harmonics - causes distortion
Marconi - wireless telegraph
lambda/4 am broadcast antenna - 24 radials or more
industrial noise frequency - 15 - 160 MHz
For 100% percent modulation in AM, the modulation envelope has a peak value double the unmodulated carrier level.
The color phasor has what phase for the I signal? - 57deg
(Nov 1996)Multiplexing in a time division multiplexer occurs based upon - the positioning of data within a frame
The signal which is superimposed on a high-frequency sine wave is called - information
A duplexer is used to - Connect a receiver and a transmitter to the same antenna
(Nov 1998) What connects the front-end circuit of a VHF TV super heterodyne receiver? - Local oscillator, mixer and RF amplifier
pitch - determined by the frequency
AFC - holds the horizontal oscillator on frequency
fundamental frequency - lowest frequency produced by musical instruments
stability - major requirement of oscillators used in SSB receiver
Mel - unit of pitch
This noise increases with bias current level and is inversely proportional to the square of frequency. - burst noise
COMPARE - shot, flicker, thermal
ISB - commonly used in Telephone and Telegraph comm
above 20kHz - referred to as Radio freq
Baffle - A relatively rigid extended surface surrounding an acoustic source.
To what feature of the modulating tone is FM deviation proportional? - amplitude
What is gained by operating an oscillator on some subharmonic of the transmission frequency? - frequency stability
(Mar 1996) What is the primary advantage of DSBSC in AM? - No transmitter power is wasted in the carrier
Most household radio receiver uses ___ detector. - envelope
Q and I amplitudes - determine the purity of received colors
The audio is reconstructed from the radio wave by - the action of the filter capacitor connected across headset
(Apr 1998) An instrument for recording waveforms of audio frequency. - phonoscope
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