In article , "Michael Kennedy" wrote:
Well this answer is similar to your question..

I have a friend who lives close to an AM band radio station. If he turns his
computer speakres on they will faintly pick up the radio station near by. It
is kind of coo.. I would immagine if cell phones were still analog you could
probably hear a conversation the same way.

- Mike


I don't know how many current phones still do, but both my phones
have both analog and digital capability. FM not AM analog.

The basic problem with AM is AM. Amplitude modulation. Aircraft
radio's use some AM, but most communication services
are FM or now digital. Analog cell phones are some type of FM.

Strong FM and television stations can easily demod into
active devices, but not always audible.

If you use one of those Led phone blinkers that work from
radiation, you will see the same thing occuring before a ring
or when the phone is communication with a tower.

greg




"Mike Muderick" wrote in message
news:C2mSf.50610$Px4.19175@trnddc04...
If I leave my cell phone near my computer speakers I will hear occasional
buzzing, clicking, etc. Before the phone begins to ring, I hear a
dah..dah.daahhhhh. I know this is RF interference being picked up by the
amplifier in the speaker. If one were to record this sound with a
microphone at 11 or 22Khz, would it be possible to obtain any information
(usable signal) from the recorded audio?
Thanks,