EFHW antenna
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End fed half wave antenna
This antenna should work for 40-20-15-10
Based on the HF Kits antenna linked below.
Theory of operation[edit | edit source]
This is a random wire antenna with a high impedance, and a balun to divide that impedance to something sort of close to 50 ohms.
Bill of materials[edit | edit source]
CASE
- abs box, 3d printed
- Ferrite: FT240-43
- Magnet wire: 12-14 awg
- 100pf capacitor
Coax connector
- 1 so239 panel mount
- 4x m3 screws
- 4x m3 nuts
- 4x m3 washers
- 1 m3 wire nut
Antenna connection
- 2x rope cable clip (for wires)
- 1x insulator (for antenna wire)
- 1x m5x30 eye bolt (strain relief)
- 2x m5 washer
- 2x m5 wire nut
- 1x m5 wing nut
- Antenna wire: 66' UV resistant, ideally kevlar and Teflon coated
Instructions[edit | edit source]
- Replace case screws with whatever fits your so239 panel mounts
- case needs to be good in tension and generally structural
- wind ferrite core (turns?)