# Shared Flashcard Set

## Details

RF- Modulation, Oscillators, and mixers Circuits
RF- Modulation, Oscillators, and mixers Circuits
31
Physics
Professional
05/10/2009

Term
 Higher
Definition
 The carrier frequency is _______ than the intelligence frequency.
Term
 USB, LSB, Carrier Signal
Definition
 List the three parts of an AM envelope.
Term
 Constant Frequency, amplitude
Definition
 The two characteristics of an AM signal are _________ and ____________.
Term
 distortion
Definition
 ____________ occurs when the amplitude of the intelligence is higher than the carrier signal.
Term
 constant amplitude, frequency
Definition
 The two characteristics of an FM signal are __________ and ____________.
Term
 Emax - Emin / Emax + Emin x 100
Definition
 What is the percentage of modulation formula?
Term
 capacitors & inductors
Definition
 What two variables can determine the frequency of a tank circuit?
Term
 Carrier oscillator
Definition
 What is the name of the oscillator circuit found in a transmitter?
Term
 VCO aka Varactor
Definition
 What component has the characteristics of a variable capacitor?
Term
 Original RF signalLocal OscillatorSum of bothdifference of both
Definition
 What are the output of the mixer circuit?
Term
 LO Frequency.455 MHz higher then the original frequency
Definition
 What is the normal output frequency of the local oscillator in an AM receiver?
Term
 reference oscillator
Definition
 What circuit within the PLL drops the VCO frequency down in order to obtain a more stable frequency to compare?
Term
 Amplitude Modulation
Definition
 what does AM stand for?
Term
 Frequency Modulation
Definition
 What does FM stand for?
Term
 Each side band holds the exact same intelligence but is 180 degrees out of phase from each other.
Definition
 What the difference of USB and LSB?
Term
 Amplitude remains the same
Definition
 What remains the same with FM signals?
Term
 frequency deviation
Definition
 As the amplitude of the intelligence increases or decreases, it affects the ____________ ___________ of the carrier.
Term
 frequency deviation rate
Definition
 As the frequency of the intelligence changes, it affects the __________ ___________ of the carrier/
Term
 tank circuit
Definition
 When a capacitor and inductor are in parallel with each and used to generate a repetitive signal it is called what?
Term
 Flywheel effect
Definition
 When the tank circuit is given a charge and discharge it is called what?
Term
 resonance
Definition
 When both components have the equal energy storage values in a tank circuit it is called __________ .
Term
 Varactor
Definition
 In a tank circuit the capacitor can be replaced with what to allow to be adjustable frequencies.
Term
 Crystal Oscillator
Definition
 The reference oscillator circuit uses what to tune in a very precise frequency?
Term
 VCO
Definition
 _______ utilizes a feedback system to ensure it is always at the proper frequency.
Term
 PLL, Steering
Definition
 The _____ will adjust the __________ voltage to correct the frequency of the VCO.
Term
 Crystal oscillator
Definition
 Another type of oscillator that is commonly used in radios is the _____ ______.
Term
 Crystal Oscillator
Definition
 An oscillator commonly used to create a very precise frequency.
Term
 intermediate frequency
Definition
 What contains the same information as the original RF signal but at a lower frequency
Term
 error signal
Definition
 What is the input signal to the PLL on the output side of the VCO called?
Term
 0.5
Definition
 Using the % of modulation formula figure the following.Emax=60VEmin= 20V
Term
 quartz
Definition
 what type of crystal does a crystal oscillator commonly use?
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