OneStudPuppy: Awesome. This project is one of the reasons I became a ham. I like to try off the walk ideas and share the try and see idea.
Bill Cavotta: I guess this was a fun exercise and no offense, but from the title of the video I thought the coffee can would be the radiator of the antenna. As stated by someone earlier, this is pretty much a 1/4 wave ground plane. Just sayin......
purplemutantas: I just built this antenna today. It works better than my Ed Fong J pole! It's pretty amazing what a coffee can and coat hanger can do! We are going to be doing some simplex practice on our local new operator/tech net. I may have to stick my coffee can up on my mast and see how that works out.
Thanks for the video Dave. 73
purplemutantas: What would you be using for the ground plane?
purplemutantas: If you are using wires at the holes, you would be making a 1/4 wave ground plane antenna. So your wires would need to be a 1/4 wavelength in length. As far as I know longer than a 1/4 wave would work too.
The can/wires aren't a support. They form the ground plane.
purplemutantas: Simple. It's just a quarter wavelength element. So just calculate the wavelength at your chosen frequency and divide by 4.
It's pretty simple stuff. Stuff you really aught to know before you start building antennas. Dave has a great video on dipoles. Check that out. It will give you some antenna fundamentals.
purplemutantas: I just had another thought about cans. Coffee cans are number 10 cans. Other things come in number 10 cans. Tomatoes for example.
purplemutantas: The coffee I buy comes in metal cans! MJB still uses metal. I have a newly emptied coffee can. I am going to have to try making one of these. I will also have to take a look at the dual band coffee can antenna. It would be interesting to see how the coffee can antenna compares to my Ed Fong J pole
Celso Lina Da Silva: Please could send me by e mail all measures of antenna metal pot. even that was not clear to me the measure.
FannyAckin: does it work better with decaff
bill ethier: Do you think your cable length had something to do with your element length? I have stuck a 19 inch piece of copper wire in my portables BNC connector and have hit repeaters 25 miles away or so. How about doing a video on portable antenna experiments/ projects... alot less simple than mine though
Nolan Rollo: I didn't see anyone comment on this about the filing but the first day I used a metal file in front of an electrician I got yelled at because I pulled the file back against the metal. If you push (cut) and lift up (instead of sliding back up on the edge of the metal) you won't flatten down the teeth on the file. :)
therealmylesracing: Dave great job on another project! Another happy follower. "Can" u guest amate how many watts it could handle? Thanks
TREE HUGGAH: BRAVO!!!!
what a great project,you should patent that idea.
Fred Cousins: Very good construction- however the coffee tin will also do double duty as the matching part of a 5/8 wave vertical. The concept is patented as the "resonant re-entrant cavity whip antenna". October 1988 73 magazine has a practical antenna project using a small 30 in whip and a large juice can. You keep both ends of can intact - the end of the whip is fed from the bottom of the can and the feed is about a 1/4 way up the can side. The whip extends through a hole in the top.
Gabriel Sierra: My two cents; Some epoxy can be deposited at the can/SO-239 junction to both protect the connector and avoid water from filtering at the junction. Nice project!
wx9dx: With a Field strength meter look at the RF field of your coffee can antenna. Then set the Meter to mid point. Now make the same antenna on a washtub. At the same distance from the antenna, it will peg the RF meter when on a washtub. Showing a big increase in RF field. the ground under the antenna wants to be 5 % bigger than a 1/4 wave.On two meters that is about a 20.5" radius circle. Also look for an X=0 for where it is resonate, set swr with small coil to ground.
Jimmy, ARRL TC, WX9DX
wx9dx: Thanks for a cool project for emergencies.
Stefan Terblanche: i have done this using a coffee can but place the radiator on the inside and make it a 1/4 wave antenna for vhf and uhf and you have a directional antenna aim not done jet still doing some testing.
John Zenick: You could also make a dual band 2m/440 version of this antenna pretty easily.
John Zenick: The round pizza sheets that you can buy could work too...
yapyap66: a step bit, use at own risk :)
Bernie Edwards: cool idea....I'm going to give it a try!
kernowrock555: Women say..us men can't "Multi-task" !....... But just look at the skills from a 3 handed solderer!! :)
Nick Leijenhorst: Hey Dave, amazing channel you got here! I was just wondering... Why do you need impedance in an antenna? Or is it the impedance in the connector?
MarvinMcGill: What kind of bit did you call that gold 1? Will it work for making a hole in the top of the van roof for a MNO mount?
vetham100: i am going to use a folgers can, i want my antenna to be strong :)
gegarpa123: Could you indicate the size of the jar?
in project description
To the public is not English
Joel Tan: For instances, if i am using a 4 copper wire as a base support for the 4 holes in the SO239 socket, what is the differences of using a 4 copper wire or a coffee can as a base support? Does the base height matters if i am constructing a 433MHz antenna.
I was about to ask about the same question as the comment below.
TheLioncave: Any idea how to determine the length of the vertical element if i am to make a 433Mhz antenna using this idea?
Ken Nies: You can purchase unused clean paint cans from Home Depot for less that $5 cheaper than driving all over the place trying to find coffee in a can. You can even order them online and have them shipped to your door. I bet the quart size cans would work well for a 2.4 GHZ antenna. Apparently youtube does not want to let me post the link Home Depot's page I went there and searched for new empty paint cans.
Adam Dickson: you could always just solder the wire into a pl259 no need for a coffee can then easier for handheld use
Dave Tadlock: I used 60/40 rosin-core solder. You can also use a one gallon paint can instead of a coffee can. Thanks for watching and 73! :)
Alford Santee: Nice I followed these direction and made my own ! I used a 1 gallon paint can!!
Bass Assassin: Would you email me what I need to make this I want to build one firstname.lastname@example.org
Brian Shriver: Very cool project. I have to get an analyzer like that.
purplemutantas: large coffee can's aren't that good for 2.4 Ghz waveguide antennas, they are far too wide. Soup cans or cookie cans work better. Both my cantennas are made from cookie cans.
purplemutantas: The coffee I drink comes in a metal can!
Tianyi Xie: Dave you are wasting this coffee can. It can be made into a 2.4 GHZ cantenna.
James Wood: My Maxwell house coffee cans are metal...
Dave Tadlock: After mounting the antenna outdoors on 10' of PVC pipe I found that the vertical element needed to be a little longer. When finished tuning the vertical element it ended up being 25-1/4" (64.1 cm).
joksonu1: Just wanted to say thanks for what you do for the hobby with your projects and videos. I used your video for a guide for the 40/80 Meter Inverted V. Works just as well as my Alpha Delta DX-B sloper and the Inverted V has less noise on every band. I can't wait to try this one! Thanks again and 73. KC8YTP
Dave Tadlock: That's a good idea. I left the insulation on and so don't have too much of a sharp tip but still a good idea. Thanks for watching and 73! :)
Dave Tadlock: That's a a very good tip. I did have some rough edges that took a bit to clean up. Thanks for watching and 73! :)
VE2ZAZ: Some of the baby milk formula powders still ship in metal cans.
slamdvw: A safety tip: put a wire nut in the end of the radiator to eliminate the sharp point... and make it easier to see.