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


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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 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
multiband antenna design values
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

ai6rw balun 33 44
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

20 10 systems
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

20 10 systems old design
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

ai6rw balun kit parts old design
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

ai6rw balun kit parts
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