cell phone jammer

[Jim Yanik]

"John Smith" <assemblywizard@gmail.com> wrote in
news:TeLqe.5247$SO5.11362430@news.sisna.com:

... 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...

You're not going to make an oscillator with that wide an output signal.
It still has to be band filtered to prevent interference with other
frequencies used by emergency and other services,too.

... 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...

The carrier levels are low enough that you can swamp them with white noise.
(for a *short* range)

Easier,cheaper,SIMPLER;remember the KISS principle.

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...

well,there's ~800 Mhz band,a 2.5 Ghz band,nad one other that I can't
recall.You are not going to get a single VCO that would cover all CP
bands;even military jammers use multiple signal sources.One single antenna
would not even work for all the CP bands.

IIRC,most of the newer phones use 2.5 Ghz.

... 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

--
Jim Yanik
jyanik
at
kua.net

 

[Jim Yanik]

keith <krw@att.bizzzz> wrote in
newsan.2005.06.12.02.51.03.360431@att.bizzzz:

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?

No,he meant to murder the annoying or unsafe CP users.

Maybe! I'm not a fan of public use of cell phones,
but they *are* a PITA is many places.

Yes,but that still does not condone murdering them.

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).

Funny,but my experience with last years 3 Hurricanes in Florida shows that
having a land-line is a good thing.That's the only phone that worked after
Charlie.CPs were out of service,and many cells were down due to loss of
electric power or damage.

--
Jim Yanik
jyanik
at
kua.net

 

[Mark Zenier]

In article <9wtqe.4538$SJ7.5082247@news.sisna.com>,
John Smith <assemblywizard@gmail.com> wrote:

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

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.

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

But you have the frequencies wrong, (and it's not in my interest to
tell you the correct ones).

Mark Zenier mzenier@eskimo.com Washington State resident

 

[Mac]

On Sun, 12 Jun 2005 04:40:27 +0000, Jim Yanik wrote:

keith <krw@att.bizzzz> wrote in
newsan.2005.06.12.02.51.03.360431@att.bizzzz:

[snip]

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).


Funny,but my experience with last years 3 Hurricanes in Florida shows that
having a land-line is a good thing.That's the only phone that worked after
Charlie.CPs were out of service,and many cells were down due to loss of
electric power or damage.

Interesting. After the Loma Prieta Earthquake (the one that interrupted
the world series) in 1989, Landlines were almost universally down, and the
only way people could talk was via cell phone.

I guess different disasters have different symptoms, so to speak.

--Mac

 

[John Smith]

.... this looks like it is on the right track...
http://www.thespystore.com/videocounter.htm

John

"John Smith" <assemblywizard@gmail.com> wrote in message
news:jY5qe.263$eq7.11438144@news.sisna.com...

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?

 

[John Smith]

Jim:

Actually, if the rf generated is wide enough, just use a diode noise
generator as a signal source, with two or three bandpass filters, buffer
and amp each band feeding it to its separate antenna... just might
work... or, if most cell phones are on just one band--just filter for
that band...

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

 

[keith]

On Sun, 12 Jun 2005 04:40:27 +0000, Jim Yanik wrote:

keith <krw@att.bizzzz> wrote in
newsan.2005.06.12.02.51.03.360431@att.bizzzz:

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?

No,he meant to murder the annoying or unsafe CP users.

Yes I see that now (I reread the thread). Rich is just such a pacifist,
eh?

Maybe! I'm not a fan of public use of cell phones,
but they *are* a PITA is many places.

Yes,but that still does not condone murdering them.

Certainly not. I'm not for jamming them either. If you don't want them
used in your theatre, simply make it like any other large building.
Metal roofs and walls seem to turn my CP reception to trash in most
buildings. ...not that I care much.

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).


Funny,but my experience with last years 3 Hurricanes in Florida shows
that having a land-line is a good thing.That's the only phone that
worked after Charlie.CPs were out of service,and many cells were down
due to loss of electric power or damage.

It differs. I'm not in line for any hurricanes, nor earthquakes (though
the latter is has a higher probability). I just got fed up with the
*expen$ive* land line here. Two cell phones are cheaper than one
land-line (within $10 without long distance charges).

