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

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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 signal
Local Oscillator
Sum of both
difference 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
.5
Definition
Using the % of modulation formula figure the following.
Emax=60V
Emin= 20V
Term
quartz
Definition
what type of crystal does a crystal oscillator commonly use?