Any good Cell Phone Jammer Schematics

The whole paragraph refers to the operation of transmitters, so I would guess not, but I'm not a lawyer.

See below:

"The operation of transmitters designed to jam or block wireless communications is a violation of the Communications Act of 1934, as amended ("Act"). See 47 U.S.C. Sections 301, 302a, 333. The Act prohibits any person from willfully or maliciously interfering with the radio communications of any station licensed or authorized under the Act or operated by the U.S. government. 47 U.S.C. Section 333. The manufacture, importation, sale or offer for sale, including advertising, of devices designed to block or jam wireless transmissions is prohibited. 47 U.S.C. Section 302a(b). Parties in violation of these provisions may be subject to the penalties set out in 47 U.S.C. Sections

501-510. Fines for a first offense can range as high as $11,000 for each violation or imprisonment for up to one year, and the device used may also be seized and forfeited to the U.S. government."

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To reply to me directly:

Replace privacy.net with: totalise DOT co DOT uk and replace me with
gareth.harris

Don, What do you know about me that you can comment about how I handle cell phone usage in the classroom? And who do you think you are that you will accuse a total stranger of being cowardly? You are incorrect for no other reason that you know nothing about your subject. Let's please be civil.

flank

I have concocted many ways of discouraging cell phone usage in class and in lab. The problem I have is that I don't want to waste time on it. I have tried using the embarrassment technique, the "throw-you-out-of-class" threat, the reminder at the start of each lecture, and I have spoken to the students individually about how disruptive the ringing is. All of these methods are a waste of class time. I think a jammer would be justified in a classroom, and in many other public settings.

What you and most others in this thread fail to understand is how much energy it takes to implement such harsh rules, and how disruptive it is to the class. I go to lecture to teach electrical engineering courses; I do not want to waste time being a heavy-handed disciplinarian. Any teacher who is reckless enough to declare that any cell phone use in the classroom will result in explusion is going to find him/herself spending many hours dealing with the appeals process in place at any college. A jammer would easily solve these problems.

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Why not have the students place their phones in a rack designed for
that purpose as they enter class and retrieve them when they leave?

John, The reason I believe that jammers are acceptable in classrooms is that classrooms should be dedicated to teaching and learning. Now consider the implementation of your idea, and how it would/might affect the learning environment.

1. Who is going to make the rack?
2. Why would a student put his cell phone there? And if he doesn't, do we go back into punishment mode? If so, why bother with the rack?
3. What about phone stealing?
4. What if the phones in the rack are on and they ring during class?
5. What about students who leave their phones behind?

None of these will improve the learning environment. All of them take attention away from teaching and learning. Your idea just places more attention on the cell phones. And the fact that they are getting so much attention is the problem in the first place. I think jammers are appropriate in the classroom.

No, but thank you anyhow.

Don

You have *threatened* but a threat with no follow-through is worse than useless; it teaches that there is NO threat.

Don

If you think that all people of good character have perfect memories and never forget to do anything they ought to do, you must never have done any mathematics.

But I've said this before and it hasn't soaked in.

My students are not my enemies. I do not hate them. I do not want to accuse them of faults they don't have. I *do* want them to generally have their cell phones on when they go around campus; it contributes to their safety. I understand that occasionally they may forget to turn them off upon entering the classroom. If this becomes a problem, I would start explicitly saying, "Turn your cell phone off now," at the beginning of every lecture.

I would object very strenuously to a student making or taking a call in class. A single ring, to which the student responds by immediately turning the phone off, is not a serious offense.

Now... Who wants to work for me vs. working for my critics here?

I think they meant "block" as a synonym for "jam." The FCC doesn't have jurisdiction over things that don't emit RF.

As someone else pointed out, so would a nuclear blast, but neither is a correct option.

Don

Well said!

But there are a couple of *really big* reasons for not wanting a jammer, even if it were legal. One is safety. What if there's a fire, or an injury (always a real risk in EE labs), or a tornado, or somebody comes in and takes hostages? We don't want the students having to scramble to find a land line phone and then work through its dialing codes, which are unfamiliar to them.

The other is that we *use* cell phones at work. Usually, the way I get in touch with my lab technicians is by dialing their cell phone. They can be anywhere on campus. Dialing their office, or simply going there, wouldn't be as effective.

That's a very good idea. It's what's done in courtrooms. The other possibility would be for the lecturer to announce that it's time to turn off cell phones.

Now *that* is a real problem at the local court house, I'm told. That's why I would favor simply reminding everyone, at the beginning of class, to get out their cell phones and turn them off.

BTW, everybody here seems to assume that there is no legitimate use for a cell phone anywhere near a classroom. Falsch. We use them all the time for work-related purposes.

Obviously, as with some of your students, you are unable to learn about some subjects. What you *think* about jammers is wrong, as their use is illegal.

You get a FAIL.

Don

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Regardless of what you may think, they\'re illegal.

The problem with jammers is that their area of coverage isn\'t easy
to limit, and someone with a legitimate reason to use a cell phone
but within the area the jammer "spills over" into would be prevented
from using their phone.

Possibly the easiest way out for everyone would be to do what mc
suggested; merely tell your students to turn off their cell phones
at the beginning of every class.

Thanks for the grade. If the need for cell phones is so great, why not allow the teacher a cell phone, the number of which is given to all students. They can then give this number to their emergency contacts. Of course, most calls are not related to emergencies.

So, consider this, classrooms are painted with a special paint which has metallic flakes. This, along with metal window screens, produces a Faraday cage, and no signals can enter the room? Is this okay? It is legal. And if it is okay and legal, and it clearly intended to block cell phone usage, why is jammer illegal?

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I think it\'ll take more than than just metallic flake to do it.

_Active_ jammers are illegal because the Communications Act of 1934
says so.

I agree that the metallic flake concept is simplistic. And I also agree that if active jammers are illegal, then they shouldn't be used. But my question remains...If cell phone communication in the classroom can be blocked legally, using a passive system, would it then be acceptable?

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As long as everyone understands that they\'ll be in what\'s
essentially an RF screen room, I don\'t see any problem with it.