Constructing the 7 Band Cobweb 73's Antenna (
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- เผยแพร่เมื่อ 28 พ.ย. 2024
- Part 2 on the 73's Cobweb Antenna Series. We will contruct it and go through all the untangeling and tightening to build it. Source: 73antennas.com...
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Edited by Callum Jakeman
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ThankYou David and Kalum, for showing the antenna construction!
"The fundamental rule of antennas is that everything affects everything."
Well said!
Hi Dave, thanks for the build; very nice.
I was going to say that it seems to me that virtually every antenna that involves booms, poles, etc.; except plain wire antennas, - that building it on a vertical post is nearly mandatory, so that you can support it, spin it, get at the top & bottom to adjust & tighten things...
As I am 6'3", I figure a pole that's about 5 foot is just right. I can stand up & look down on it, or sit in a chair below it.
Before you put it up on the tall pole for testing; please do some SWR & listening tests where it is, to illustrate how the SWR is impacted with differing heights.
Thanks & 73, John - N7GHZ
Very good Dave, in addition being from the other side of pond I enjoyed the views of the local topography...
Looks like a well thought out rig! Thanks for posting.
Hi Dave! Looking forward to your video on testing this big babe! Thx and 73!
I'd like to see what the SWR is and how it receives low to the ground to compare to how it performs up in the air on a pole. Also, it would be good to know how close they got the tuning or how much tuning one should plan on having to do.
Nice antenna. At $479 it does seem a bit pricey to me. On the other hand, it does seem well made with fiberglass and stainless steel and all the cutting and fabricating done.
The neighbor: "Look Martha! That neighbor Dave is putting up another antenna!" Keep em coming Dave, thanks so much. K7KS
I often think that's what my neighbors are saying. Before, they settle in for a cookout and a show😁
I wish I had the space to use this type of antenna. I appreciate your time and showing us how to put it together.
Thanks, Dave! Been looking forward to the continuation of this antenna review!
Me thinks I'll stick with my 49:1 EFHW dipole.....I've been working the world late at night, FT 8 of course.....and CW when I can find them 73/K6SDW
I was going to buy the MFJ cobweb until I saw this video. The materials and construction methods are way better than MFJ’s antenna. I read many reviews of the MFJ’s materials were sub-par. When I saw this antenna I knew that the extra $50.00 was a smart move over the MFJ.
Nicely assembled and looks great. I am sure this Antenna makes some noise... 💯👍💯🎸🙋♂
Damn Dave ! How do you do it ?
I mean just the prep work and setting up videos etc is a ton of work. Not to even mention the actual video itself. Glad your able to keep doing them....Dont overdo yourself though...73 OM ...N8QZH
73 Antenna is smart because we don't use instructions anyway ;) Half of the fun is fumbling through the parts whilst figuring out how to put it together, and as a bonus there are usually extra parts laying around at the end of the build, that would have been wasted had we read the instructions. So, just say no to instructions, and use those extra parts for other ham projects! Cheers and 73 EDIT - On a serious note, it is nice 73 sent extra parts in case they are needed in the future. Also, the design is good enough where instructions are not needed, and this appears to be the case.
I wrote the guys from 73 antennas but they said only within couple months they will have a remote warehouse in Europe, namely Spain... As i am in Portugal, will have to wait because the freight from Australia to up here for such a big package will cost more than the antenna itself, probably... The antenna looks quite well done and easy to assemble. Looking forward for your testing video!! Thanks!!
Dave, thank you for showing us this very interesting antenna. It's very well made with dipoles for 7 different bands all on the same framework. Kudos to your helper too. Does he have his license yet? (hint-hint) 73 de K7RMJ Frank
Another excellent review.
Could you please tell me how long each end of the antenna is? Thank you very much
Nice antenna, I am considering one.
I would have bolted all but the balun arms down first. Then the lines to square it up. Then the radials.
Ideally, if you had yourself and another, you could be attaching parts while the other person worked on the tangled radials. Looking forward to the next video on erecting the cobweb!
73, DE KB2WZT
Hi Dave, Its been 10 months, Are you still happy with the Cobweb?? Thanks
Dave, great video, other than the wire and rope problem it went together very nicely. I am not sure I have the room for one but it sure was a lot easer then when I put up my AV-680. I will have to check but if I have room it would be something I would diffidently be interested in.
Dave, do you think, once complete assembled, it would be possible to fold and unfold the antenna (with a „individual mechanism“) for using it for a temporary mounting in a area of limited space? Unfolding it first at a „suitable height“. Like a Rotary dryer. 73‘, Stefan
Smaller cobwebs (10m - 20m) are sometimes shipped fully set up, tuned and folded like you say. All you have to do is unfold and secure the arms with the supplied screws. It would be very easy to reverse this proces... This one is twice the size of a 'normal' cobweb, so it won't be that easy...
Thanks Dave for showing the complexities. I remember your video on mfj 2010. You said Unroll the wire. Was this not an option?
looks like my Australian hills hoist clothes line my be a contender.
I was thinking the same thing. A great Aussie invention. :)
That rope is like Christmas lights.
If the manufacturer is stubbornly maintaining that no manual is needed, he certainly isn’t going to welcome feedback about winding the elements on cardboard formers.
Didn't read the comments from the manufacturer i guess.
great video Dave. thanks.
(the key to unraveling wire and rope is - hire a kid)
Perhaps not 40, but, building something like that into a plastic gazebo or sun shelter would be a great HOA beater.
I can't believe they would ship the antenna wire as you have shown. What a frustrating mess for a very extensive antenna.
Before assembly, it might be called the Spaghetti Antenna!
Callum
Everything about the antenna is great, except for the really low power rating. I would buy one tonight if it were rated for 1-1.2k watts.
I got my 6m - 20m cobweb from a Polish builder. Rated up to 1.5kW PEP.
Apparently manufacturers would rather fold the wire in half again and again rather than roll it up on a form. They should
use their own products.
not sure that your not causing the tangles yourself
Great video Dave! 73 KC9QVE Kokomo,Indiana
And no excuse for this antenna all elements should be wrapped on some kind a spool. And no paperwork. I believe that I would spend my money some place else
KQ4CD Paul ⚓️
Dave you need to do water fasting.
What a freaking abomination.
Someone else should do a video. He sucks. He beats around the bush to much and don't explain anything
He’s 70. Give the guy a break. He knows more about radio than most of us put together. Be thankful someone has made the video at all, but of course, the beauty of TH-cam is if you don’t like it don’t watch. ;) 73’s