How thick is sufficient for 2m/70cm Yagies? (

Рет қаралды 9,519

2 жыл бұрын

Steven, KI5QAD, has noticed that the Yagi antenna has small elements and wire. He is wondering if increasing the diameter of the wire would be better? Increase range, Strength, Bandwidth, etc
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Пікірлер: 23

@AdamosDad 2 жыл бұрын

I've been at 72 years of age been a ham for almost 2 years, 1 month as a tech and the rest as a general. I bought a 1 inch aluminum square tube and some 3/8 aluminum rod, to make a 2meter 3 element YAGI it is wide banded.

@K5JHP-John 3 ай бұрын

Love your content. Been watching you for months.

@markg6jvy135 2 жыл бұрын

Good info Dave, thanks 👍👏👏

@LuckySawdust 2 жыл бұрын

About to do some DIY yagi and quad work - thanks for this!

@user-ki2ok6ww4y 5 ай бұрын

Casler You made it sound like the elements could be plastic or wood..for those who are a mature amateurs..

@KillerSpud 2 жыл бұрын

The Antenna Dave was talking about is called a "Caged Dipole," go ahead and google that term. They do look pretty difficult to work with physically, especially if you want to build an 80m version. Fortunately 80m is the only band where you can't always get away with a simple thin wire antenna. If you want to be able to receive broad band around something like 400-500mhz, then some thick elements might not be very hard to build. There is no reason you can't go out and do some experimenting. Edit: An 80m/75m fan dipole would be a lot easier to build than a Caged Dipole.

@kelvin0mql 2 жыл бұрын

Kevin L., The Old Tech Guy did an experiment recently with a caged EFHW on 20m & got impressive bandwidth improvement, however dubiously it might be to say it was needed. Interesting, nonetheless. As for me, I run an inverted V with a motor in the middle that runs 2 spools of stainless thin cable… so I can lengthen or shorten the dipole at will without leaving the shack. It’s pretty nice to never (OK, rarely) need to engage the tuner at all. Every antenna is a compromise… I compromised on up front cost. LOL

@howardhiggins9641 2 жыл бұрын

I built a Yagi 50 years ago with a steel beam, and it didn't work worth beans. In a fit of desperation, I replaced it with a small broom stick, and it worked great.

@jamess1787 2 жыл бұрын

That's great 😊👍

@BusDriverRFI 2 жыл бұрын

On EZNEC, I have modeled an 80m dipole passive which exhibits better than a 1.5:1 SWR over the entire band. I Think it looks feasible without resistors.

@david_W5QDF Жыл бұрын

The thicker elements results in higher wind resistance which can be detrimental for the average pole the yagi is mounted on. Lower wind resistance puts less stress on the structure holding the yagi up in the sky 📻

@mmpiforall5913 Жыл бұрын

In the OWA example, is the characteristic impedance 50 ohms or is a balun required. Can the spacing of the first director be used to tune impedance?

@stridermt2k 2 жыл бұрын

Great stuff and an interesting question too! Thanks Dave! 73 de N2NLQ

@zephaniahpickering4658 6 ай бұрын

Why don't you show how to do 70 cm 3 element yagi?

@DontTreadOnMe825 2 жыл бұрын

Thanks Dave - informative as always :) 73 de M7CCQ

@abitofeverything9970 2 жыл бұрын

half an inch is 12.7mm not 13.1

@davecasler 2 жыл бұрын

you are correct. I had the wrong conversion factor in my head. My 13mm wrench works very well on 1/2" bolts.

@zephaniahpickering4658 6 ай бұрын

All you ever cover is 2 m

@garrysekelli6776 2 жыл бұрын

I'm still not comfortable with the radical leftist propaganda but I find the technological info provided on the channel interesting. Slightly.

@gaptastic 2 жыл бұрын

huh?

@garrysekelli6776 2 жыл бұрын

@@gaptastic watch his previous videos where he explains the Waco massacre as just the government doing it's job.

@BryanTorok 2 жыл бұрын

@@garrysekelli6776 Link? Title and/or date of that video? I would agree with you, but I've watched dozens of his video and seen nearly no political commentary.

@kelvin0mql 2 жыл бұрын

@@BryanTorok Well… Dave recently got pretty animated about 80m. Some of that could be seen by some (not me) as political. Depends on one’s perspective.