Maybe if I lived in the swamp I'd feel differently. ;-)

--
Keith

 

[John Smith]

I have a 1.5KW magnetron from a commercial microwave oven, hooked up to
a sloppy waveguide which exhibits multiple resonances and ran out into
space would probably have the effect of jamming most if not all cell
phone freqs--I think the output is pretty dirty and running off of a
unfiltered/unregulated supply the output should be all over the band and
spanning tens if not hundreds of Mhz with the related harmonics...

John

"John Smith" <assemblywizard@gmail.com> wrote in message
news:jY5qe.263$eq7.11438144@news.sisna.com...

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?

 

[Jim Yanik]

"John Smith" <assemblywizard@gmail.com> wrote in
news:XXmre.50$9r3.2835571@news.sisna.com:

I have a 1.5KW magnetron from a commercial microwave oven, hooked up to
a sloppy waveguide which exhibits multiple resonances and ran out into
space would probably have the effect of jamming most if not all cell
phone freqs--I think the output is pretty dirty and running off of a
unfiltered/unregulated supply the output should be all over the band and
spanning tens if not hundreds of Mhz with the related harmonics...

John

Not all cellphones use the 2.5Ghz band.
Also,without a decent antenna,you would radiate a directional signal.
Note that CP towers use multiple antennas to get wide coverage.

And with that sort of transmission,I suspect you'd interfere with enough
civil and military receivers that the FCC (or US military) would locate and
come down upon you fairly quickly.

--
Jim Yanik
jyanik
at
kua.net

 

[John Smith]

Jim:

Yes, the waveguide/horn would have to point up at a cone, with the
aperture spacing between horn and cone somewhere near the desired freqs
to produce a roughly omni-directional signal...

John

"Jim Yanik" <jyanik@abuse.gov.> wrote in message
news:Xns9674BC027DF76jyanikkuanet@129.250.170.84...

"John Smith" <assemblywizard@gmail.com> wrote in
news:XXmre.50$9r3.2835571@news.sisna.com:

I have a 1.5KW magnetron from a commercial microwave oven, hooked up
to
a sloppy waveguide which exhibits multiple resonances and ran out
into
space would probably have the effect of jamming most if not all cell
phone freqs--I think the output is pretty dirty and running off of a
unfiltered/unregulated supply the output should be all over the band
and
spanning tens if not hundreds of Mhz with the related harmonics...

John

Not all cellphones use the 2.5Ghz band.
Also,without a decent antenna,you would radiate a directional signal.
Note that CP towers use multiple antennas to get wide coverage.

And with that sort of transmission,I suspect you'd interfere with
enough
civil and military receivers that the FCC (or US military) would
locate and
come down upon you fairly quickly.

--
Jim Yanik
jyanik
at
kua.net

 

[Ken Taylor]

Hopefully you'd be the first (and only) one to look up and see if it was
working.

Ken

"John Smith" <assemblywizard@gmail.com> wrote in message
news:CMore.69$YE6.3488887@news.sisna.com...

Jim:

Yes, the waveguide/horn would have to point up at a cone, with the
aperture spacing between horn and cone somewhere near the desired freqs to
produce a roughly omni-directional signal...

John

"Jim Yanik" <jyanik@abuse.gov.> wrote in message
news:Xns9674BC027DF76jyanikkuanet@129.250.170.84...
"John Smith" <assemblywizard@gmail.com> wrote in
news:XXmre.50$9r3.2835571@news.sisna.com:

I have a 1.5KW magnetron from a commercial microwave oven, hooked up to
a sloppy waveguide which exhibits multiple resonances and ran out into
space would probably have the effect of jamming most if not all cell
phone freqs--I think the output is pretty dirty and running off of a
unfiltered/unregulated supply the output should be all over the band and
spanning tens if not hundreds of Mhz with the related harmonics...

John

Not all cellphones use the 2.5Ghz band.
Also,without a decent antenna,you would radiate a directional signal.
Note that CP towers use multiple antennas to get wide coverage.

And with that sort of transmission,I suspect you'd interfere with enough
civil and military receivers that the FCC (or US military) would locate
and
come down upon you fairly quickly.

--
Jim Yanik
jyanik
at
kua.net

 

[John Smith]

Geesh!

I wasn't advocating building one, just was pointing out that the jamming
is NOT difficult, or obtaining GREAT jamming power...

you would have to have a about a 300 ft extension cord on that thing
anyway, I certainly would NOT want to be around it... LOL!

