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Long Wire Antenna 1:9 Balun for 3-50 MHz (by F4HWK): Here i present the fabrication steps for a long wire balun having a transformation ratio of 1:9. This balun is simulated with LTSpice and measured with a VNA.
The below antenna analyser plot views a 450ohm resistive load attached to the balanced side of the balun and measured at a nominal impedance of 50ohms presented as anticipated an approximate 50ohm load to the analyser and produced about a 1:1 SWR.
With the view to establish a quick and easy multi-band antenna deployment for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9:1 voltage unun is one possible solution. Requiring a unun to feed a long wire antenna ideally without a tuner a 9:1 voltage unun design using a ...
These are sometimes known as a Magnetic Longwire Balun. Its really an impedance transformer (9:1) to feed a high impedance, end fed (unbalanced) random wire which is likely to be a few hundred ohms, and transform it into something closer to a 50Ω (unbalanced) coaxial input, hence UnUn.
Un-Un with a fixed ratio of 1:9 (principle of core transformer) For this Balun you will find a lot of examples for antennas in the web. Used for random wires and. built-in ATUs in the Transceivers. In most cases the ATU will tune the antenna.
Manual 1:9 UnUn for long-wire antennas. The 1:9 UnUn is wrongly called a 1:9 BalUn in many sources. In my opinion, this is incorrect because there is no transformation to a balanced antenna system. The feed point of a long-wire antenna is nothing more than a broadband impedance transformer.
I'm always fascinated by the "magic" 9/1 un-un for longwire antennas, also called "Magnetic Longwire Balun". You build this device, connect the transceiver and a longwire antenna of almost random wire, and GO!!!
