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When your phone number is dialed by someone; either by pulses (rotary dial), touch tones (pushbutton dial), or digital coding (cell phone); the number is captured and decoded by equipment at a central office. The decoded number is sent to call switching equipment at the appropriate central offices (and if its a long distance call to call switching equipment at the appropriate long distance call management offices) needed to connect the call through. Once connected the central office sends a 120VAC 5Hz ring signal to your phone (or if your phone is a cell phone a digital ring command), causing your phone to ring. (Note: the ring the caller hears has nothing to do with this, it is a simulated ring generated by the central office at his end.) If your phone is picked up, the ring signal is removed, the call circuit is completed at both ends, and billing (if appropriate) begins.
What are appropriate means for leaving evidence of presence
To the naked eye - usually not much. To an oscilloscope (and some gadgets) it'll look like a series of pulses. To the appropriate equipment, those pulses can be anything. TV, music, a voice conversation, financial transactions.
An operational amplifier can sum an arbitrary number of signals and produce a single output signal.
You can us a satellite or even a wire coat hanger.
signal lights
modem
modem
A prepay phone can connect to a wifi signal as long as it has a wifi receiver and there is an available wifi network within close proximity to the phone.
When your phone number is dialed by someone; either by pulses (rotary dial), touch tones (pushbutton dial), or digital coding (cell phone); the number is captured and decoded by equipment at a central office. The decoded number is sent to call switching equipment at the appropriate central offices (and if its a long distance call to call switching equipment at the appropriate long distance call management offices) needed to connect the call through. Once connected the central office sends a 120VAC 5Hz ring signal to your phone (or if your phone is a cell phone a digital ring command), causing your phone to ring. (Note: the ring the caller hears has nothing to do with this, it is a simulated ring generated by the central office at his end.) If your phone is picked up, the ring signal is removed, the call circuit is completed at both ends, and billing (if appropriate) begins.
it has a built in antena
Signal interference, blocked signal, antenna problems or electrical faults.
UNITY GAIN means there is no "gain" and no "loss" of the signal strength or integrity. It means your device has made use of the signal to enable it to function, but has not degraded the signal in any way. This means the signal coming out is as good as the signal going in and can be passed on to another piece of equipment to make it function. Note that the equipment up line has to be switched on or in standby mode to enable this function in equipment connected downstream from it.
Yes. All you need is the appropriate equipment to make it possible. Do some research on the 'net and find out what pieces you'll need. Then research some more to get the best prices.
You don't need anything extra - just connect them in this order... Freeview box - DVD recorder - TV. The signal will be recorded by the DVD recorder before it gets to the TV
Errors which have occurred in a digital signal are a result of a faulty transmission or a disruption in the signal itself. This can occur from a damaged wire or the equipment which generates the signal.
Errors which have occurred in a digital signal are a result of a faulty transmission or a disruption in the signal itself. This can occur from a damaged wire or the equipment which generates the signal.