Test 12

What is the purpose of Electro communication systems ?

transfer information from one point to another instantaneously !

A device that converts voltage into sound waves ?

Speaker; Earbuds/ Headphones

Frequency Spectrum that is at the highest range ?

Super High Frequency

Super Low frequency is known as ?

Voice Frequency

The phenomenon that makes it possible to get radio wave signal behind buildings or mountains is ?

Defraftion

The higher the conductivity of a surface, means that the attenuation will be ____?

Lower

To modulate a signal , you must vary one of these three things _____,_____,______.

Amplitude, frequency, phase.

When new frequency’s are created by combining or mixing two frequencies, resulting in four output frequencies being produced it is called ?

Heterodyning

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

Modulator

What are the basic sections of an AM receiver?

Antenna, Selector, Detector, Reproducer

What is the ability of a receiver to reproduce weak signals ?

Sensitivity

Section of a receiver that intercepts radio waves.

Antenna

What gives an overall representation visually of the functions of an electronic system and signal paths between them.

Block Diagram

What prevents external voltages from escaping and effecting the signal being passed between audio circuits?

Shielded Cable

What kind of diagrams do you have to have to use the Half split Bracketing method of troubleshooting?

Block Diagram/ Schematic Diagram

Troubleshooting Step 1

Symptom Recognition

Troubleshooting Step 2

System Elaboration

Troubleshooting Step 3

Listing of Probable Faulty Functions

Troubleshooting Step 4

Localizing Faulty Function

Troubleshooting Step 5

Localizing Trouble to a Detective Circuit

Troubleshooting Step 6

Failure Analysis

In order to troubleshoot a defective component, a path from the ________ to ground must be determined

Transistor element

When signal injecting troubleshooting an AM transistor, you go to the closest input ______ and listen for a tone .

Split points

Antenna

Tuner

detector

Amplifier

Speaker

Mechanical Linkage

Magnetic Shield

Male Connector

Female Connector

Audio Jacks

Indicator Switch

Selector Switch

What is the second harmonic of a fundamental frequency of 2500

5000

What is the 5th harmonic of fundamental frequency of 1000

5000

What is the 3rd sub harmonic of 3000

1000

What is the 2nd sub harmonic of the fundamental frequency of 2500

1250

What is the lower sideband?

Difference

What is the upper sideband?

Sum