Many years ago it was done with junked Video
Tape Recorders and, from what I saw and read,
very successfully too.

If this is the same project that I remember, it's based mostly around
the TV tuner module from an old VCR.

The TV tuners work real nicely as they have a well-defined interface to
the VCO control voltage, mixer in, and mixer out. The VCO is also the
"right range" (VHF-Lo, VHF-Hi, UHF covers a lot of frequency!) at least
for 50MHz up to the top of the UHF TV band. I don't know what they did
for frequencies below 50MHz.

The TV tuner module is also nicely interface to (a handful of easily
soldered-to pins.)

Cellphones don't really have a well-defined module like the TV tuner in
them. They aren't broadband in the same way. Their synthesizers are
not broadband either.

Tim.

"Tim Shoppa" wrote in message
oups.com...

Cellphones don't really have a well-defined module like the TV tuner in
them. They aren't broadband in the same way. Their synthesizers are
not broadband either.

You obviously not seen the design to make a Nokia 3310 into a Cellphone
jammer. - Simple sweep osillator curcuit built on veroboard into the battery
compartment ? Just plug the mains addaptor into a stangard 240v 13A
GNER/VIRGIN power outlet and enjoy hours of
non-mobile-phone-interrupted-journey.


--
73deG1LVN
http://www.outpimp.com/?x=481566961

G1LVN:

Such things can be done, but that certainly sounds much less than workable!

The plans there might better function as a "Burnt Wiring Smell Generator!"
I have built a few of 'em, most likely there are still a few left waiting
to be built in my future...

John

On Sun, 21 Aug 2005 00:36:03 +0000, G1LVN (for it is he) wrote:

Nokia 3310

You obviously not seen the design to make a Nokia 3310 into a Cellphone
jammer. - Simple sweep osillator curcuit built on veroboard into the
battery compartment ? Just plug the mains addaptor into a stangard 240v
13A GNER/VIRGIN power outlet and enjoy hours of
non-mobile-phone-interrupted-journey.
=======
For US based readers of this NG : GNER= Great North East Railways . VIRGIN
= Virgin Trains (from the same stock as Virgin Atlantic)
The trains running from London - Edinburgh -Aberdeen vv apparently have
240V-AC sockets for hooking up laptops and other electrical devices.

Frank GM0CSZ / KN6WH