Does our Bluetooth technology come from an external antenna?
08-06-2011, 01:00 AM
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Does our Bluetooth technology come from an external antenna?
Does the bluetooth in the C300s (w/ Audio 20 but doubt that makes a difference) come from a internal or external antenna? I have been reading a lot about cell phone radiation, its avoidance, and so on and was curious to know.
08-06-2011, 09:37 AM
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The bluetooth frequency is the 2.4 GHZ range, and is the same as WiFi in frequency range. HOWEVER, bluetooth signal strength is an absolute fraction of cell phone strength, as it can only transmit about 25 feet or so. Nothing to worry about. It is the phone itself (that ALWAYS) uses its internal antenna to transmit to the tower that may be cause for concern.
08-06-2011, 10:13 AM
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The bluetooth frequency is the 2.4 GHZ range, and is the same as WiFi in frequency range. HOWEVER, bluetooth signal strength is an absolute fraction of cell phone strength, as it can only transmit about 25 feet or so. Nothing to worry about. It is the phone itself (that ALWAYS) uses its internal antenna to transmit to the tower that may be cause for concern.
If the BT transmission was from the external antenna, the phone would need to transmit at higher power to reach the antenna (for the BT connection) and the radiation level would be higher. In any case as mentioned above, the BT signal levels are so small that there is nothing to worry about that. Keeping the cell phone in a cradle (if BT SAP is not available) makes a big difference (not because of BT).
08-06-2011, 11:56 AM
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I know that Bluetooth has much less radiation than the RF signals from phones, but apparently if you use your phone inside the car the radiation is magnified because the signals are bouncing around inside the metal cage of the car, and it is thus better to have a external Bluetooth antenna.
All that according to this: http://www.emfnews.org/Car-Radiation...nd-Cancer.html
Is the website totally off?
All that according to this: http://www.emfnews.org/Car-Radiation...nd-Cancer.html
Is the website totally off?
08-06-2011, 11:57 AM
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Exactly, this is why we have the BT SAP option in Europe.
If the BT transmission was from the external antenna, the phone would need to transmit at higher power to reach the antenna (for the BT connection) and the radiation level would be higher. In any case as mentioned above, the BT signal levels are so small that there is nothing to worry about that. Keeping the cell phone in a cradle (if BT SAP is not available) makes a big difference (not because of BT).
If the BT transmission was from the external antenna, the phone would need to transmit at higher power to reach the antenna (for the BT connection) and the radiation level would be higher. In any case as mentioned above, the BT signal levels are so small that there is nothing to worry about that. Keeping the cell phone in a cradle (if BT SAP is not available) makes a big difference (not because of BT).
08-07-2011, 02:29 AM
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When I said "that's why we have BT SAP in Europe" was supposed to mean BT SAP is not available in the US (for MB) which is probably why you have not heard about it.
Anyway, BT SAP is a bluetooth profile that allows the SIM card from a cell phone to be used remotely by the phone kit in the car. Obviously this is only feasible for GSM/UMTS phones that have a SIM card (probably one reason why BT SAP was not released to the US as it would not work with CDMA phones). The phone kit in the car actually consists of a complete dual band (European frequencies, stupid from Peiker to make it as a dual band device) GSM phone. The BT SAP device in the car can either take a physical SIM card or use your phone SIM card via the BT connection. This means you can keep your phone in your pocket but you would still be using the car antenna for cellular connectivity.
European MB web sites give more details for those who are interested.
Anyway, BT SAP is a bluetooth profile that allows the SIM card from a cell phone to be used remotely by the phone kit in the car. Obviously this is only feasible for GSM/UMTS phones that have a SIM card (probably one reason why BT SAP was not released to the US as it would not work with CDMA phones). The phone kit in the car actually consists of a complete dual band (European frequencies, stupid from Peiker to make it as a dual band device) GSM phone. The BT SAP device in the car can either take a physical SIM card or use your phone SIM card via the BT connection. This means you can keep your phone in your pocket but you would still be using the car antenna for cellular connectivity.
European MB web sites give more details for those who are interested.
