Zip Cord Fun. A Compact Multi-Band HF Vertical Mo Radial Antenna | Ham Radio
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- Опубліковано 31 сер 2023
- The Zip Cord Antenna is nearly 100 years old, but is still a viable and very low cost option. Here is a compact. no Radial Antenna.It can be used for base station or portable operation. Here Peter G3OJV, discuses a vertical version that requires no radials and is broad-banded. Easy to build and fun to try out.
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• Compact, No-Radial, HF... - Наука та технологія
Excellent Peter, just superb. Thank you for reintroducing balanced line into the equation for the next generation of hams. It really is good stuff for multiband operation. BTW, I easily modeled the antenna shown here and it works very well indeed with nice low angle radiation. No radials required because the balanced line is the radial. Great to add a choke and feed with a remote tuner like an AH-4 in the field. Works a treat. 73 OM.
I really enjoy this gentleman’s videos. It’s almost like you’re listening to an old friend teach you something new and interesting. The day just gets better when he posts a new video. Thanks for what you do for our hobby, and 73, de NH7TR.
Sometime around 1965, I tried this with a DX-100 on 10M AM. It took some time for the odor of melting rubber to dissipate from the shack/bedroom. My mother was not pleased.
Well that's a clickbait title ! was lookng forward to seeing Pete going down a zipwire :)
Nice one !
I love it when there's a video about something i can actually try myself.
Zipcord and twisted pair lamp cord impedance is very close to 75 ohms and popular before coax was available to feed simple dipole from a simple transmitter, but very high loss when wet. Cat5 cable uses 124 ohm twisted pairs in the same way.
If I recall "correctly" (sometimes debatable!) one of the only antennas you can get away with making by using standard 75Ω TV coax cable (instead of 50Ω radio coax) is a dipole. Instead of using 440 ladder line.🤔
Thanks. But we really didn’t get much except a nice view. But not much more.
Nice RA1152 I have a fully restored and working one but sadly not much broadcast on AM these days 😢
When I was starting out and had no money one of the local amateurs (Doug GM6NX) sent me to Woolworths to buy a reel of bell wire. He said it was about 75 ohms. I pulled it out into a dipole and put it straight into my DX40 transmitter. It worked, but the solid core wire broke quite quickly. Multistrand would work better of course, but it shows what's possible.
Ah yes I had a Dx40- xtal controlled!
@@watersstanton Me too. Had to grind the ex military FT221 crystals to get them in the amateur band. Hard to believe, when I look at what's in my shack now. GM4SVM
Your diagrams are easy to follow, but how does the ladder line connect to the vertical at the feed point?
Hocus Pocus!
Thanks for nice explanation on zip cord antenna Peter.
I was wondering if one can make your own ladder line by just stripping the bottom twinflex and spacing it evry 300mm with 15mm long plastic spacers.
Yes you can.
That makes me wonder how it would work if I shortened the twin lead from 50' to 25' but left the wire at 50' and ran it horizontal; perhaps add a 4:1 balun and a 1:1 for isolation.
Looking for a 80 meter antenna to use in my small back yard. Any ideas? Only one tree on the property line.
Video title says Vertical "Mo" Radial Antenna? Typo? You can edit that in your channel's "manage videos" section.
Can we use a 300oOhm line which was used for TV reception years ago
Yes we can.
Same as a 20 meter J-pole?
How so ?
use twin flex and put 1 inch spacers in it and make your own ladder line
i build ZippyWhippy antenna's :) no really i'm serious :)
Peter, you might want to make sure your microphone isn't rubbing up against any clothes next time you record with it. I spent the first half the video listening to "rustle, scrape, rustle, scrape, rustle, scrape, rustle, scrape, rustle, scrape..."
Sorry for that.
@@watersstanton Happens a lot in videos. No problem.