ATI T12

What is the purpose of any electrical communications system?

Transfer info almost instantaneously from one point to another.

Which input or output device converts an electrical signal into sound energy?

Speaker/Headset

Which frequency spectrum is the highest range between ELF, VHF, SHF and UHF?

Super high frequency (SHF)

The essential elements for electrical telecommunication systems include a transmitter, ________ ________, and receiver.

Transmitting Medium

Which type of modulation is essentially an on-off keying of a transmitter to produce brief bursts of an RF carrier?

Interrupted Continuous Wave

Which RF spectrum range is essential for commercial quality speech transmission?

Super Low

Which 3 bands are within the microwave region of the frequency spectrum?

UHF, SHF, EHF

Which type of space wave introduces problems like fading/distortion?

Ground-Reflected

The angle of reflection is _______ to the angle of incidence.

Equal

What is the purpose of RF communications?

To provide telecommunication services by processing it correctly.

Which input or output device intercepts and/or radiates electromagnetic waves?

Antenna

HF is used for

long-distance communications

What is the bending of an electromagnetic wave when it passes from one medium to another of a different density?

Refraction

T/F propagation is better over dry terrain than over water.

F

What is the difference between a transmission's highest and lowest possible frequency component?

Bandwidth

EHF is used for

Experimental purposes

Distance of communication depends on the power of the transmitter and the what?

Height of the Antenna

Which type of space wave is limited to LOS transmission distances?

Direct wave

AM broadcasts are predominately used for ___________ communications.

voice

What is the exact submultiple of a fundamental frequency?

Sub-harmonic

SLF is also known as ______ frequency

voice

Which is the second harmonic for a fundamental frequency of 2,500kHz?

5000 kHz

To modulate a signal, the three parameters of them you must vary are

Amplitude, Frequency and Phase.

What prevents external voltages from affecting the signal being passed between audio circuits; reduces undesirable noise?

Shielded cable

Once a defective stage has been ___________, it is necessary to determine which circuit within the stage is causing the malfunction.

isolated

DC current flows following the path of least resistance beginning from the _________ (-) to the __________ (+).

Ground, power

The __________ amplifies the audio signal to a sufficient level to fully modulate the RF carrier?

Modulator

The higher the conductivity of the surface, the _________ the attenuation.

Lower

T/F Propagation is better over dry terrain than over water.

False

_________ is accomplished by substituting the signal normally present at selected test points with a similar signal from a signal generator.

Signal injection

Sending and receiving information without the use of connecting wires describes ______ communications.

Radio

The bending of an electromagnetic wave when it passes from one medium to another is called _______

Refraction

What basic function or receiver fundamentals occurs when a transmitted electromagnetic wave passes through the receiver antenna and induces a voltage in the antenna?

Reception

What prevents excessive energy loss and radiation between RF circuits?

Shielded Cable

What section of the receiver extracts intelligence from the modulated radio frequency (RF) signal?

Detector

What phenomenon makes radio reception possible behind a mountain or tall building?

Defraction

All different frequencies are known as _______.

Lower Sideband

What are the basic sections of an AM receiver?

Antenna, Selector, detector, and Reproducer

The ability of a receiver to reproduce weak signals is ________.

Sensitivity

What amplifies the audio signal to a sufficient level to fully modulate the RF carrier?

Modulator

The resulting signal of a (an) ____________ travels effectively over long distances.

Transmitter

What radio processing technique results in four output frequencies being produced by combining or mixing two frequencies?

Heterodyning

What section of the receiver converts audio frequency (AF) voltage signals to sound waves?

Reproducer section

DC current will flow from ground (-) to the power supply (+), following the path of _________ _________.

Least resistance

The defective component will be located between the last ____ reading and the first good reading.

Bad

Capacitors will most commonly ______. This will be indicated by the same resistance measured on both sides of a capacitor.

Short

Inductors will most commonly ______.

Open

____________ block DC current flow and represent an infinite resistance to DC current once they are charged.

Capacitors

The six steps of troubleshooting a defective component are symptom recognition, symptom elaboration, listing of probable faulty functions, localizing the faulty function, localizing the trouble to a defective circuit, and _______ ________.

Failure Analysis

What basic function of receiver fundamentals occurs when a transmitted electromagnetic wave passes through the receiver antenna and induces a voltage in the antenna?

Reception

________ is the ability to separate a desired frequency from all other frequencies.

selectivity

A basic FM transmitter combines a (an) ______ signal with the carrier signal.

Audio

_________ presents little or no resistance (usually 0 to 5 Ohms) to DC current flow when the current is steady.

Inductors

_______ will open or short.

Diodes

________ ________ is a troubleshooting technique that is accomplished by following the normal input signal through the equipment using an oscilloscope.

signal tracing

The six steps of troubleshooting a defective component are symptom recognition, symptom elaboration, listing of probable faulty functions, ________ the faulty function, localizing the trouble of a defective circuit, and failure analysis.

Localizing

The technician's mantra is between the ______ and the _______ is the ugly.

Good, Bad

A number of basic parts or subassemblies, or any combination thereof, joined together to perform a specific function; is an example of?

Assembly

_______ _______ shows the components and electrical interconnections of a circuit using standardized symbolic representations.

Schematic diagram

A disadvantage of a basic AM receiver is _____ _____ sensitivity.

very poor

In a basic transmitter, what combines the RF carrier with the audio signal to produce the AM signal that is to be transmitted and increases the power of the carrier signal?

RF power amplifier

The defective circuit of a transistor can be isolated using voltage measurements. ________ checks will confirm this.

Resistance

______ ______ Provides terminal points for connection of audio signal devices.

Audio jacks

______ ______ is required for half splitting bracketing.

Block diagram

Listing the probable faulty functions is the _____ step of troubleshooting.

Third

In order to troubleshoot to a defective component, a path from the _________ _______ to ground must be determined.

power supply

The defective circuit of a transistor can be isolated using _______ measurements. Resistance checks will confirm this.

voltage

_______ _______ prevents external voltages from affecting the signal being passed between audio circuits; reduces undesirable noise.

Shielded cable

What section of the receiver intercept radio waves and transformer couples the radio waves to the selector section?

Antenna

The ______ diagram gives an overall visual representation of functional units of an electronic system and the signal paths between units.

Block

The six steps of troubleshooting a defective component are symptom recognition, ________ ___________, listing of probable faulty functions, localizing the faulty function, localizing the trouble to a defective circuit, and failure analysis.

Symptom elaboration

A unit or units and necessary assemblies, subassemblies, and basic parts connected or associated together to perform an operational function; is an example of?

Set

The _________ ________ is used to trace the circuit and its functions without regard to the actual physical size, shape, or location of the component devices or parts.

Schematic diagram

In SSB transmitters, only one of the sidebands, the upper or lower, is transmitted while the remaining sideband and the carrier are _________.

suppressed

The function of converting the AF voltage signals to sound waves that can be interpreted by your ear as speech and music is known as __________.

Reproduction

_______ _______ is an exact multiple of a fundamental frequency.

True harmonic

What is known as the process in which new frequencies are created by combining or mixing two frequencies?

Heterodyning

What are most AM broadcast used for?

voice communications

_______ section of the receiver extracts the intelligence from the modulated radio frequency (RF) signal.

Detector

_______ _______ is a detailed diagram of each circuit installation showing all of the wiring, connectors, terminal boards, and electrical or electronic components of the circuit.

Wiring diagram

A major building block for a set or system, consisting of a combination of basic parts, subassemblies, and assemblies packaged together as a physically independent entity; is an example of?

Unit