cell phone jammer

[John Smith]

Just seen the neatest gadget... it looked like a cigar tube and about
the size of one... when the guy turned it on took out all the cell
phones in the wallmart we were in... I should have asked him more about
it... anyone else seen one of these or construction details?

Warmest regards,
John
--
Watching the cutting edge of yesterday replay--in virtual reality, right
before my eyes--in real time!
Thirty year old technology--wasn't it amazing?

 

[Rene Tschaggelar]

John Smith wrote:

Just seen the neatest gadget... it looked like a cigar tube and about
the size of one... when the guy turned it on took out all the cell
phones in the wallmart we were in... I should have asked him more about
it... anyone else seen one of these or construction details?

An extremely handy gadget when a relative of yours had a
heart attack and a pedestrian tries to call the ambulance
with a mobile phone. Make sure that you really inherit
before activating the jammer.

Rene

 

[John Smith]

I was kicking around the design, a voltage controlled oscillator swept
though a freq range and modulated with white noise should do it--and
sending the output though a buffer and amp... really should be a simple
thing to slap together...

John

"Rene Tschaggelar" <none@none.net> wrote in message
news:42a95f74$1@news1.ethz.ch...

John Smith wrote:

Just seen the neatest gadget... it looked like a cigar tube and
about the size of one... when the guy turned it on took out all the
cell phones in the wallmart we were in... I should have asked him
more about it... anyone else seen one of these or construction
details?

An extremely handy gadget when a relative of yours had a
heart attack and a pedestrian tries to call the ambulance
with a mobile phone. Make sure that you really inherit
before activating the jammer.

Rene

 

[Thomas Magma]

Why would you want to jam cell phones when you can go out to the airport and
jamming commercial aircrafts GPS's and transponders? I don't think the FCC
or FAA really minds at all.

"John Smith" <assemblywizard@gmail.com> wrote in message
news:YVhqe.21$jF5.595086@news.sisna.com...

I was kicking around the design, a voltage controlled oscillator swept
though a freq range and modulated with white noise should do it--and
sending the output though a buffer and amp... really should be a simple
thing to slap together...

John

"Rene Tschaggelar" <none@none.net> wrote in message
news:42a95f74$1@news1.ethz.ch...
John Smith wrote:

Just seen the neatest gadget... it looked like a cigar tube and about
the size of one... when the guy turned it on took out all the cell
phones in the wallmart we were in... I should have asked him more about
it... anyone else seen one of these or construction details?

An extremely handy gadget when a relative of yours had a
heart attack and a pedestrian tries to call the ambulance
with a mobile phone. Make sure that you really inherit
before activating the jammer.

Rene

 

[John Smith]

.... naaa, jamming there might be a problem, I was thinking more of
localized areas where people are just an annoyance with their cell
phones... like turn it on in the theatre you are watching a movie in--or
the library...

John

"Thomas Magma" <somewhere@overtherainbow.com> wrote in message
news:hNiqe.1639577$6l.267941@pd7tw2no...

Why would you want to jam cell phones when you can go out to the
airport and jamming commercial aircrafts GPS's and transponders? I
don't think the FCC or FAA really minds at all.

"John Smith" <assemblywizard@gmail.com> wrote in message
news:YVhqe.21$jF5.595086@news.sisna.com...
I was kicking around the design, a voltage controlled oscillator swept
though a freq range and modulated with white noise should do it--and
sending the output though a buffer and amp... really should be a
simple thing to slap together...

John

"Rene Tschaggelar" <none@none.net> wrote in message
news:42a95f74$1@news1.ethz.ch...
John Smith wrote:

Just seen the neatest gadget... it looked like a cigar tube and
about the size of one... when the guy turned it on took out all the
cell phones in the wallmart we were in... I should have asked him
more about it... anyone else seen one of these or construction
details?

An extremely handy gadget when a relative of yours had a
heart attack and a pedestrian tries to call the ambulance
with a mobile phone. Make sure that you really inherit
before activating the jammer.

Rene

 

[Jim Yanik]

"John Smith" <assemblywizard@gmail.com> wrote in
news:ewlqe.44$TV6.1546355@news.sisna.com:

... naaa, jamming there might be a problem, I was thinking more of
localized areas where people are just an annoyance with their cell
phones... like turn it on in the theatre you are watching a movie in--or
the library...

John

Or when an idiot driver is driving dangerously/negligently while yakking on
their phone.


