A transformer matches the OCF dipole. A controlled coaxial section radiates before a choke blocks further common-mode current.
Antennas · F1SYH
Carolina Windom
The Carolina Windom is an off-centre-fed dipole variant that intentionally uses part of the feed line as a vertical radiator.
HF
OCF
Rayonnement vertical ajouté
Operating principle
Main characteristics
Typical gain
Variable selon bande
Impedance
Adaptée par transformateur
Polarization
Horizontale et verticale
Difficulty
Avancée
Dimensions and design
The two legs use an asymmetric ratio. The vertical coax length and choke position are part of the design.
Construction and tuning
Step 1
Select a documented version for the required bands.
Step 2
Cut both legs to the specified ratio.
Step 3
Install the specified transformer.
Step 4
Measure the vertical coax section.
Step 5
Install the choke at the designed distance.
Step 6
Keep the radiating section away from metal.
Advantages
- Several bands.
- Useful vertical component.
- Convenient off-centre feed.
- No traps.
Limitations
- Intentional coax radiation.
- Installation-dependent behaviour.
- Critical choke.
- Historically imprecise Windom name.
History and origin
The Carolina Windom was developed as a modern OCF variant adding a vertical radiation component.
Safety
The coaxial section before the choke radiates and must remain away from people and equipment.