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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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cellphone qu estion
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, |
#2
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cellphone qu estion
"Mike Muderick" wrote in message news:C2mSf.50610$Px4.19175@trnddc04... If I leave my cell phone near my computer speakers I will hear occasional buzzing, clicking, etc. Before the phone begins to ring, I hear a dah..dah.daahhhhh. I know this is RF interference being picked up by the amplifier in the speaker. If one were to record this sound with a microphone at 11 or 22Khz, would it be possible to obtain any information (usable signal) from the recorded audio? Thanks, The phone is periodically querying its environment as it programmed to do. No, on a practical basis, the audio that you could record is not useful. |
#3
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cellphone qu estion
Well this answer is similar to your question..
I have a friend who lives close to an AM band radio station. If he turns his computer speakres on they will faintly pick up the radio station near by. It is kind of coo.. I would immagine if cell phones were still analog you could probably hear a conversation the same way. - Mike "Mike Muderick" wrote in message news:C2mSf.50610$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, |
#4
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cellphone qu estion
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, |
#6
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cellphone qu estion
Typical example of "topic drift":
"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?" The basic answer is still "NO." |
#7
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cellphone qu estion
It is either a GSM (Cingular, Tmobile Suncom etc.) the amplifier if
detecting the rf signal which is a pulsed signal. It is the phone "checking in" with the base station, There is no "usable" information being transmited (other then to the phone" Frank Mike Muderick wrote: 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, |
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