Portable Home
Portable Home
What is the best home/portable water filtration system and why? ?
purr
Portable Home
Question about electrical engineering and portable home phones?
Is it possible for a device to learn a specific portable phone’s frequency (ie distinguish a specific phone unit) and engage a function when in range of that specific phone?
How unique are the frequencies of portable phones? Could a device recognize two identical portable phone systems’ frequencies of the same model as different?
Thanks for the reply. To expand upon it…
Could a device be placed within close range of the base of a portable phone and “lock in” on it? When removed from the “locked in” phone base could a device be engaged? Of course this means without interferance of other phones.
Are base units continuously transmitting?
The answer is likely ‘no’. Most cordless phones operate at eitehr 900 Mhz or 2.1Ghz. (There’s some much higher now though). The frequency they communicate over is identical. Even if the phones can talk on different channels (slightly different frequencies) they likely do this dynamically – so a phone may be on channel 1 for 10 seconds, then switch to 2.
Now – it could be a ‘yes’ if the phone had an encryption scheme. The phone’s encryption -may- be hard-coded into it somehow, but taking this data out and processing it could be very hard indeed. Even if you could, there’s no guarantee that the encryption is truly unique.
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