Locating a cellphone jammer...

[Alan Holt]

Basically, you need a receiver tuned to the general frequency and a
directional antenna.

Search for "amateur radio foxhunt" or "rf sniffer". Amateur radio operators
do this for fun; it is called a "foxhunt", where a transmitter is hidden and
participants try to find it in the shortest time.

 

[Fred Bloggs]

Alan Holt wrote:

Basically, you need a receiver tuned to the general frequency and a
directional antenna.

Search for "amateur radio foxhunt" or "rf sniffer". Amateur radio operators
do this for fun; it is called a "foxhunt", where a transmitter is hidden and
participants try to find it in the shortest time.

Ooooh- my my my- what fun!

 

[Michael A. Terrell]

Fred Bloggs wrote:

Alan Holt wrote:
Basically, you need a receiver tuned to the general frequency and a
directional antenna.

Search for "amateur radio foxhunt" or "rf sniffer". Amateur radio operators
do this for fun; it is called a "foxhunt", where a transmitter is hidden and
participants try to find it in the shortest time.



Ooooh- my my my- what fun!

It is to the guys involved. It is also used to teach people to build
the receivers and directional antennas. The prizes given to the winner
helps, too. ;-) Go to a large hamfest sometime, and you'll see guys
wandering around looking for the hidden transmitter, with hundreds of
other radios on the same band in use while they search. A lot of time
and effort go into the design and building of the radios and the
antennas.

--
We now return you to our normally scheduled programming.

Take a look at this little cutie! ;-)
http://home.earthlink.net/~mike.terrell/photos.html

Michael A. Terrell
Central Florida

 

[Zak]

Alan Holt wrote:

Basically, you need a receiver tuned to the general frequency and a
directional antenna.

A "good" cellphone jammer will only transmit when a phone is
transmitting. And a phone will not transmit very long if the jammer is on...


Thomas

 

[Fred Bloggs]

Michael A. Terrell wrote:

Fred Bloggs wrote:

Alan Holt wrote:

Basically, you need a receiver tuned to the general frequency and a
directional antenna.

Search for "amateur radio foxhunt" or "rf sniffer". Amateur radio operators
do this for fun; it is called a "foxhunt", where a transmitter is hidden and
participants try to find it in the shortest time.



Ooooh- my my my- what fun!


It is to the guys involved. It is also used to teach people to build
the receivers and directional antennas. The prizes given to the winner
helps, too. ;-)

What are the prizes like?

Go to a large hamfest sometime, and you'll see guys
wandering around looking for the hidden transmitter, with hundreds of
other radios on the same band in use while they search. A lot of time
and effort go into the design and building of the radios and the
antennas.

How about staking down two receivers, with GPS, dual beam nulling on
each- report AOA to central processor for xmit location calculation-
fire mortar at xmit and destroy it.

 

[Michael A. Terrell]

Fred Bloggs wrote:

Michael A. Terrell wrote:
Fred Bloggs wrote:

Alan Holt wrote:

Basically, you need a receiver tuned to the general frequency and a
directional antenna.

Search for "amateur radio foxhunt" or "rf sniffer". Amateur radio operators
do this for fun; it is called a "foxhunt", where a transmitter is hidden and
participants try to find it in the shortest time.



Ooooh- my my my- what fun!


It is to the guys involved. It is also used to teach people to build
the receivers and directional antennas. The prizes given to the winner
helps, too. ;-)

What are the prizes like?

I have seen a new ham rig as the first place prize, at least $250
value.

Go to a large hamfest sometime, and you'll see guys
wandering around looking for the hidden transmitter, with hundreds of
other radios on the same band in use while they search. A lot of time
and effort go into the design and building of the radios and the
antennas.


How about staking down two receivers, with GPS, dual beam nulling on
each- report AOA to central processor for xmit location calculation-
fire mortar at xmit and destroy it.

Why destroy it? It is intended to test your skills in locating the
source of a weak signal, and to see how fast you can do it. They run
several rounds, and the shortest time to locate it, wins. This hobby has
been around since the days of miniature tubes, and "B" battery packs, or
maybe even longer.


--
We now return you to our normally scheduled programming.

Take a look at this little cutie! ;-)
http://home.earthlink.net/~mike.terrell/photos.html

Michael A. Terrell
Central Florida

 

[Dave Holford]

Zak wrote:

Alan Holt wrote:

Basically, you need a receiver tuned to the general frequency and a
directional antenna.

A "good" cellphone jammer will only transmit when a phone is
transmitting. And a phone will not transmit very long if the jammer is on...

Thomas

Now we are starting to get complex. Wide band receivers which can
identify cell-phones from other legitimate users on adjacent
frequencies, determine which frequency the cell-phone is currently on
and transmit a signal which will overpower the cell-phone transmitter.
And, if it is going to work, be able to monitor the cell-phone while
jamming so that it knows when to stop the jamming signal.

We are starting to get into the realm of military ECM.

Why not jam the phone's reception of the control channels? So much
simpler, easier, lower power requirement etc. etc.

Dave