Honey, I microwaved the kids!!!!

Warmest regards,
John

"Ken Taylor" <ken123@xtra.co.nz> wrote in message
news:2Lpre.7057$U4.1016681@news.xtra.co.nz...

Hopefully you'd be the first (and only) one to look up and see if it
was working.

Ken

"John Smith" <assemblywizard@gmail.com> wrote in message
news:CMore.69$YE6.3488887@news.sisna.com...
Jim:

Yes, the waveguide/horn would have to point up at a cone, with the
aperture spacing between horn and cone somewhere near the desired
freqs to produce a roughly omni-directional signal...

John

"Jim Yanik" <jyanik@abuse.gov.> wrote in message
news:Xns9674BC027DF76jyanikkuanet@129.250.170.84...
"John Smith" <assemblywizard@gmail.com> wrote in
news:XXmre.50$9r3.2835571@news.sisna.com:

I have a 1.5KW magnetron from a commercial microwave oven, hooked
up to
a sloppy waveguide which exhibits multiple resonances and ran out
into
space would probably have the effect of jamming most if not all
cell
phone freqs--I think the output is pretty dirty and running off of
a
unfiltered/unregulated supply the output should be all over the
band and
spanning tens if not hundreds of Mhz with the related harmonics...

John

Not all cellphones use the 2.5Ghz band.
Also,without a decent antenna,you would radiate a directional
signal.
Note that CP towers use multiple antennas to get wide coverage.

And with that sort of transmission,I suspect you'd interfere with
enough
civil and military receivers that the FCC (or US military) would
locate and
come down upon you fairly quickly.

--
Jim Yanik
jyanik
at
kua.net

 

[Ken Taylor]

"John Smith" <assemblywizard@gmail.com> wrote in message
news:YXsre.104$BH4.5751980@news.sisna.com...

Geesh!

I wasn't advocating building one, just was pointing out that the jamming
is NOT difficult, or obtaining GREAT jamming power...

you would have to have a about a 300 ft extension cord on that thing
anyway, I certainly would NOT want to be around it... LOL!

Honey, I microwaved the kids!!!!

Warmest regards,
John

Warmest many things...

There were so many suggestions less than practical it was hard to figure out
who was just taking the piss.

Cheers.

Ken

 

[Jim]

"Jim Yanik" <jyanik@abuse.gov.> wrote

so,instead of economical short-range jamming,those business or property
owners must engage in expensive re-building in order to block the CP
signals? Why place such a costly burden on them? The very nature of cell-
phones makes jamming only possible for short ranges,thus it would not be
any widespread interference.

I did a search and I found Cellphone jammers on the internet for sale to
police and federal agencies.

As I recall, there is a high power one SWAT teams like to use since it
jams several square miles and cuts commumication between people they are
after and any possible outside people posed to help in escapes and such.

Lower power versions cover a single building, more or less, depending on
what's in the walls and so on.

Of course, private citizens can not buy these things legally, but I
imagine there are ways.


Jim

 

[Rich Grise]

On Mon, 27 Jun 2005 11:39:02 -0700, Andy wrote:

PS. Sure it is illegal. Sure the FCC won't like it.
and, no, I really don't care, either......

Then I suggest you go back to masturbation class.

Good Luck!
Rich

 

[Brad Albing]

Rich Grise wrote:

Then I suggest you go back to masturbation class.

Good Luck!
Rich

Ooo! They have classes for that?!

 

[Ken Taylor]

"Brad Albing" <itza.secret@none-of.yer-bidness> wrote in message
news:42c407b3$1@news.cle.ms.philips.com...

Rich Grise wrote:

Then I suggest you go back to masturbation class.

Good Luck!
Rich


Ooo! They have classes for that?!

For those who can't find it.......

Ken

 

[Jim Douglas]

I have a PHD in weenie whacking, chicken chokeing, pulling the putz, yanking
my doodle!

What other terms are they for this wonderful act of self pleasure?


"Rich Grise" <eatmyshorts@doubleclick.net> wrote in message
newsan.2005.06.29.22.52.08.144725@doubleclick.net...

On Mon, 27 Jun 2005 11:39:02 -0700, Andy wrote:

PS. Sure it is illegal. Sure the FCC won't like it.
and, no, I really don't care, either......

Then I suggest you go back to masturbation class.

Good Luck!
Rich