EST-01

A frequency of 27MHz has a wavelength of approximately

• 11 mm

• 27 mm

• 30 mm

• 81 m

 A signal occupies the spectrum space from 1.115 to 1.122 GHz. The bandwidth is

• 0.007 MHz

• 7 MHz

• 237 MHz

• 700 MHz

The values of Vmax and Vmin as read from an AM wave on an oscilloscope are 2.8 and 0.3. The percentage of modulation is

• 10.7 percent

•  41.4 percent

• 80.6 percent

• 93.3 percent

 A carrier of 880 kHz is modulated by a 3.5 kHz sine wave. The LSB and USB are, respectively,

• 873 and 887 kHz

• 876.5 and 883.5 kHz

•  883.5 and 876.5 kHz

• 887 and 873 kHz

An AM signal has a carrier power of 5 W. The percentage of modulation is 80 percent. The total sideband power is

• 0.8 W

• 1.6 W

• 2.5 W

• 4.0 W

For 100 percent modulation, what percentage of power is in each sideband?

• 25 percent

• 33.3 percent

• 50 percent

•  100 percent

An AM signal without the carrier is called a(n)

In the united states, the electromagnetic spectrum is regulated and managed by

• ITU

• United Nations

• FCC

• NTC

For a given bandwidth signal, more channel space is available for signals in the range of

• EHF

• SHF

• VHF

• UHF

Transmission of graphical information over the telephone network is accomplished by

• Videotext

• CATV

• Facsimile

• TV