--
Jim Yanik
jyanik
at
kua.net

 

[Rich The Newsgroup Wacko]

On Fri, 10 Jun 2005 12:05:43 -0700, John Smith wrote:

... naaa, jamming there might be a problem, I was thinking more of
localized areas where people are just an annoyance with their cell
phones... like turn it on in the theatre you are watching a movie in--or
the library...

I think Mr. Smith and Mr. Wesson have already designed the exact right
tool for this particular application...
--
Cheers!
Rich
------
"There was a young girl from Annista
Who dated a lecherous mister.
He fondled her titty,
Got one finger shitty,
Then screwed up his courage and kissed 'er."

 

[Ben Bradley]

On Fri, 10 Jun 2005 08:00:05 -0700, "John Smith"
<assemblywizard@gmail.com> wrote:

I was kicking around the design, a voltage controlled oscillator swept
though a freq range and modulated with white noise should do it--and
sending the output though a buffer and amp... really should be a simple
thing to slap together...

Is this what prompted the "VCO Design" and "VCO Design
Considerations" posts? I'm not sure of the exact range of cell phone
frequencies, but it seems suspicious to me.

John

"Rene Tschaggelar" <none@none.net> wrote in message
news:42a95f74$1@news1.ethz.ch...
John Smith wrote:

Just seen the neatest gadget... it looked like a cigar tube and
about the size of one... when the guy turned it on took out all the
cell phones in the wallmart we were in... I should have asked him
more about it... anyone else seen one of these or construction
details?

An extremely handy gadget when a relative of yours had a
heart attack and a pedestrian tries to call the ambulance
with a mobile phone. Make sure that you really inherit
before activating the jammer.

Rene

-----
http://mindspring.com/~benbradley

 

[John Smith]

Ben:

I was certainly noticing that the vco with a a buffer and amp would
probably do the job!

John

"Ben Bradley" <ben_nospam_bradley@frontiernet.net> wrote in message
news:fhgka1tpd7388pt5msl6qefap52umpaj1a@4ax.com...

On Fri, 10 Jun 2005 08:00:05 -0700, "John Smith"
assemblywizard@gmail.com> wrote:

I was kicking around the design, a voltage controlled oscillator swept
though a freq range and modulated with white noise should do it--and
sending the output though a buffer and amp... really should be a
simple
thing to slap together...

Is this what prompted the "VCO Design" and "VCO Design
Considerations" posts? I'm not sure of the exact range of cell phone
frequencies, but it seems suspicious to me.

John

"Rene Tschaggelar" <none@none.net> wrote in message
news:42a95f74$1@news1.ethz.ch...
John Smith wrote:

Just seen the neatest gadget... it looked like a cigar tube and
about the size of one... when the guy turned it on took out all the
cell phones in the wallmart we were in... I should have asked him
more about it... anyone else seen one of these or construction
details?

An extremely handy gadget when a relative of yours had a
heart attack and a pedestrian tries to call the ambulance
with a mobile phone. Make sure that you really inherit
before activating the jammer.

Rene


-----
http://mindspring.com/~benbradley

 

[Jim Yanik]

Rich The Newsgroup Wacko <wacko@example.com> wrote in
newsan.2005.06.11.01.34.20.106784@example.com:

On Fri, 10 Jun 2005 12:05:43 -0700, John Smith wrote:

... naaa, jamming there might be a problem, I was thinking more of
localized areas where people are just an annoyance with their cell
phones... like turn it on in the theatre you are watching a movie
in--or the library...

I think Mr. Smith and Mr. Wesson have already designed the exact right
tool for this particular application...

Why would you want to *murder* them,instead of just blocking their calls,a
non-violent approach?

--
Jim Yanik
jyanik
at
kua.net

 

[Jim Yanik]

"John Smith" <assemblywizard@gmail.com> wrote in
news:9wtqe.4538$SJ7.5082247@news.sisna.com:

Ben:

I was certainly noticing that the vco with a a buffer and amp would
probably do the job!

John

Why not just a diode-based,band-limited white noise fed to an amp?
You would need one for each cellphone band.

--
Jim Yanik
jyanik
at
kua.net

 

[John Smith]

gesus... that would probably take out the am broadcast band on up...
heck, it might even "jam" sensitive audio amps... now that is going to
cause some real problems...

.... not to even mention how in-efficient it is and the power you would
need to generate enough power to block even one small set of
frequencies--you certainly would start going thorough batteries
quickly... might be best to hook it up to 220V mains!

