Transmitting a signal even when its not placing a call?
Requirement to turn off a -lawfully- allowed RF device?
Hopefully not yes to both.
Oh, yes, the receiver's Local Oscillator "transmits" a
picayune picoWatt or so...
And much more than the picayunish oscillator leakage you allude to (if
the receiver is even so crude as to have an actual Local
Oscillator)......
Instead of the "DX" oscillator?
I've heard of cell site conmfirmation from 27 nm.
Thank goodness cell phones don't require a knowledge of Morse Code.
It would have been a monumental flop.
As soon as a cell phone is powered up it immediately establishes radio
communications with the MTSO over the control channel, comparing
SID's, negotiating a registration request, and other similar
housekeeping chores.
Just relax and call it handshaking.
This radio communications occurs even if you
never actually place an outgoing call or recieve an incoming call.
Doesn't even rate a "duh!"
That's why you find guys at the other end of the tunnel standing by
with computer controlled "law enforcement" scanners logging all the
codes as you pop out the other side and handshake with the local cell
site.
Then they sell them to Taliban operatives and drug dealers.
Sunuvagun!
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