short range, directional mobile phone jammer?

Anyone know where I could find a short range (10 feet max), short
burst (just long enough to disconnect a call), directional mobile
phone jammer? Just to disconnect loudmouths on the train, directional
so it doesn't affect someone quietly texting in different direction?

thanks

---

› See More: short range, directional mobile phone jammer?

paranoid bob schrieb:
> Anyone know where I could find a short range (10 feet max), short
> burst (just long enough to disconnect a call), directional mobile
> phone jammer? Just to disconnect loudmouths on the train, directional
> so it doesn't affect someone quietly texting in different direction?

Aside from the fact that you are not going to find such a device, I
would consider this a very dangerous strategy.

Chances are he is going to call again and you are going to hear a 30
minute discussion, beginning with "you won't believe what just happened...".

If you zap his phone again, he will most likely accept that he cannot
make a phone call....and start playing MP3 through the phone speaker.
You do not want that.

Andreas

paranoid bob wrote:
> Anyone know where I could find a short range (10 feet max), short
> burst (just long enough to disconnect a call), directional mobile
> phone jammer? Just to disconnect loudmouths on the train, directional
> so it doesn't affect someone quietly texting in different direction?

Unavailable and illegal (in the US).

--
Notan

"Andreas Wenzel" <[email protected]> wrote in message
news:[email protected]...
>
> If you zap his phone again, he will most likely accept that he cannot make
> a phone call....

Nope, he will continue ad finitum to press redial because the years of
exposure to harmful radiation from the phone permanently clamped to his ear
will have caused his numbed brained not to register that no call is going to
be successful.

It won't stop "hello.....................hello??" though.

"paranoid bob" <[email protected]> wrote in message
news:[email protected]...
> Anyone know where I could find a short range (10 feet max), short
> burst (just long enough to disconnect a call), directional mobile
> phone jammer? Just to disconnect loudmouths on the train, directional
> so it doesn't affect someone quietly texting in different direction?
>
> thanks
>
Have a search via Google, they are available if you have the money, all they
do is block the reception on the phone and cause the call to drop. The
phone will scan and show "no signal".

I also hate people who feel the need to shout down their phones. The most
annoying people are the ones that repeat everything the other person says so
you get both sides of the conversation.

"R. Mark Clayton" <[email protected]> wrote in message
news:[email protected]...
>
> "paranoid bob" <[email protected]> wrote in message
> news:[email protected]...
>> Anyone know where I could find a short range (10 feet max), short
>> burst (just long enough to disconnect a call), directional mobile
>> phone jammer? Just to disconnect loudmouths on the train, directional
>> so it doesn't affect someone quietly texting in different direction?
>>
>> thanks
>>
>
> Given that mobile phones still work under pantograph wires and under
> bridges etc. (but not tunnels) you will need a fairly long burst, and
> pretty high energy to defeat a frequency agile GSM. In any event you
> would only mess up the receive segment. The phone would hand off to
> another base station in another direction fairly soon too. With CDMA or
> UMTS you would have even less luck.
>
>
Phone jammers I used hopped across the two bands fairly quickly from end to
end. The output power was about 1 watt which is OK for about 50ft radius in
the open. More than enough for a bus, train or restaurant. A person will
not be able to hear anything from the base station as the 1w signal next to
them gives a higher field strength than 80 watts from 1/2mile away going
through obstructions and path loss. Even if they get logged on for a few
seconds it will be of no use as the call will drop again. They are
excellent to annoy people with, especially if trying to eat a meal in a
restaurant and constantly hearing phones going and people screaming down
them.
You can get much higher powered ones for fixed installations.

["Followup-To:" header set to alt.cellular.]
On 2007-08-06, Ron <[email protected]> wrote:

> Have a search via Google, they are available if you have the money, all they
> do is block the reception on the phone and cause the call to drop. The
> phone will scan and show "no signal".

Of course, active jamming is still illegal... whether the devices are
available or not.

Notan <notan@ddressthatcanbespammed> wrote:

> paranoid bob wrote:
> > Anyone know where I could find a short range (10 feet max), short
> > burst (just long enough to disconnect a call), directional mobile
> > phone jammer? Just to disconnect loudmouths on the train, directional
> > so it doesn't affect someone quietly texting in different direction?
>
> Unavailable and illegal (in the US).

Yes, probably illegal. But you used something with such a short range,
how could you get caught?

I've seen on the WWW the big jammers that are illegal in the UK and
USA, made in UK but for sale to elsewhere in Europe. Those are too
general for what I want.

