Probably beyond the abilities of a typical hobbyist: http://www.ladyada.net/make/wavebubble/index.html but since this is Hacker news.
Personal Cell Phone Jammer, $27.41
21–30 of 56 posts
Re: Personal Cell Phone Jammer, $27.41
#22Instead of jamming the signal, how about spoofing the various protocols (i.e. make a micro-cell), but one that will connect all calls with silence. Would take much less energy, since all you need is to be slightly stronger than the cell tower, plus you don't need to transmit all the time, just when there is a call. For extra points, detect and forward calls to 911.
Huh? How exactly did you conclude that it would take less energy to build a fully functional mobile cell phone tower that supports a variety of incompatible protocols, all of which are secured with non-trivial encryption?
Even without the encryption, it is extremely difficult to demodulate a GSM signal
Re: Personal Cell Phone Jammer, $27.41
#23Instead of jamming the signal, how about spoofing the various protocols (i.e. make a micro-cell), but one that will connect all calls with silence. Would take much less energy, since all you need is to be slightly stronger than the cell tower, plus you don't need to transmit all the time, just when there is a call. For extra points, detect and forward calls to 911.
Huh? How exactly did you conclude that it would take less energy to build a fully functional mobile cell phone tower that supports a variety of incompatible protocols, all of which are secured with non-trivial encryption? Even without the encryption, it is extremely difficult to demodulate a GSM signal
Perhaps you have a different meaning of the word energy? It will certainly take less radio energy to do what I suggested.
And as for GSM, have a look at http://mobile.slashdot.org/story/09/08/17/0014235/Open-Sourc...
Re: Personal Cell Phone Jammer, $27.41
#24Earlier quoted context omitted.
And for good reason. Who wants to have their cell phone rendered useless just because they happen to be standing too close to someone who decided they're more important than everyone else around them.
Similarly, it's a good thing dangerous chemical kits are outlawed in the US. Who wants to have their house burned down just because they happen to be living too close to someone who decided they're more important than everyone else around them? update: Hey, why am I being voted down? Not trying to be a douchebag here. I really do view EM freedom as strongly correlated with normal-speech freedom. "Pirate" radio statio…
1) Unless you're really trying, it's pretty difficult to burn down the neighborhood with a science kit. When using a cell phone jammer it's pretty hard not to affect all the people around you. That's kinda the point. Now, if you don't want cell phones used in some place that you own, then paint the walls with signal-blocking paint.
2) Have you tried to buy a chemical kit lately? They took out all the fun stuff years ago.
Re: Personal Cell Phone Jammer, $27.41
#25Earlier quoted context omitted.
Similarly, it's a good thing dangerous chemical kits are outlawed in the US. Who wants to have their house burned down just because they happen to be living too close to someone who decided they're more important than everyone else around them? update: Hey, why am I being voted down? Not trying to be a douchebag here. I really do view EM freedom as strongly correlated with normal-speech freedom. "Pirate" radio statio…
1) Unless you're really trying, it's pretty difficult to burn down the neighborhood with a science kit. When using a cell phone jammer it's pretty hard not to affect all the people around you. That's kinda the point. Now, if you don't want cell phones used in some place that you own, then paint the walls with signal-blocking paint. 2) Have you tried to buy a chemical kit lately? They took out all the fun stuff years…
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Re: Personal Cell Phone Jammer, $27.41
#26Earlier quoted context omitted.
What do you mean? That the device will make you sick or somebody else will beat you up?
You are interfering with the ability of others to communicate, it is the same as gagging everybody around you, which is about as rude as you could possibly get. When somebody wonders out loud why their cell doesn't work, especially if the call they need to make is an urgent one and you whip out your 'gadget' be prepared for nasty stuff to happen to you. Interfering with any kind of communication is about as low as yo…
Talking loudly on a cell phone, oblivious to the tranquility you destroy around you -- that will come pretty close.
I'd like to think restaurant patrons and mass transit commuters had consideration for others (and the presence of mind to talk quietly) but they often don't. Jamming is probably not a good solution, though.
Re: Personal Cell Phone Jammer, $27.41
#27These are apparently illegal to use in the U.S. http://www.nytimes.com/2007/11/04/technology/04jammer.html
And for good reason. Who wants to have their cell phone rendered useless just because they happen to be standing too close to someone who decided they're more important than everyone else around them.
This is especially true in emergencies.
Re: Personal Cell Phone Jammer, $27.41
#28Earlier quoted context omitted.
Huh? How exactly did you conclude that it would take less energy to build a fully functional mobile cell phone tower that supports a variety of incompatible protocols, all of which are secured with non-trivial encryption? Even without the encryption, it is extremely difficult to demodulate a GSM signal
Perhaps you have a different meaning of the word energy? It will certainly take less radio energy to do what I suggested. And as for GSM, have a look at http://mobile.slashdot.org/story/09/08/17/0014235/Open-Sourc...
Perhaps he interpreted your comment to mean "less energy for the hacker to build" rather than "less battery power for the device to operate."
Re: Personal Cell Phone Jammer, $27.41
#29Does selling products on HN conform with the TOS?
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Re: Personal Cell Phone Jammer, $27.41
#30Earlier quoted context omitted.
It seems unlikely that the poster is the one selling this item. It seems more likely that the reason for posting this was to show that you can in fact now buy cell phone jammers for only a few dollars. This is quite interesting whether or not you actually want to buy one :)
While I'm not begrudging, it should be noted that DX links ending with ~r. and a number are affiliated to a particular user's account.
> Selling products?
If they're interesting products, I think that's cool. We're capitalists here:-) No spam, though, of course.
Affiliate links?
Why not, if it's an interesting product? I don't begrudge one of us making a bit of cash for showing us something cool. On the other hand, if someone's spamming, throw the book at them! It's pretty clear that 'frisco' is a user who participates in this site and is not a spammer, though.