My most unusual HF antenna I ever had!
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- เผยแพร่เมื่อ 21 ก.ย. 2022
- This Ham Radio antenna could be configured as Vertical No-Radials, or a Sloper, or an Inverted L, or whatever shape you like! It needs the ATU with it to cover all bands from 80 to 10m. And it’s only some 12m long! Too good to be true? That’s why it’s my most unusual HF antenna I had so far!
It’s a fun DIY one hour or so project. I claim no originality. The roots of this design go back to 1936 when the article was first published in QST magazine on W3EDP antenna.
This design has got many incarnations during the decades. Jose , VA3PCJ offered the one I describe here.
Links to my other videos on some of my gear used in this video:
My RF Probe
• DIY RF Probe: cheap, q...
My RF Choke
• How to quickly make yo...
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73! Linas LY2H - แนวปฏิบัติและการใช้ชีวิต
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Great video, so much fun playing with different antennas
Great video,with excellent presentation of the theory, pre and post balun/unun and actual performance. This looks like a good performer for QRP portable operation.
A good Zepp that I use regularly for my POTA activations. I have tried various lengths of both the radiator and the counterpoise, with varying results. - Jason WV3V
Thanks for pointing me to this video. I will make the JUNIOR version tonight and research making my own 4:1 unun andv1:1 choke.
Short and to the point, like it , 73!
Great video !
very impressive!😜
Great video. Interested design. The analogy to the zep is interesting.
Good tests Linus, interesting how you check common mode current too. Good work.
Regarding the Guanella balun, the Elecraft switchable 1:1-4:1 uses a binocular toroid to mimic two transformers. It's easy to replicate for the home brewers among us.
Thanks for the info, it's certainly a nice Guanella balun implementation. The right binocular toroids might be hard to come buy, though. Hopefully, not:) 73! Linas LY2H
Excellent video Linus, charismatically presented as always.
You have inspired me to build one, 73 M7PBX
Just found your channel. Great antenna!
You are a cw wizard copying that bug! The unusual dit/dah balance completely crashed my brain hi hi
I'm amazed each time I hear this unique invention Vibroplex on the air! It requires special skills to send CW on it. Thanks for listening so attentively to my video! 73! Linas LY2H
Excellent video !!! Reminds me of a Zeppelin Antenna. Old reliable technology. Thanks for reviving and show us how efficient that design is. Please keep posting more interesting videos. I see you are having fun while doing them…. Keep them coming, we learn a lot in the process too. Hope to work your station one day.
73
Rob
YS1RS
Thanks Rob! It is kinda' Zep :). With summer here, I plan more antenna stuff! Stay tuned! 73! Linas LY2H
I think one of my next purchases will be an antenna tuner. Very interesting antenna with an interesting history. Thanks for the video de N7MRF 73s.
True - buy an Elecraft T1, which tunes EVERYTHING. /Mike
I think I have a new quick project. I haven't used window line in over five years. It should be fun.
Nice video, Linas. Will build one for testing. Built your common mode tester as well, works great.
If you can‘t get SotaBeams winder, please check out for the HQ-Winder Pro at Metropolis Drachen in Germany. They seem to be same, but just different branding.
Thanks a lot for the information, I'll check with them! 73! Linas LY2H
I use the Full size , the Jr and the mini for POTA. Works good. 73. N1XXU
Fantastic! How would you compare the Full size vs Jr? 73! Linas LY2H
@Linas_LY2H the full size tuned up easier on 40. Worked well on 40 and 20. The JR I had a little trouble tuning on 40 so I used a 9:1 Unun. Tuned up fine on all bands. The Jr worked better on 20 and 17 than the full size. I put it up as a vertical on my 12 meter Spider Pole as well as in a tree. The full size I put up as an inverted L.
@@Andrew-yx7sf Thanks for the info, very interesting and useful one! CUL, 73! Linas LY2H
You need an unun, a balun, and a tuner? You can get 1:1 on anything with all that. It's not a resonant antenna. But if you can make it work, that's great.
That's what Ham Radio is all about- making things work! 73! Linas LY2H
Excellent video, Linas! What an interesting antenna design.
Thanks Thomas! Everything new is old forgotten :) 73! Linas LY2H
Excellent video, well explained and demonstrated....mni tnx ! 73 de ON4CDJ
вау новая польская любительская станция !!!!
Hi Linus your 4 to 1 balun is a copy of the qrpguys unit, look there for the manual.
Thanks for the info Chris.
Linas, could you measure impedance/reactance just with the 1:1 common current choke? Without the 1:4. When you get i.e. 16 ohms using the 1:4 and the 1:1, you should get something like 64 ohms without the 1:4 and this would be closer to what we would want to see. 73, DL5MHK
Thanks Ralf! Yes, I probably could, just not these days: we've got tons of snow and the freezing temperatures :). Actually, it seems to me that the impedance behaviour in such an antenna heavily depends not only on the operation frequency but also on the role of the twin-lead feeder: on some frequencies it can act as a quarter wave stub, on the others- just like a short counterpoise etc. :) So, it will be interesting to make these measurements, thanks for suggestion again! I think I'll do this on the full-size version of this antenna installed on my 10m Spidermast. Weather permitting , though ... 73! Linas LY2H
@@Linas_LY2H Hi Linas, I would recommend to try it with the antenna you've shown here - so you have a direct comparison. Or for sure the fullsize version with and without the 1:4, to see the difference. But if you have a real part closer to 50 Ohms on the fullsize version, then it's not necessary. Long story short: Do it with this version first!
.... .. 73, Ralf, DL5MHK
@@ralfbuschner6925 Sounds reasonable!
Very educational sir. As we say in Texas, Don't MESS WITH UKRAINE!
I always learn something new! You Linas, are a natural teacher. It’s second nature to you, and your knowledge and expertise help me understand the principles and theory of Radio communications.
The Zepp is an interesting antenna, I never knew you could scale it down… the balun, and RF chokes, are also an important consideration. I have several RF chokes, but rarely need to use them, given I use Antennas which are not prone to common mode currents.
Thanks Linas, for the video, and the knowledge you share.
de W7UDT Rand (dit dit)