Shared Flashcard Set

Details

Advanced Show Production Systems
Wireless Systems 1&2
17
Engineering
Undergraduate 4
04/17/2013

Additional Engineering Flashcards

 


 

Cards

Term
•WHAT ARE THE TWO COMPONENTS THAT MAKE UP A RADIO WAVE?
Definition
Magnetic field (“H” Field), Electric field (“E” Field): Determines polarization.
Term
•WHAT IS A CARRIER WAVE?
Definition
Base unmodulated frequency the TX and RX remain locked to.
Term
•NAME TWO TYPES OF MODULATION?
Definition
Frequency & Amplitude
Term
•WHAT TYPE OF MODULATION IS USED FOR WIRELESS MICROPHONE AND IN EAR–MONITOR SYSTEMS? WHY?
Definition
Frequency modulation because it has a wider frequency response (50-16kHz) and better dynamic range (90+ dB).
Term
•WHAT TWO TYPES OF AUDIO SIGNAL PROCESSING ARE USED IN
TRANSMITTING AND RECEIVING? WHY?
Definition
•Pre/Post emphasis EQ
•Companding
Term
•WHAT DOES TRUE DIVERSITY MEAN?
Definition
The ability to sample the radio field from 2 or more location and/or the ability to select/combine the resulting signal.
Term
•WHAT DIVERSITY DESIGN IS MOST COMMON?
Definition
Receiver switching diversity.
Term
•WHAT IS THE MINIMUM SIZE FOR A TRANSMITTING OR RECEIVING ANTENNA?
Definition
¼ the size of the wavelength you are transmitting or receiving.
Term
•WHAT IS THE BEST WAY TO MAINTAIN MAXIMUM EFFICIENCY BETWEEN A TRANSMITTING AND RECEIVING ANTENNA?
Definition
Line of sight between TX and RX.
Term
•NAME 4 TYPES OF COMMONLY USED ANTENNA DESIGNS.
Definition
•Ground Plane
•Whip
•Yagi
•Logarithmic periodic dipole array (LPDA)
•Helical
•Circularly Polarized
Term
•WHAT ARE THE TWO TYPES OF ANTENNA DISTRIBUTION AND WHEN WOULD WE USE THEM?
Definition
Passive (up to 2), Active (more than 2).
Term
•WHAT CAUSES “DROP OUT”, “NOISE UP” AND “HITS”?
Definition
•Obstructions
•Dead or dying Batteries
•Multi-path Effects
Term
•WHAT IS THE PURPOSE OF THE SQUELCH CIRCUIT?
Definition
To mute the audio output of the receiver when RF signal level falls below a set threshold.
Term
•WHICH FREQUENCY BAND HAS its TRANSMITTER POWER LIMITER TO 50mW?
Definition
VHF (Very High Frequency)
Term
•WHICH FREQUENCY BAND HAS its TRANSMITTER POWER LIMITER TO 250mW?
Definition
UHF (Ultra High Frequency) 300-3GHz.
Term
•WHICH FREQUENCY BAND IS ILLEGAL TO USE AS OF JUNE 2010?
Definition
UHF 700 to 805 MHz.
Term
•TWO CHANNELS HAVE BEEN ALLOCATED IN EVERY MAJOR CITY MARKET FOR WIRELESS USE. WHERE ARE THEY LOCATED?
Definition
UHF – TV Channel 37: the first open channel that is above and the first open channel that is below.
Supporting users have an ad free experience!