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Micro EFHW antenna

par IU1OPK

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Micro End Fed Half Wave antenna for QRP

The toroid housing can be removed from the spool and directly connected to the radio with BNC-BNC male adaptor, cables, etc.

Bill of materials:
- FT-82-43 toroid (with 49:1 winding ratio)
- BNC female connector (Amazon, example: https://www.amazon.it/dp/B07DDDQP5M?)
- 100pF 3kV ceramic capacitor
- Mammut screw connector Art.80596 (cross dimensions 5.85x3.7 mm) (Amazon, example: https://www.amazon.it/dp/B00EAQPWVW?)
- BNC-BNC male adaptor, optional, only if you need to attach directly the antenna to the radio (Amazon, example: https://www.amazon.it/dp/B06XX8JBTW?)
- 23AWG or 26AWG wire (from online suppliers like Farnell, Mouser, DigiKey, RScomponents, etc)

Toroid housing and cap to be glued, fitting can be adjusted by scaling with some percentage one of the two components.

For examples and tutorials about EFHW winding and details visit my website, section "Articles, videos and links (international)".

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Thingiverse

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