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Any good Cell Phone Jammer Schematics

M

Michael A. Terrell

Jan 1, 1970
0
techie_alison said:
In response to their annoying over-confident waffle, or discussing people's
private details in public?


XOR ;-)



--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
G

Gareth

Jan 1, 1970
0
Jasen said:
Does that include Farraday cages?

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."


--
 
F

flank

Jan 1, 1970
0
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
 
F

flank

Jan 1, 1970
0
mc said:
I'm a college teacher, and I deal with problems like this by giving the
students a bit of education about basic politeness. Websurfing and games on
laptops in class are a much bigger problem than cell phones.

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.
 
F

flank

Jan 1, 1970
0
Rich said:
You ought to lay down the law. "Anyone using a cell phone or allowing one
to ring while class is in session will be summarily expelled and receive a
failing grade for the semester."

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.
 
J

John Fields

Jan 1, 1970
0
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.
 
F

flank

Jan 1, 1970
0
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.
 
D

Don Bowey

Jan 1, 1970
0
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

No, but thank you anyhow.

Don
 
D

Don Bowey

Jan 1, 1970
0
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.

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

Don
 
M

mc

Jan 1, 1970
0
ehsjr said:
The fact is, the student was insufficiently considerate
of his classmates, the teacher and the rules to ensure
that his cell phone was off.

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?
 
M

mc

Jan 1, 1970
0
Jasen Betts said:
Does that include Farraday cages?

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

Don Bowey

Jan 1, 1970
0
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.

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

Don
 
M

mc

Jan 1, 1970
0
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 solve these problems.
[/QUOTE]

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.
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 Fields
Professional Circuit Designer

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.
 
M

mc

Jan 1, 1970
0
Why not have the students place their phones in a rack designed for
4. What if the phones in the rack are on and they ring during class?

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.
 
D

Don Bowey

Jan 1, 1970
0
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.
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
 
J

John Fields

Jan 1, 1970
0
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.

---
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.
 
F

flank

Jan 1, 1970
0
Don said:
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.

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.

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?
 
J

John Fields

Jan 1, 1970
0
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?
 
F

flank

Jan 1, 1970
0
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?
 
J

John Fields

Jan 1, 1970
0
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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