Searching \ for '[EE]: How to jamm a cell phone, and going offtopic' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: techref.massmind.org/techref/microchip/devices.htm?key=pic
Search entire site for: 'How to jamm a cell phone, and going offtopic'.

Exact match. Not showing close matches.
PICList Thread
'[EE]: How to jamm a cell phone, and going offtopic'
2001\03\23@090235 by t F. Touchton

flavicon
face
part 1 3134 bytes content-type:text/plain; charset=us-asciiThis brings to mind a military system I heard about, but could never find any
info on.  Supposedly, someone has developed a communication system based on
wavelength that prevents reception after a certain distance.  I can't picture
the physics of this in my brain.

Has anyone out there any knowledge of this?


|--------+--------------------------->
|        |          Bond Peter       |
|        |          S-petbond1       |
|        |          <Peter.s.Bond@MOT|
|        |          OROLA.COM>       |
|        |                           |
|        |          03/23/01 08:56 AM|
|        |          Please respond to|
|        |          pic              |
|        |          microcontroller  |
|        |          discussion list  |
|        |                           |
|--------+--------------------------->
 >----------------------------------------------------------------------------|
 |                                                                            |
 |       To:     spam_OUTPICLISTTakeThisOuTspamMITVMA.MIT.EDU                                       |
 |       cc:     (bcc: Scott Touchton/US/UNIPHASE)                            |
 |       Subject:     Re: [EE]: How to jamm a cell phone?                     |
 >----------------------------------------------------------------------------|





> Give it a try, stop people from using cell phones in your
> house or shop.

Yeah, go for it.  See what happens to you as a result.  The licences get
sold at very high prices to people who can afford them.  These same
organisations tend to be less than happy at people interfering with their
right (real or imagined) to use the frequency band they have purchased the
rights to.

> Why should someone else be allowed to tell you what RF you
> are allowed to
> use on your property.  Just don't take it further than that.

???
RF doesn't exactly stop at an arbitrary boundary.  Being radiation, it sort
of... well.. radiates.  Outwards.

I can pick up our on-site picocells on my mobile outside the boundaries of
the site.  Bear in mind - this stuff is developed, tested and analysed
minutely - not some jury-rigged lashup.  (Honest!)

> As long as you
> are not effecting people who are not on your site then what's
> the problem?
> One good reason for doing this may be to stop workers from
> sending text
> messages and chatting on their mobiles when they should be working.

Possibly.  However, the majority of people around me using their mobiles are
doing so for work. YMMV.

If you *really* want to jam cellphones, you want a basestation with
sufficient power to swamp the other stations in the vicinity.  Bear in mind,
they tend to be large, not terribly mobile and require sizeable antenna
(which over here, require planning permission).  You'd only need one radio
(GSM - TDMA), as you'd only need to knacker the BCH.

I'm sure I could put you in touch with someone who could sell you one... <G>

Peter

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads




part 2 4010 bytes content-type:application/octet-stream; (decode)

part 3 154 bytes
--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


2001\03\23@102256 by David VanHorn

flavicon
face
At 08:55 AM 3/23/01 -0500, you wrote:
>This brings to mind a military system I heard about, but could never find any
>info on.  Supposedly, someone has developed a communication system based on
>wavelength that prevents reception after a certain distance.  I can't picture
>the physics of this in my brain.
>
>Has anyone out there any knowledge of this?

There's sat-sat com links at 60 GHz, because the atmosphere is basically
"black" at that freq.

--
Dave's Engineering Page: http://www.dvanhorn.org
Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


2001\03\23@102517 by Bond Peter S-petbond1

flavicon
face
> There's sat-sat com links at 60 GHz, because the atmosphere
> is basically
> "black" at that freq.

Why?  Resonant frequencies?

Peter

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


2001\03\23@104824 by David VanHorn

flavicon
face
At 03:25 PM 3/23/01 +0000, Bond Peter S-petbond1 wrote:
> > There's sat-sat com links at 60 GHz, because the atmosphere
> > is basically
> > "black" at that freq.
>
>Why?  Resonant frequencies?

Absorption by oxygen in the atmosphere.
--
Dave's Engineering Page: http://www.dvanhorn.org
Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


2001\03\23@105632 by t F. Touchton

flavicon
face
part 1 1963 bytes content-type:text/plain; charset=us-asciiThe concept I am making reference too implied that this type of communication
took place at ground level (not outside the atmosphere).  Not sure if it was
just someone's pipe dream or not.  The usual buzzwords were in the conversation
(Lawrence Livermoore Labs, and Sarnoff) so it could easily just be a spoof.

But on the flip side, everything is doable just a matter of finding out how.


|--------+----------------------->
|        |          David VanHorn|
|        |          <dvanhorn@CED|
|        |          AR.NET>      |
|        |                       |
|        |          03/23/01     |
|        |          10:47 AM     |
|        |          Please       |
|        |          respond to   |
|        |          pic          |
|        |          microcontroll|
|        |          er discussion|
|        |          list         |
|        |                       |
|--------+----------------------->
 >----------------------------------------------------------------------------|
 |                                                                            |
 |       To:     .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU                                       |
 |       cc:     (bcc: Scott Touchton/US/UNIPHASE)                            |
 |       Subject:     Re: [EE]: How to jamm a cell phone, and going offtopic  |
 >----------------------------------------------------------------------------|





At 03:25 PM 3/23/01 +0000, Bond Peter S-petbond1 wrote:
> > There's sat-sat com links at 60 GHz, because the atmosphere
> > is basically
> > "black" at that freq.
>
>Why?  Resonant frequencies?

Absorption by oxygen in the atmosphere.
--
Dave's Engineering Page: http://www.dvanhorn.org
Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads




part 2 2547 bytes content-type:application/octet-stream; (decode)

part 3 154 bytes
--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


2001\03\23@160342 by Rex's mail

flavicon
face
I believe the Isrealies have developed a system that was being sold in
Australia and apparently works quite well on GSM - although our equiv to the
FCC didn't like its use and has declared it illegal

wish they would also declare the cellphones as illegal

Rex

{Original Message removed}

2001\03\24@060441 by Peter L. Peres

picon face
>I believe the Isrealies have developed a system that was being sold in
>Australia and apparently works quite well on GSM - although our equiv to
>the FCC didn't like its use and has declared it illegal

How about a robot water pistol that squirts water onto anyone using a
phone in its range ? This could be a PIC project. (Replacing the water
pistol with a 0.22 is strictly out of the question).

Peter

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


More... (looser matching)
- Last day of these posts
- In 2001 , 2002 only
- Today
- New search...