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EFHW transformer UNUN 49:1 3D Printer File Image 1
EFHW transformer UNUN 49:1 3D Printer File Image 2
EFHW transformer UNUN 49:1 3D Printer File Image 3
EFHW transformer UNUN 49:1 3D Printer File Thumbnail 1
EFHW transformer UNUN 49:1 3D Printer File Thumbnail 2
EFHW transformer UNUN 49:1 3D Printer File Thumbnail 3

EFHW transformer UNUN 49:1

Printerman avatarPrinterman

May 21, 2025

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DescriptionCommentsTags

Description

Transformer for end fed antennas, 49:1. Parts needed:

  1. 140-43 ferrite
  2. 100pF mica capacitor(optional, needed for higher bands)
  3. BNC chassi connector
  4. Lab power supply connector or similar
  5. 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

License:

Creative Commons — Public Domain

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