Band of light waves, that are too short to be seen by human eye

Two wires that are bent 90 degrees apart.

The first symbol in the designation of radio emission under the ITU rules to

Operating method in which the transmission is made alternately in each direction of a telecommunication channel

Production of radiation by a radio transmitting station

The third symbol in the designation of radio emission under the ITU rules refers to

A form of telecommunication for the transmission of transient images of fixed or moving objects.

Radiation pattern of a discone.

Another SEG function that allows a person to be superimposed on another scene.

What signal-to-noise ratio is required for satisfactory telephone services?

The use of telecommunication for automatic indicating or recording measurement at the distance from the measuring instrument.

The standard deviation of the variation in the transmission loss of a circuit should not exceed

Noise caused by the thermal agitation of electrons in resistance.

Unity gain antenna

The series of periodically recurrent pulses is modulated in amplitude by the corresponding instantaneous samples.

This type of transmission permits communication in the frequency range from 30 to 60 MHz and over distances from about 1000 to 2000 km.

A region in front of a paraboloid antenna.

Designates the sensation of low or high in the sense of the base and treble.

A good example of a pilot tone system used in commercial frequency modulation stations

Emission on a frequency or frequencies immediately outside the necessary bandwidth which result from the modulation process except spurious emission.

A helical antenna is used for satellite tracking because of ______.

Background noise is the same as the following except

Electronic equipment used to measure standing wave ration.

A single sideband emission in which the degree of carrier suppression enables the carrier to be reconstituted and to be used for demodulation.

Standard single sideband emission

The electric field lines in a plane perpendicular to the earth’s surface.

Known to be the first satellite capable to receive and transmit simultaneously.

A digital carrier facility used to transmit a DSI-formatted signal at 1.544. Mbps.

12 voice channels are sampled at 8000 sampling rate and encoded into 8 bit PCM word. Determine the rate of the data stream.

The most common device used as a light detector in fiber optic communications system.

Two resistors, 20 kΩ, and 50 kΩ are at ambient temperature. Calculate for a bandwidth equal to 100 kHz, the thermal noise voltage for the two resistors connected in parallel.

Calculate the energy of the photon of infrared light energy at 1.55µm

If a fiber optic system has a rise time of 38.55 ns, the source rise time is 12 ns and the detector rise time is 12 ns, what is the cable rise time?

Nominal voice channel

Two or more antennas separated by 9 wavelengths are used.

Nif stands for

Any small element of space in the path of a wave may be considered as a source of secondary wavelet.

Modulation in which the modulated wave is always present.

Atmospheric noise is less at severe frequencies above

At height about 180 km above the earth exist only during daylight.

Radiation characteristics of a dipole

Determine the gain of a 6 ft. parabolic dish operating at 1800 MHz.

An electromagnetic wave is ________ polarized when the electric field lies wholly in one plane containing the direction of propagation.

A device that reduces the intensity of light in fiber optics communication systems.

Propagation mode of microwave in a waveguide is known as _______.

The width of the frequency band which is just sufficient to ensure the transmission of information at the rate and with the quality required under a specified condition and class of emission.

A convenient method of determining antenna impedance.

Which of the following fall under the high frequency band of the radio spectrum?

The electric field lies in a plane parallel to the earth’s surface.