The End Fed Half Wave Antenna
One of the major resources on the web for the EFHW antenna is AA5TB’s site. I have included many links to articles on his site but also have some others. If you are interested in the EFHW antenna, check them out.
Links
- AA5TB – introduction
- AA5TB – How To Make It Work
- AA5TB – QRP Coupler 30m-17m
- AA5TB – Mini Coupler 40m-17m
- AA5TB – QRO 20m-40m Coupler
- M5FRA – 3-Band Portable Wire Antenna
- M5FRA – 20m Vertical Half Wave Antenna
- WA5BDU – The End Fed Half Wave Antenna
- KC2UHB Diana Eng – Makezine – How to Make a Multi-Band EFHW Antenna
- N0LX – EFHW Antenna and Coupling Unit
- KI6SN – Trail Friendly Antenna and Coupling Unit
73, Al
2 Replies to “The End Fed Half Wave Antenna”
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I would advise against connecting the primary and secondary windings together which then make the braid of the coax feed into a counterpoise. My antennas worked better and gave a lower SWR with a counterpoise connected to the cold end of the primary of the coil.
PLEASE NOTE: the labels on the diagram above are reversed! The primary is has the greater number of turns and the secondary connects to the coax – it is a step down transformer!
See: m5fra.org.uk
I put another image of the EFHW antenna up (hopefully Steve does not mind), not showing the ground connection as you mentioned.
73 Al