John

"Jim Yanik" <jyanik@abuse.gov.> wrote in message
news:Xns96728276D924Djyanikkuanet@129.250.170.86...

"John Smith" <assemblywizard@gmail.com> wrote in
news:9wtqe.4538$SJ7.5082247@news.sisna.com:

Ben:

I was certainly noticing that the vco with a a buffer and amp would
probably do the job!

John


Why not just a diode-based,band-limited white noise fed to an amp?
You would need one for each cellphone band.

--
Jim Yanik
jyanik
at
kua.net

 

[Dave]

John Smith wrote:

gesus... that would probably take out the am broadcast band on up...
heck, it might even "jam" sensitive audio amps... now that is going to
cause some real problems...

He did use the word "band limited". I was once surprised when a student
of mine built a noise diode source using a 300mW zener (but really its
an avalanche process) diode. The noise was detectable at 2.2GHz - the
limit of the spectrum analyser.

The problem with amplifying noise is that you need big amps, since the
power/Hz might be small, but if the bandwidth is large, the total power
is high.

... not to even mention how in-efficient it is and the power you would
need to generate enough power to block even one small set of
frequencies--you certainly would start going thorough batteries
quickly... might be best to hook it up to 220V mains!

John

"Jim Yanik" <jyanik@abuse.gov.> wrote in message
news:Xns96728276D924Djyanikkuanet@129.250.170.86...

"John Smith" <assemblywizard@gmail.com> wrote in
news:9wtqe.4538$SJ7.5082247@news.sisna.com:


Ben:

I was certainly noticing that the vco with a a buffer and amp would
probably do the job!

John


Why not just a diode-based,band-limited white noise fed to an amp?
You would need one for each cellphone band.

--
Jim Yanik
jyanik
at
kua.net

 

[Rather Play Pinball]

The better jammers mimic a cell tower. The cell phone latches onto the cell
tower mimicker and of course, gets nowhere... clever, without pumping out
a lot of white noise.

 

[John Smith]

Yes, were would one find the cell handshaking protocol... should be able
to program a pic to run the handshake...

John

"Rather Play Pinball" <123@123.net> wrote in message
news:JSIqe.8531$rt3.706@fe03.lga...

The better jammers mimic a cell tower. The cell phone latches onto
the cell
tower mimicker and of course, gets nowhere... clever, without
pumping out
a lot of white noise.

 

[Jim Yanik]

Dave <nospam@nowhere.com> wrote in news:42ab3040@212.67.96.135:

John Smith wrote:
gesus... that would probably take out the am broadcast band on up...
heck, it might even "jam" sensitive audio amps... now that is going to
cause some real problems...

He did use the word "band limited". I was once surprised when a student
of mine built a noise diode source using a 300mW zener (but really its
an avalanche process) diode. The noise was detectable at 2.2GHz - the
limit of the spectrum analyser.

The problem with amplifying noise is that you need big amps, since the
power/Hz might be small, but if the bandwidth is large, the total power
is high.


... not to even mention how in-efficient it is and the power you would
need to generate enough power to block even one small set of
frequencies--you certainly would start going thorough batteries
quickly... might be best to hook it up to 220V mains!

John

Why not just a diode-based,band-limited white noise fed to an amp?
You would need one for each cellphone band.

--
Jim Yanik
jyanik
at
kua.net

Cellphone(CP) bandwidth is fairly small.And with the low power levels at
the hand-held CP,a great amount of power is not needed,all you need is a
noise floor high enough to cover the received signal at the CP,-not at the
cell site.Breaking one side of the 2-way link is all you need.
You need broadband for CP because of the spread-spectrum methods of
modulation.
Sweeping a VCO is not going to affect spread-spectrum transmissions.

--
Jim Yanik
jyanik
at
kua.net

 

[Jim Yanik]

"John Smith" <assemblywizard@gmail.com> wrote in
news:GPJqe.5240$9A3.10658857@news.sisna.com:

Yes, were would one find the cell handshaking protocol... should be able
to program a pic to run the handshake...

John

"Rather Play Pinball" <123@123.net> wrote in message
news:JSIqe.8531$rt3.706@fe03.lga...

The better jammers mimic a cell tower. The cell phone latches onto
the cell
tower mimicker and of course, gets nowhere... clever, without
pumping out
a lot of white noise.

