+
Related Flashcards
Cards In This Set
| Front | Back |
|
What reason for modulation involves modulating low frequency signals for transmission over long distances?
|
Ease of Radiation
|
|
What are the three general catergories used to produce modulation in radion frequency (RF) transmission today?
|
Amplitdue, frequency, and phase
|
|
When the modulating signal and carrier signal are combined within a modulator, the output signal contains a/ an
|
Carrier, upper sideband, and lower sideband
|
|
If a carrier frequency of 1 MHz and a modulating tone of 10 kHz goes to the modulator the output signal include
|
1.01 MHz, 1 MHz, and 0.99 MHz
|
|
If the modulating audio signal is 10 kHz wide, what is the bandwidth of the transmitted amplitude modulated signal?
|
20 kHz
|
|
The bandwidth of an amplitude modulated signal is
|
Two times the modulating signal.
|
|
The amount of effect or change that the intelligence has on the carrier in an amplitude modulated signal is expressed as the
|
Percent of modulation.
|
|
Which statement concerning bandwidth is true?
|
Overmodulating increases bandwidth due to the production of harmonics
|
|
Reducing modulation to less than 100 percent gives
|
No reduction in carrier power
|
|
In frequency modulation (FM), the amount of oscillator frequency change is
|
Directly proportional to the amplitude of the modulating signal
|
|
In frequency modulation (FM), what is considered a significant sideband?
|
Sidebands containing at least 1 percent of the total transmitted power.
|
|
What is the formula to find the modulating index?
|
Deviation divided by frequency of the modulation.
|
|
In phase modulation (PM), the carrier's
|
Phase is shifted at the rate of the modulating signal.
|
|
What is the advantage of adding more phase shifts?
|
Higher data rates with in a given bandwidth.
|
|
What is the first step in the pulse code modulation (PCM) process?
|
The analog signal is band-limited.
|