Is it possible to make something like what I asked about, with some
electrical skills? (I know how to solder and read a circuit diagram,
but I'm not an engineer.)

"paranoid bob" <[email protected]> wrote in message
news:[email protected]
> Anyone know where I could find a short range (10 feet max), short
> burst (just long enough to disconnect a call), directional mobile
> phone jammer? Just to disconnect loudmouths on the train, directional
> so it doesn't affect someone quietly texting in different direction?

Since train signallers and some railway radio systems use GSM, would you
really want to risk intefering with the safety just because you're a
self-important twat?

Tim

--
Sent from Birmingham, UK... Check out www.nervouscyclist.org
'I find sometimes it’s easy to be myself, but sometimes I find it’s
better to be somebody else.' - Dave Matthews 'So Much To Say'
My 'reply to' address is valid, mail to the posting address is dumped

On Tue, 7 Aug 2007 08:20:16 UTC, "Tim Dunne"
<[email protected]> wrote:

> "paranoid bob" <[email protected]> wrote in message
> news:[email protected]
> > Anyone know where I could find a short range (10 feet max), short
> > burst (just long enough to disconnect a call), directional mobile
> > phone jammer? Just to disconnect loudmouths on the train, directional
> > so it doesn't affect someone quietly texting in different direction?
>
> Since train signallers and some railway radio systems use GSM, would you
> really want to risk intefering with the safety just because you're a
> self-important twat?

No, the loudmouths are the self-important twats...the rest of us just
want a quiet life.
--
Bob Eager
begin 123 a new life...take up Extreme Ironing!

"Ron" <[email protected]> wrote:

> Phone jammers I used hopped across the two bands fairly quickly from end to
> end. The output power was about 1 watt which is OK for about 50ft radius in
> the open. More than enough for a bus, train or restaurant. A person will
> not be able to hear anything from the base station as the 1w signal next to
> them gives a higher field strength than 80 watts from 1/2mile away going
> through obstructions and path loss. Even if they get logged on for a few
> seconds it will be of no use as the call will drop again. They are
> excellent to annoy people with, especially if trying to eat a meal in a
> restaurant and constantly hearing phones going and people screaming down
> them.

Sounds perfect! Have you got a url for that?

> You can get much higher powered ones for fixed installations.

I've seen those on the WWW, too powerful. As I said, I'm not against
the use of mobile phones in public places, just the annoying abuse of
them (I use mine on the train frequently, but QUIETLY).

Steve Sobol <[email protected]> wrote:

> > Have a search via Google, they are available if you have the money, all they
> > do is block the reception on the phone and cause the call to drop. The
> > phone will scan and show "no signal".
>
> Of course, active jamming is still illegal... whether the devices are
> available or not.

If you use one for short bursts on a moving train, what are the
chances of getting caught? The loudmouthed idiots just think it's a
random bad patch.

paranoid bob schrieb:

> I've seen those on the WWW, too powerful. As I said, I'm not against
> the use of mobile phones in public places, just the annoying abuse of
> them (I use mine on the train frequently, but QUIETLY).

So you are the one who gets to decide how quiet is quiet enough? How do
you know you don't annoy other passengers?

Andreas

"Ron" <[email protected]> wrote:

> > Anyone know where I could find a short range (10 feet max), short
> > burst (just long enough to disconnect a call), directional mobile
> > phone jammer? Just to disconnect loudmouths on the train, directional
> > so it doesn't affect someone quietly texting in different direction?
> >
> > thanks
> >
> Have a search via Google, they are available if you have the money, all they
> do is block the reception on the phone and cause the call to drop. The
> phone will scan and show "no signal".

Search for what on google? I can only find them with too long a range;
even this
http://www.globalgadgetuk.com/Personal.htm
is too far-reaching at 10 metres.


> I also hate people who feel the need to shout down their phones. The most
> annoying people are the ones that repeat everything the other person says so
> you get both sides of the conversation.

Yes. All train carriages should be designated "quiet".

Andreas Wenzel <[email protected]> wrote:

> > I've seen those on the WWW, too powerful. As I said, I'm not against
> > the use of mobile phones in public places, just the annoying abuse of
> > them (I use mine on the train frequently, but QUIETLY).
>
> So you are the one who gets to decide how quiet is quiet enough? How do
> you know you don't annoy other passengers?

I sit quietly. I don't smell, talk on my phone, play music or make any
other noises that anyone else can hear, or put things on the next seat
to discourage someone else from sitting there.

Anything else?