Author Topic: How is this legal? (selling cellphone and other radio jammers)  (Read 4166 times)

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Offline snarkysparky

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #25 on: February 19, 2018, 05:44:01 pm »
I want one for those times after lunch when I need to hit the bathroom but the stalls are full of people playing with their smartphones.
 

Offline MasterTech

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #26 on: February 19, 2018, 06:07:33 pm »
For technical reference here is a triband jammer. Basically 3 tuned VCOs turned on and off. Lithium battery on the other side + 3 helix antennas

« Last Edit: February 19, 2018, 06:12:13 pm by MasterTech »
 
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Online Nusa

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #27 on: February 19, 2018, 06:13:48 pm »
https://www.theverge.com/2014/5/1/5672762/man-faces-48000-fine-for-driving-with-cellphone-jammer

I read this story recently where a guy drove and jammed people's smartphones on a daily commute. So I was thinking he probably made his own jammer, but it turns out these jammers are readily available for purchase.

A simple google search netted bunch of sources. The first one being in the US (jammer-store.com) just happily selling you RF jammers. They are even advertised on TV.

You technically can't even sell gear without FCC certification for EMC / EMI testing, yet these guys sell gear made precisely to do what it's not allowed.

What am I missing?

You've made the assumption that US laws actually apply globally. jammer-store.com isn't based in the US (google tells me they're headquartered in Sweden), and they ship from japan, china, taiwan, or korea (that's stated on their site). For the most part, these laws you speak of don't actually apply to them. When you order from them, YOU become the importer and the breaker of applicable laws.
 
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Offline Richard Crowley

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #28 on: February 19, 2018, 06:44:08 pm »
Gear that is identified as "Test Equipment" is apparently exempt from FCC approval.  Even if it is capable of "transmitting" RF.

"Lady Ada" Timor designed and published the plans for a cell phone general-purpose jammer when she was a student at MIT.
You can read about it, see the plans and photos still here online....

http://www.ladyada.net/make/wavebubble/
« Last Edit: February 19, 2018, 06:46:02 pm by Richard Crowley »
 

Offline VK5RC

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #29 on: February 19, 2018, 07:49:09 pm »
A year or so ago, we had a talk given by one of our ACMA compliance officers (i think one of about 4 for Australia!), re cell phone jammers - they (ACMA)  are really are clamping down, cinemas and Taxi drivers seem to be some of the common places.
Whoah! Watch where that landed we might need it later.
 

Offline JoeN

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #30 on: February 19, 2018, 08:13:58 pm »
One wonders if you couldn't create an effective jammer with a spark-gap transmitter.  Cars certainly have a pretty good DC power source.  Then you could play stupid and crazy ("warding off evil spirits, officer") rather than smart and criminal.  :)
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Online helius

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #31 on: February 19, 2018, 09:35:43 pm »
A year or so ago, we had a talk given by one of our ACMA compliance officers (i think one of about 4 for Australia!), re cell phone jammers - they (ACMA)  are really are clamping down, cinemas and Taxi drivers seem to be some of the common places.
Perhaps they could get their priorities straight and start arresting the buffoons who use smartphones in cinemas, ruining it for everybody else.
 

Offline ataradov

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Online rstofer

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #33 on: February 20, 2018, 11:23:36 pm »
Things are changing and even Japan allows the use of jammers in certain public venues.  Churches have tried it in the US but I don't think our laws have caught up.

There are many reasons to block cell phones.  Museums, art galleries, churches, any place where cell phones are obnoxious (just about everywhere).  Just notify the customers with signs at the entrance stating that their phones will be blocked and call it good.
 

Offline apelly

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #34 on: February 21, 2018, 01:07:18 am »
There are many reasons to block cell phones.  Museums, art galleries, churches, any place where cell phones are obnoxious (just about everywhere).  Just notify the customers with signs at the entrance stating that their phones will be blocked and call it good.
I recall hearing about French cinemas trying this out. I believe there were concerns about access to emergency services if the signal was completely blocked. I believe they've settled on a more sophisticated system that selectively blocks calls.

Sorry, I have no citation at hand.
I'd rather a Google clue, link, or some theory than "do this" (generally)
 

Offline rfeecs

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #35 on: February 21, 2018, 01:22:33 am »
I saw a film in this theater last year.  No cell phone reception at all.  The indoor theater is on the other side of the outdoor screen.

 

Online Nusa

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #36 on: February 21, 2018, 01:36:29 am »
Of course you don't need a jammer to kill cell phones if you have a properly shielded room/building to start with. Looks like that might be the case here.
 

Offline JoeN

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #37 on: February 22, 2018, 08:12:37 am »
I saw a film in this theater last year.  No cell phone reception at all.  The indoor theater is on the other side of the outdoor screen.

That's funny and a nice simple solution.  I would think if it is not an active jammer but it is just a Faraday cage like this it would be legal even in the U.S.
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Offline Bassman59

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #38 on: February 22, 2018, 03:42:38 pm »
That's funny and a nice simple solution.  I would think if it is not an active jammer but it is just a Faraday cage like this it would be legal even in the U.S.

Well, yeah, because the licenses regulate transmission. You don't need a license to receive anything, which means (among other things) that there's no guarantee that you can receive a given signal. Nothing in any building code says that the structure has to be transparent to RF!
 

Offline Richard Crowley

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #39 on: February 22, 2018, 04:56:32 pm »
You don't need a license to receive anything,
Actually, at least in the US, it is not legal to receive certain transmissions, namely mobile phone.  Note that most legal gear sold in the US is made with intentional gaps in coverage of the cell phone bands.  Unless of course, you are using a proper mobile phone for its intended purpose. There are exemptions for military, law-enforcement, etc.
 

Offline Ice-Tea

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #40 on: February 22, 2018, 05:00:51 pm »
Yes. A Chinese company was exporting cellphone jammers to US for years, and it was fined by FCC tens of millions of dollars in 2016.

Heh.  How is that payment coming along?

Don't know, it was a fairly big private company, and it made headlines in China. I guess either the company paid the fine and sell to government/military, or the company said F you and withdrew from US market.

My guess: close the shop, open a new one three doors down the road, come up with a new brand name, print new stickers, done.

Offline blueskull

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #41 on: February 23, 2018, 07:35:17 am »
My guess: close the shop, open a new one three doors down the road, come up with a new brand name, print new stickers, done.

It's a bit hard for them to do so, they are too big to hit and run.  They are a fairly large cellphone jammer manufactuer in China and they supply Chinese government and schools in large quantity.
« Last Edit: February 23, 2018, 09:50:46 am by blueskull »
 

Offline Red Squirrel

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #42 on: February 23, 2018, 09:49:55 am »
That's funny and a nice simple solution.  I would think if it is not an active jammer but it is just a Faraday cage like this it would be legal even in the U.S.

Well, yeah, because the licenses regulate transmission. You don't need a license to receive anything, which means (among other things) that there's no guarantee that you can receive a given signal. Nothing in any building code says that the structure has to be transparent to RF!

I wonder if they will ever try to stick something like that in building code.  Especially with all the spy stuff in devices now days like smart TVs and all that stuff.  The signal has to get out to reach the mothership somehow!   Of course they'll try to pass it as some kind of safety thing, like if you can't use your cell in your house you can't call 911, since most people don't have landlines anymore.
 

Offline Lord of nothing

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Re: How is this legal? (selling cellphone and other radio jammers)
« Reply #43 on: March 12, 2018, 02:09:09 pm »
How about Jam Digital Transmissions by Random Package?
Here we have an Company who realy piss me off.  :box:
Made in Japan, destroyed in Sulz im Wienerwald.
 


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