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EFHW transformer UNUN 49:1
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EFHW transformer UNUN 49:1 for ham radio, for use with end fed antenna
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Model information
- Source
- Printables
- Category
- Electronics
- License
- Creative Commons — Public Domain
Transformer for end fed antennas, 49:1. Parts needed:
- 140-43 ferrite
- 100pF mica capacitor(optional, needed for higher bands)
- BNC chassi connector
- Lab power supply connector or similar
- 1m approx. 1mm copper wire
Tested with 2530ohm dummy load, below SWR 2:1 for all bands upp to 27MHz. Use hot glue to fix ferrite and CA glue to fasten lid. Winding is 3:21 turns primary/secondary