49:1 EFHW Antenna Broadband Transformer

The 49:1 EFHW (End-Fed Half-Wave) Broadband Transformer is a specialised component used in radio frequency (RF) systems, particularly in amateur radio and portable radio operations. It is designed to efficiently match the impedance between a high-impedance antenna, such as a wire antenna, and the low-impedance input of a transceiver.
The EFHW antenna is a popular choice for portable and field operations due to its simplicity and ease of deployment. It typically consists of a single wire, often half a wavelength long, that is fed against a counterpoise or ground plane. This design allows for multiband operation, covering several amateur radio bands without the need for complex tuning or multiple antennas.

[@Sky1]

I have a large FT-240-43 Toroid, can I use that and what will the power capacity be?

[@vu3zag]

Yes, FT-240-43 can handle more power. A setup with single toroid can easily handle150 watt.

[@shouldb.studying4670]

That was great, thank you! I didn't follow the purpose of that first wire being twisted into a double strand sorry - if you have a minute could you (or anyone else) please try to educate me?

[@vu3zag]

Since it's expected to work as a Broadband transformer on High frequency -as compared to seperated windings of primary and secondary, a twisted pair acts as transmission line in Radio frequency and helps in better coupling along the length as well as through the core.

[@shouldb.studying4670]

@@vu3zag Thank you!