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Yes, only the amplitude is changed.walters said:Amplitude Modulation of the carrier.
The amplitude modulation only changes the carrier's amplitude not the frequency or timbre?
No. An AM radio has demodulated audio at its volume control. The amount of audio that feeds the modulator at the radio station changes the amount of amplitude modulation.The radio volume control changes the amplitude modulation?
Radio stations operate on a fixed RF frequency.The radio station tuner changes the carrier frequency?
AM stereo? AM sounds terrible. Most of the high frequencies of audio are missing and the distortion and interference are very high.walters said:AM radios, the left plus right information must be transmitted by conventional amplitude modulation. It's how the left minus right stereo information is handled that differs between the various systems.
It isn't a chip. It is a diode.What is envelope dectector chips?
Left channel on one sideband and right channel on the other sideband? Both in the narrow bandwidth of an AM broadcast station? It would sound even worse than a mono AM radio.left minus right phase modulation by adding the proper phase shifts to the audio it is possible to generate an independent sideband signal with right on the upper sideband and left on the lower.
Yes. AM radio stations played with stereo many years ago. There were a few incompatible competing systems. Do any AM stations broadcast stereo today?audio matrix?
This system transmits stereo by using 2 phases of the RF carrier 90 degrees apart. Each phase of the carrier is fed to a balanced modulator. The balanced modulator that is in phase with the original RF signal receives left plus right mono audio. The balanced modulator that is 90 degrees out of phase receives the left minus right stereo information. The balanced modulator outputs are summed together with the original in phase carrier and then passed through a limiter so only the phase information is retained.
quadrature AM signal?
I don't think there is such thing as an AM modulator chip. If there was, then young kids with some electronic knowledge could make transmitters and potentially screw up the entire neighbourhood :lol:walters said:I think the mixer/oscillator in a Radio is actaully a AM modulator chip...
Not really.a mixer=modulator i guess
Two diodes back-to-back are common. Better known as a transistor modulator.Modulators:
- Diode used as modulator (there are many variations of this)
Many modulators are voltage controlled oscillators.- voltage controlled amplifier circuit (use video signal as the control voltage)
I think the only use for an attenuator is to make the signal more clear. Other than that, it will hinder the range of the receiver, or hinder the transmitters range.- voltage or current controlled attenuator (transistor, fet or diode based)
You could make a simple mixer. Take two resistors and connect one end of each one together. The tied (connected) ends make an output, and the untied ends make the inputs to each signal.- special mixer IC circuit (analogue multiplier)
You will be lucky if you find any, and if you do, you will find a datasheet on an IC that helps form the modulator. If you want a schematic, search google for "transistor transmitter".Does the data sheets for AM modulators show a schematic of whats inside a AM modulator?
AM = amplitude modulation. Amplitude = volume. so basically, the volume (amplitude) changes when the input to the modulator changes.how does it produce the AM modulation waveform?
Can I have your eyes? :shock: :lol:I see the carrier frequency...
I explained it above.i don't understand about the AM modulation waveform how it creates thats sort of modulation
VCO = Voltage controlled oscillator....VCO makes this type of modulation...
how does this modulator chip create that "Bubble shape" around the carrier frequency?