Lesson 1 Flashcards
Which device can transmit and receive EM Waves?
Antenna
What is the range of audio signal frequency?
20 Hz to 20 kHz
What is any specific range of frequency of audio signal called?
Audio intelligence peak
What is base band signal?
0.3 kHz to 4 kHz
What is the formula for antenna height?
Lambda/10
Define modulation
The process by which high frequency signals will follow the characteristics of low frequency signals is called modulation
What are the 3 types of modulation?
Amplitude Modulation
Frequency Modulation
Phase Modulation
Which filter used at transmitter section?
Band pass filter
Which filter is used at receiving section?
Low pass filter
Frequency is very low for which signal
Modulating signal
Frequency is very high for which which signal
Modulated signal
What does AWGN stand for?
Additive White Gaussian Noise
Why is AWGN called additive?
It is added with amplitude of the signal
Expand PSD
Power Spectral Display
Expand ESD
Energy Spectral Density
Expand SNR
Signal to Noise Ratio
In a radio what is the components used in tuning or modulation?
An inductor and capacitor
Which component on a tuning radio is easily changed ?
Capacitor
What is used to change the capacitance?
VariCap- Variable Capacitor
After varying the capacitance , what are the steps till a person can hear the sound?
Signal amplified
|
Mixer to mix received frequency and high frequency
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Intermediate frequency amplifier
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Demodulator
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Audio Frequency Amplifier to retrieve the audio
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Speaker to hear
What is the information essentially known as?
Modulating signal or Baseband signal
What is modulated signal?
Modulating signal + very fast high frequency carrier
What is demodulation?
Separation of modulating signal from high frequency carrier is known as demodulation
