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« iRobot iNstitute Lesson 3: Add Custom Hardware to Your Create | Main | 5-Minute Project Video: Old Hard Drive = New Fridge Magnet »

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Anonymous

Or you could get a new phone with a better antenna.

GPE

The www.electrocom.com site mentioned in the video doesn't appear to be correct. It goes to some consulting firm.

Anonymous: I have a newer phone and where I live has very poor reception with the provider I use. An other provider has good reception at my home, but not elsewhere in the city, which is were I use my cell phone more. Tradeoffs.

sherlock

Couple of comments:
1. You start out by removing the bottom of the coffee can. Then you show a different coffee can with the bottom in, and the Pepperidge Farm can with its bottom out. What happened?

2. Perhaps if you cut down on the lead-in diddly-bop stuff you would have had time to show us the Pepperidge Farm can for longer than 1/2 second so we could see the label and hear the name of the product.

3. Maybe the diameter of the hole in the side of the can is important? Never said what it was or how to make it.

You know, most people looking at this are not 14 years old. Think about it.

The_Dark_Knight

Sherlock,

Which seems a fitting name,

some tips to help you on your way:

Question 1:
He says you must remove the bottom of ONE of the cans. so pick one. it doesn't seem to matter which.

Question 2:
The beauty of these internet videos are that if you don't catch something the first time you can go back, watch it again, and pause it if necessary. We can assume by the end of the video that the ""Mystery Pepperidge Farm Pirouettes" tin needs to be the same diameter as the coffee can. So when you are assembling these items just keep that in mind.

Question 3:
I would say the diameter of the hole is very important. I would say that it should be roughly the same size as the piece you are fitting into it. So if you have that piece, which you WILL need in order to complete this project, you can measure it and make the hole accordingly.

and finally, if you aren't 14 years old why would I, a 14 year old, need to tell you all of this?

ps. good work guy. The "electrocom" link does seem to be wrong but all in all an interesting project. I even enjoy the lead-in Diddly-Bob stuff. Gives it a lil flair! :)

Marc

Neat video! You should link to a write-up of the science of how it works. How important is the can size? The hole location? Why? A supplementary in-depth discussion would add a lot to the video.

Ford

If the copper is being used as the actual antenna and the can is just being used as a waveguide, then how long should the copper be? This is a pretty important bit of information that's not given.

Luby Sawkiw

Good project! I used to be involved in ham radio and commercial broadcasting, so I can understand how the antenna can offer a signal gain. However, did Mike Haney say 97 millimeters from the end of the can? Did the 97 mm distance come from a formula or by experimentation? Using wavelength (meters) = 300/Freq. (mhz), wouldn't a distance of 97 mm work out to a frequency of around 1550 mhz? Didn't he say cell phones are up around 1900 mhz? I believe the idea is to put the pickup stub 1/2 wavelength from the closed end of the can, so that the reflected wave will reinforce the next arriving wave. Using 1900 mhz, I get a wavelength of 158 mm and a half wavelength puts this distance at 79 mm, not 97mm. I am not sure of the exact range of cell frequencies being used, but in my radio days working with antennas, I sure enjoyed figuring, measuring and tinkering and then finding out that some other solution worked better in actual practice. The project is a great idea.

Lubi

mike

Ugh - you guys are right - the link was supposed to be shown as http://www.electro-comm.com - I think I only said it out loud and the producers just put it in that way. Sorry.

For a full parts list and diagram, see here: http://www.popsci.com/popsci/how20/4003b56ed315e010vgnvcm1000004eecbccdrcrd.html

Also, this project originally came from Mike Outmesguine, the wireless guru behind SoCalWUG and the author of Wi-Fi Toys. I can attest that he's done the math and tested the design.

Finally, Sherlock, sharp eye: we did do a switcheroo in filming -- because of time and production constraints we soldered together one set of cans and then switched to another set that had the hole pre-drilled. Such are the limitations of video.

Breather Guy

Mike:
Eye protection is important when soldering.
For 900 Hz or 850 Hz phones what would be the best distance?

jd

Couldn't a piece of metal ducting be used instead of the cans? The length can be cut, and the diameter altered. Is the diameter critical? Does it have to be metal? I'm guessing the reflecting bottom might need to be???
I'm thinking of building one for my apartment dwelling daughter. Nice video, but an article explaining why it works would have been nice. This is popular SCIENCE magazine - not popular tinkering! haha

A Effort-maker

I have made an interesting discovery. "Electro-comm" is a distributor. This distributor is only selling items, online and directly, to these qualified buyers (and I quote) "bonafide reseller, systems integrator, cellular retailer, consultant, service provider, qualified self service end user, a government agency or some similar business or agency." I can probably find the equipment somewhere else. There may be those who may not know anything about these areas (myself included, but I do my best) and might not be able to either aquire the items from "Electro-comm" or find where else to get them and what exactly they need. All in all I'm exicted to try this DIY and have high hopes seeing as how I NEED the boost.

Brock

If you can do these tasks in less than 5 minutes, I'll buy you a cell phone....I'll even buy you a new Leatherman or whatever brand of 'multi-tool' you used to cut a perfectly round hole in the side of a coffee can without distorting it in the least. Thanks for another example of disregard. Forget about integrity. Another 5 minutes of wasted bandwidth. I expect more from PopSci....

foss

So i went to wirelessadvisor.com and cant seem to find a detailed map of cell phone towers in my area. Does someone have a more precise link?
Thanks

TomFosseen

Could not find a cable to fit. What should I buy, Need more precise info on this. I have my cans sitting here waiting.

Mark

Thanks for the nice article.The information, that you have provided on the '5-Minute Project Video: The Coffee Can Cellphone Antenna' is totally make sense to us.
I have gone through many blogs, sites and forums which been providing great knowledge about the same, as like recently i was reading something about Antenna on http://www/mobilemark.com, the information that shared here is also great.
I appreciate your effort for supply this type of vital information and sure I'll come again across your blog when you will share something new.

Thanks,

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