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What is the frequency and wave form of old land line phone carrier?
Chrismicro
First answer.
The landline phone has no carrier frequency it is a baseband signal with a 3KHz bandwidth.
Correction:
So there is a signal that can handle a 3KHz bandwidth, what do you call that signal? I call it a carrier, if you don't have a carrier, you will need to amplify the audio every 30 meters else you will end up with no audio at the end of the line. So there is a carrier on all phone lines. Note the carrier signal are up to 90 VPP and is AM modulated at the instrument, but in digital systems the carrier are switched on and of, FSK modulation.
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∙ 11y ago
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