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An 80-10 end-fed half-wave antenna can be a very good performing part of an HF station. But its performance depends heavily on a well-designed and carefully constructed 49:1 unun, which matches the long wire impedance to within tuning range of operation. But the perfor-mance of an end-fed antenna is also very dependent on height above ground.
The advantage of a voltage unun is its ability to easily match impedances, unlike a current un- un, which uses an isolation transformer to balance its input and output current, but suffers from impedance matching ability.
Use the online instructions to install the Prolific 3.2.0.0 driver (download, rename the extension to .exe, then run it) if you're not running Windows 10™
Een automatisch antenne tuner kan alleen tunen met beperkt vermogen anders raakt de tuner beschadigd. Een handmatige tuner (lucht condensator en rolspoel) kan vaak veel vermogen aan tijdens het tunen.
12 sie 2016 · A 9:1 unun is a transformer that reduces the impedance at the input by a factor of 9. So, if you connect a length of wire that presents an impedance of about 450 Ω to the input, you’ll get an impedance of about 50 Ω on the output. In fact, the 9:1 unun that I built is actually an autotransformer.
An End-Fed 160-10m Long Wire Antenna with a QRO 9:1 Un-un and 1:1 RF Choke Balun. So you’ve decided to homebrew an end-fed ‘Multi-band Sloper‘ antenna that will get you on the air from 160-10m. With a reasonably good ATU in the shack, you’ll achieve this and it won’t cost an arm and leg.
The tuner is only needed if the antenna system isn't matched (usually 50 ohm), if the antenna gives the right impedance, your setup is already complete. The tuner is usually used to make the antenna usable on the wrong bands or working wider.
