AM
What are some advantages of AM
Cheap, Easy to design/build/maintain, used for long range
what determines amount of deviation
amplitude of intelligence
What are the 4 types of Loss
Resistive, Capacitive, Radiation, Induction
In an AM transmitter the Oscillator produces ____
basic carrier frequency
what is designed for military avionics applications
MIL STD 1553
what is heterodying
mixing of 2 frequencies across a non linear device
Special type of diode used with reverse bias
Varactor Modulator
Types of Transmission lines
Twisted pair, Twin lead, Open two-wire, Flexible coaxial, Rigid Coaxial
In an AM receiver, what demodulates the IF
Detector
What is handshaking
when one device is faster than the other is slows down for the other.
What is the ideal percentage range for modulation
95-100%
Disadvantage of FM
high cost, line of sight transmission, wide bandwidth
What determines impedance characteristics
Inductance, Capacitance
In an FM transmitter the Limiter...
removes amplitude variations to keep output power constant and removes any noise
What are the two cable configurations
DTE, DCE
in commerical AM ___ is 455kHz
IF
the higher the audio frequency, the more ___ ____
deviation rate
How does Physical and Electrical length differ
physical= measured in linear units, electrical= measured in wavelengths
In a FM receiver ____ is used to recreate intelligence
discriminator
What are the other names for a GPIB
HPIB, IEEE-488
___ is the process of recovering intelligence from a transmitted modulated form
Demodulation
_____ operates like a voltage controlled variable capacitor in an oscillator FDD
Varactor Modulator
What converts RF current and voltage into electromagnetic waves
Transmitter Antenna
If the RF amplifier in a AM receiver produces 1005kHz, what is the output of the tuned filter
450kHz
What are the data transfer bits in a GPIB
DI01, DI08