How would a "mimic" jammer deal with more than one cellphone?
It would have to handle multiple channels simultaneously then.

--
Jim Yanik
jyanik
at
kua.net

 

[John Smith]

.... oh, I think it would, you certainly are not going to concentrate on
making the vco very narrow bandwidth... low Q tank circuit would be
excellent for this case... and of course if the vco's bandwidth is wide
enough--you would not even have to sweep...
.... I was thinking of a "white noise audio generator" as might keep the
phone so confused would not be able to pull out digital signals...

I don't know--never checked at what range of freqs you would have to
cover to catch all phones... but sweep if vco is not wide enough--don't
if it is...

.... however, if you sweep, you would sweep at a very high speed... the
object does not even have to be to completely block the cell
signal--just cause enough havoc to make it unusable...

John

"Jim Yanik" <jyanik@abuse.gov.> wrote in message
news:Xns9672C8580ED7Fjyanikkuanet@129.250.170.86...

Dave <nospam@nowhere.com> wrote in news:42ab3040@212.67.96.135:

John Smith wrote:
gesus... that would probably take out the am broadcast band on up...
heck, it might even "jam" sensitive audio amps... now that is going
to
cause some real problems...

He did use the word "band limited". I was once surprised when a
student
of mine built a noise diode source using a 300mW zener (but really
its
an avalanche process) diode. The noise was detectable at 2.2GHz - the
limit of the spectrum analyser.

The problem with amplifying noise is that you need big amps, since
the
power/Hz might be small, but if the bandwidth is large, the total
power
is high.


... not to even mention how in-efficient it is and the power you
would
need to generate enough power to block even one small set of
frequencies--you certainly would start going thorough batteries
quickly... might be best to hook it up to 220V mains!

John


Why not just a diode-based,band-limited white noise fed to an amp?
You would need one for each cellphone band.

--
Jim Yanik
jyanik
at
kua.net






Cellphone(CP) bandwidth is fairly small.And with the low power levels
at
the hand-held CP,a great amount of power is not needed,all you need is
a
noise floor high enough to cover the received signal at the CP,-not at
the
cell site.Breaking one side of the 2-way link is all you need.
You need broadband for CP because of the spread-spectrum methods of
modulation.
Sweeping a VCO is not going to affect spread-spectrum transmissions.

--
Jim Yanik
jyanik
at
kua.net

 

[John Smith]

Well, your question already makes me think of taking an easier way into
this...

.... however, just guessing, I am sure there is a "hold" protocol where
the tower can hold the phone in a static state--promising to get back to
it--just queue new cell signals and keeps sending each a hold signal...

.... but you are right, a more simplistic approach just to make the
signal unusable to cells in range would be best...

John

"Jim Yanik" <jyanik@abuse.gov.> wrote in message
news:Xns9672C8AA2A377jyanikkuanet@129.250.170.86...

"John Smith" <assemblywizard@gmail.com> wrote in
news:GPJqe.5240$9A3.10658857@news.sisna.com:

Yes, were would one find the cell handshaking protocol... should be
able
to program a pic to run the handshake...

John

"Rather Play Pinball" <123@123.net> wrote in message
news:JSIqe.8531$rt3.706@fe03.lga...

The better jammers mimic a cell tower. The cell phone latches onto
the cell
tower mimicker and of course, gets nowhere... clever, without
pumping out
a lot of white noise.







How would a "mimic" jammer deal with more than one cellphone?
It would have to handle multiple channels simultaneously then.

--
Jim Yanik
jyanik
at
kua.net

 

[keith]

On Sat, 11 Jun 2005 16:49:54 +0000, Jim Yanik wrote:

Rich The Newsgroup Wacko <wacko@example.com> wrote in
newsan.2005.06.11.01.34.20.106784@example.com:

On Fri, 10 Jun 2005 12:05:43 -0700, John Smith wrote:

... naaa, jamming there might be a problem, I was thinking more of
localized areas where people are just an annoyance with their cell
phones... like turn it on in the theatre you are watching a movie
in--or the library...

I think Mr. Smith and Mr. Wesson have already designed the exact right
tool for this particular application...

Why would you want to *murder* them,instead of just blocking their calls,a
non-violent approach?

Kill the jammers? Maybe! I'm not a fan of public use of cell phones, but
they *are* a PITA is many places. In fact I think I've come around to the
anti-driving-while-chatting law side.

....and yes, I do have a cell phone (and no land-line).

--
Keith