and Audio Interfacing“ By Jim Brown K9YC http://www.audiosystemsgroup.com/RFI-Ham.pdf Orange White/Green White Orange White/Green White Orange/Green 50 Ohm coax to transceiver 50 Ohm coax to transceiver 2/2/2011 http://www.wheeler.com/ai6rw/ or richard@wheeler.com

  4. 20% & 10% Systems 320 pF Cat5 Cap 50 Ohm coax to transceiver 50 Ohm coax to transceiver 10% System 20% System 124’ antenna wire 28’ antenna wire 110’ antenna wire Yellow Core 16” long 2:1 tapped 40 uH inductor (200:50 Ohms) Yellow Core 2:1 tapped 40 uH inductor (200:50 Ohms) Yellow Core 12 Turns Orange 3:1 tapped 50 uH inductor (450:50 Ohms) 16” long 12 Turns Orange White Orange 8 Turns each Side by side A A Orange White Orange White Orange 150 pF Cat5 Cap Orange Yellow core is: Ur = 125 FT-114-61 or 5961001001 Orange B B Green White Orange White Green Green Green White AI6RW Balun Cat5 Length to balun start = 10 feet This length is 10% of antenna radiator Green White Orange White Green White Orange Orange White Orange Green Green 2/2/2011 http://www.wheeler.com/ai6rw/ or richard@wheeler.com

  5. 20% & 10% Systems Old Design 320 pF 10% System 20% System 124’ antenna wire 28’ antenna wire 110’ antenna wire Yellow Core Green OLD DESIGN 2:1 tapped 50 uH inductor (200:50 Ohms) 11” length Blue Yellow Core 12 Turns 3:1 tapped 50 uH inductor (450:50 Ohms) 16” long Green White Blue White Orange 8 Turns each Side by side A A Orange White Orange White Orange 270 pF Yellow core is: Ur = 125 FT-114-61 or 5961001001 B B Green Blue ***Note: Turns enter the core from same direction. Blue White Green White RG58/U Coax Length to balun start = 10 feet Outer shield of coax is part of the antenna 5 turns RG58/U Coax AI6RW Balun 50 Ohm coax to transceiver Orange White Orange 2/25/2009 50 Ohm coax to transceiver http://www.wheeler.com/ai6rw/ or richard@wheeler.com

  6. Ai6rw Balun Kit Parts old design Assembly Instructions BNC Solder Connector 180 pF capacitor 6000 volts 100 pF capacitor 6000 volts OLD DESIGN 3 ea Fair-Rite cores. Ur = 500,800,1500 Use either: 2646101902 or 2643101902 or 2631101902 Yellow core is: Ur = 125 FT-114-61 or 5961001001 2 each Cat5 cable Six foot lengths Blue core is: Ur = 800 FT-114-43 or 2643801002 http://www.wheeler.com/ai6rw/ or richard@wheeler.com 2/25/2009

  7. Ai6rw Balun Kit Parts Assembly Instructions UHF Solder Connector 3 ea Fair-Rite cores. Ur = 500,800,1500 Use either: 2646101902 or 2643101902 or 2631101902 Yellow core is: Ur = 125 FT-114-61 or 5961001001 Cat5 cable 20 foot length Blue core is: Ur = 800 FT-114-43 or 2643801002 http://www.wheeler.com/ai6rw/ or richard@wheeler.com 2/2/2011

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