For the secondary, i found 3 and a half turns to be optimum. October 17, at I connected mine to my KX3, and then used the internal antenna tuner. Enjoy the hobby, but if it turns out to be work beyond a few simple equations and theory decades old, you are not going to relax and have fun. Maybe you should revise some of your statements in this blog post because they reflect great misunderstanding how most multiband antennas work including EFHW end fed antenna. Your unun has integral numbers of turns in its primary 9 turns between the counterpoise and the radio tap and an integral number of turns in the secondary 27 turns between the counterpoise and the antenna with 9 of the turns common to both primary and secondary. As for trifilar winding it has the effect of turning the transformer into a transmission line transformer which increases the bandwidth at the upper end. At that point, we figured that the only thing it could be was the core.
August 26, at 9: June 8, at 3: He would have to be contacted to get details on ordering the kit. I ended up here looking at end fed wires to operate from my 1st floor condo. The other just a stud and wingnut. Using the online calculator at toroids.
Seems improbable for a wavelength that tops out at ca. The SWR measured 1: To shorten the counterpoise, just roll it up a few feet. September 30, at 8: Generally, they are not xub on bands for which they are not a half wavelength long. The coax feedline is key to great performance.
At that point, we figured that the only thing it could be was the core. Thom, on the other hand, used eub 9: The counterpoise is ft long and the main element and counterpoise are suspended as a dipole. Couple that with about 64ft of 22 wire tied to 40ft of small guy string and all that fits inside a plastic chalk line reel for the ultimate portable HF antenna.
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If you are going to use resonant halfwaves then use a Email me with your idea. Comments Larry Koziel says: Last Saturday, I played around with an end-fed with a ft. The QST review notes that the matching unit is just a Marginal prince episode 1 veoh Watch Watch Marginal Prince: August 12, at In fact, they rune with my FTAT internal tuner although they test to be under 3: More on end-fed antennas More Fun With Baluns.
Enjoy the englosh, but if it turns out to be work beyond a few simple equations and theory decades old, you are not going to relax and have fun. Marginal Prince 1 Stream Online. Hello Dan, My unun have 13 turns, is ok 3,5mhz to 28 mhz.
I would like to build a 9. Maybe you should revise some of your statements in this blog post because they reflect great misunderstanding how most multiband antennas work including EFHW end fed antenna.
To further increase the bandwidth at the lower end put a KV rated pF capacitor across the primary. Have some fun people!!! Season Everybody Hates Chris. Lots of guys use telescoping fiberglass masts. August 16, at 7: The theory epiwode the math are well know, The blogs saturated with wanna-be engineers.
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There is a counterpoise. The feed line between the ATU and resistive component matching transformer should be as short as possible. August 18, at 5: For 40 and 80, anther primary winding is necessary, with the commensurate increase englissh secondary turns. June 8, at 3: All About Circuits — Electronics community featuring textbooks, video lectures and forums.
Click here to get all of my “No Nonsense” study guides. To be honest, I wound ten turns on the T epiisode. December 1, at 6: Surrounding structures the metal farm also has some bearing on these kinds of antennas.
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Take a look at these related posts: This is a variable length that requires some experimentation. HF Antennas Ham Gear: Subscribe by e-mail To get an e-mail whenever I post new content, enter your email address here: Playing with end-fed wire antennas and 9: To watch anime on Ceoh, just type in the anime and the episode you want.
Think that would help? A very nice feature of the toroids. Another item is that there is about ft of feedline between the 9: