The purpose of the EQ in a CATV amplifier is to:

Compensate for the cable loss

A ghost can be caused by:

Direct pick-up of off air signals by t.v receiver

Poor return loss at the tap feeding t.v

Missing end of line termination

Channel reflected and direct signal picked-up by headend antenna

Ingress is what in a CATV system

Undesired signal entering the cable plant

A beat may be caused by:

Unwanted carrier entering the system

Co-Channel interferrence

Amp running hot

The proper way to write decibel-millivolt:

dBmV

A stationary verticle bar in the video portion of a channel is:

Cross modulation

The log, to the base of 1000:

3

If the output level of a cascade of amps are raised by 3dB, the output of the last amp:

C/N improved by 3 dB and C/XMOD has degraded by 6 dB

If 2 carriers, one at 55MHz and one at 61 MHz are producing beats in an amp the only 2nd order frequencies these carriers could produce are:

110, 6, 116 & 122MHz

The difference in voltage between one point and another:

Potential Difference

Substance that allows heat or electricity to pass along or through it:

Conductor

The direction of an electrical field in a radiated wave:

Polarity

Subatomic particles found in the atoms that balance out the positive charge of a proton with there negative charge:

Electrons

An electrical current which polarity is periodically reversed:

Alternating current (AC)

A waveform can be displayed as:

Graph, continuous plot, and show the relationship between current and voltage and elapsed time

Types of waveforms are:

Sine, square, Quasi-square and saw tooth

A sine wave represents:

Voltage/current that feeds homes, power supplies and t.v channels

A square wave:

Found within the switching regulator D.C output power supplies in amps

A quasi-square wave:

A square wave the becomes slightly rounded when a 5 amp load is applied.  As load increases the square wave becomes more rounded

A sawtooth wave:

Waveform that is typically used to drive the horiziontal trace on an oscilloscope or spectrum analyzer

Wavelength can be defined as:

Physical length of one cylce of the voltage waveform

Velocity of propogation is:

The ratio of actual speed to the speed of light that is caused by the dielectric material

Wavelength =:

Speed of light/Frequency

The period of the wavelength is:

The amount of time it takes a waveform to complete one cycle

The amplitude of a waveform is:

The peak value of an AC waveform

Ohms law states that:

Current is directly proportional to voltage and inversely proportional to resistance

Formula for Ohms Law:

    E    

   I x R

D.C Loop resistance is:

The resistance measured between the center conductor and the sheath with the other end shorted

Unity gain is described as:

The loss of the cable and other passive devices before an amplifier station equal the gain of the amplifier

Coax attenuation formula:

AFN=AFO√FNxFO

A sweep resonse is the:

Effects of all of the network components such as connectors, passive devices, and signatures added by the amplifiers

Tilt is defined as the:

Difference in attenuation or amp gain between lower and higher frequencies

Slope is defined as:

The difference in gain between the ends of a band of frequencies

Roll off is defined as:

Gradual or sharp attenuation of gain at either or both ends of the spectrum

Suck out is defined as:

A sharp reduction in the amplitude of a narrow band of frequencies

An amplifier is:

An active device used to increase the level of an input signal

Signatures are the:

 Effect a type of amplifier has on the overall frequency response

The unity gain principle is used in the return portion as:

The attenuator and EQ is at the output of the return amp and compensates for cable and passive losses

Some of the effects of ingress are:

Beats, co-channel and electrical interference and ghosts

Beats can be described as:

Unwanted signal patterns that appear on the t.v screen

Ghosts are defined as:

When a signal arrives at the receiver just before or just after the desired signal

A leading ghost will:

Show up to the left of the desired picture

A following ghost will:

Show to the right of the desired picture

Phase locked is defined as:

A carrier with a different video source replaces the frequency slot of the channel that was moved to operate at exactly the same frequency as the off-air channel

Co-Channel interference can be defined as:

One channel by the carrier from another transmitter operating on the same channel

Zero Beats are defined as:

Using an RF current of the proper magnitude and phase relation so the recieved voltage is of the same nature as the original wave

Electrical interfence is caused by:

Sparkles in the picture from electrical ingress

Common path distortion is the:

Interference of the return path signals caused by the reaction of dissimilar metals found in the active and passive devices

Oxidation is caused by:

A chemical change caused by reaction to oxygen such as rust

Absolute Zero is the temperature equivalent:

The absolute absence of heat equal to -459.67 degrees F

Termination noise is defined as:

Noise added to the response due to a lack of or improper termination

Thermal noise is caused by:

Any temperature above absolute zero causes random electron activity of atoms that make up the conductor, resistor or any part of the passive circuit

Carrier to noise ratio is:

The difference in a peak carrier to the noise floor level

What is the Log(N) for C/N:

The Ring in a network can be defined as:

The purpose of the housing component is:

Introduces AC power into the network from the power supply