What is the correct adjustment for the load or coupling control of a vacuum tube RF power amplifier?

Maximum power output without exceeding maximum allowable plate current

Minimum plate current without exceeding maximum allowable grid current

Highest plate voltage while minimising grid current

Why is a time delay sometimes included in a transmitter keying circuit?

To allow time for transmit-receive changeover operations to complete properly before RF output is allowed

To prevent stations from interfering with one another

To allow the transmitter power regulators to charge properly

To allow time for a warning signal to be sent to other stations

What is the purpose of an electronic keyer?

Automatic generation of strings of dots and dashes for CW operation

Automatic transmit/receive switching

Computer interfaces for PSK and RTTY operation

Which of the following is a use for the IF shift control on a receiver?

To avoid interference from stations very close to the receive frequency

To permit listening on a different frequency from that on which you are transmitting

To tune in, stations that are slightly off frequency without changing transmitting frequency

Which of the following is a common use for the dual VFO feature on a transceiver?

To permit monitoring of two different frequencies

To allow transmitting on two frequencies at once

To permit full duplex operation, that is transmitting and receiving at the same time

To facilitate computer interface

What is one reason to use the attenuator function that is present on many HF transceivers?

To reduce signal overload due to strong incoming signals

To reduce the transmitter power when driving a linear amplifier

To reduce power consumption when operating from batteries

To slow down received CW signals for better copy

What is likely to happen if a transceiver's ALC system is not properly set when transmitting AFSK signals with the radio using single sideband mode?

Improper action of ALC distorts the signal and can cause spurious emissions

ALC will invert the modulation of the AFSK mode

When using digital modes, too much ALC activity can cause the transmitter to overheat

All of these choices are correct

Which of the following can be a symptom of transmitted RF being picked up by an audio cable carrying AFSK data signals between a computer and a transceiver?

All of these choices are correct

The VOX circuit does not unkey the transmitter

The transmitter signal is distorted

Which of the following is an advantage of an oscilloscope versus a digital voltmeter?

Complex waveforms can be measured

An oscilloscope applied less power consumption

Complex impedances can be easily measured

What signal source is connected to the vertical input of an oscilloscope when checking the RF envelope pattern of a transmitted signal?

The attenuated RF output of the transmitter

The local oscillator of the transmitter

The transmitter balanced mixer output

Why is high input impedance desirable for a voltmeter?

It decreases the loading on circuits being measured

It improves the frequency response

It decreases battery consumption in the meter

It improves the resolution of the readings

What is an advantage of a digital voltmeter as compared to an analogue voltmeter?

Better for measuring computer circuits

What signals are used to conduct a two-tone test?

Two non-harmonically related audio signals

Two audio signals of the same frequency shifted 90 degrees

Two audio frequency range square wave signals of equal amplitude

Which of the following can be determined with a field strength meter?

The radiation pattern of an antenna

The radiation resistance of an antenna

The presence and amount of phase distortion of a transmitter

The presence and amount of amplitude distortion of a transmitter

Which of the following must be connected to an antenna analyser when it is being used for SWR measurements?

All of these choices are correct

What problem can occur when making measurements on an antenna system with an antenna analyser?

Strong signals from nearby transmitters can affect the accuracy of measurements

Permanent damage to the analyser may occur if it is operated into a high SWR

The analyser can be damaged if measurements outside the ham bands are attempted

Connecting the analyser to an antenna can cause it to absorb harmonics

What is a use for an antenna analyser other than measuring the SWR of an antenna system?

Determining the impedance of an unknown or unmarked coaxial cable

Measuring the front to back ratio of an antenna

Measuring the turns ratio of a power transformer

Determining the gain of a directional antenna

What is an instance in which the use of an instrument with analogue readout may be preferred over an instrument with a digital readout?

When measuring the frequency of an oscillator

What type of transmitter performance does a two-tone test analyse?

Percentage of suppression of carrier and undesired sideband for SSB

Percentage of frequency modulation

Percentage of carrier phase shift

Which of the following could be a cause of interference covering a wide range of frequencies?

Arcing at a poor electrical connection

Not using a balun or line isolator to feed balanced antennas

Lack of rectification of the transmitter's signal in power conductors

Using a balun to feed an unbalanced antenna

What sound is heard from an audio device or telephone if there is interference from a nearby single-sideband phone transmitter?

A steady hum whenever the transmitter is on the air

What is the effect on an audio device or telephone system if there is interference from a nearby CW transmitter?

A CW signal at a nearly pure audio frequency

What might be the problem if you receive an RF burn when touching your equipment while transmitting on an HF band, assuming the equipment is connected to a ground rod?

The ground wire has high impedance on that frequency

Flat braid rather than round wire has been used for the ground wire

Insulated wire has been used for the ground wire

What effect can be caused by a resonant ground connection?

High RF voltages on the enclosures of station equipment

What is one good way to avoid unwanted effects of stray RF energy in an amateur station?

Connect all equipment grounds together

Install an RF filter in series with the ground wire

Use a ground loop for best conductivity

Install a few ferrite beads on the ground wire where it connects to your station

Which of the following would reduce RF interference caused by the common-mode current on an audio cable?

Placing a ferrite choke around the cable

Adding series capacitors to the conductors

Adding shunt inductors to the conductors

Adding an additional insulating jacket to the cable

How can a ground loop be avoided?

Connect all ground conductors to a single point

Connect all ground conductors in series

Connect the AC neutral conductor to the ground wire

Avoid using lock washers and star washers when making ground connections

What could be a symptom of a ground loop somewhere in your station?

You receive reports of 'hum' on your station's transmitted signal

The SWR reading for one or more antennas is suddenly very high

An item of station equipment starts to draw excessive amounts of current

You receive reports of harmonic interference from your station

Which of the following is a function of a digital signal processor?

To remove noise from received signals

Which of the following is an advantage of a receiver DSP IF filter as compared to an analogue filter?

A wide range of filter bandwidths and shapes can be created

Fewer digital components are required

Mixing products are greatly reduced

The DSP filter is much more effective at VHF frequencies

Which of the following can perform automatic notching of interfering carriers?

A Digital Signal Processor (DSP) filter

What is the purpose of a speech processor as used in a modern transceiver?

Increase the intelligibility of transmitted phone signals during poor conditions

Increase transmitter bass response for more natural sounding SSB signals

Prevent distortion of voice signals

Decrease high-frequency voice output to prevent out of band operation

Which of the following describes how a speech processor affects a transmitted single-sideband phone signal?

It reduces intermodulation distortion

Which of the following can be the result of an incorrectly adjusted speech processor?

All of these choices are correct

ORAE Class B Part 08 - Interference

Authored by Woki Toki

Other

Vocational training

Used 30+ times

AI Actions

Add similar questions

Adjust reading levels

Convert to real-world scenario

Translate activity

More...

Content View

Student View

65 questions

Show all answers

Access all questions and much more by creating a free account

Create resources

Host any resource

Get auto-graded reports

Continue with Google

Continue with Email

Continue with Classlink

Continue with Clever

or continue with

Microsoft

Apple

Others

Already have an account?

Popular Resources on Wayground

15 questions

Fractions on a Number Line

Quiz

•

3rd Grade

20 questions

Equivalent Fractions

Quiz

•

3rd Grade

25 questions

Multiplication Facts

Quiz

•

5th Grade

$fractions$

22 questions

fractions

Quiz

•

3rd Grade

20 questions

Main Idea and Details

Quiz

•

5th Grade

20 questions

Context Clues

Quiz

•

6th Grade

15 questions

Equivalent Fractions

Quiz

•

4th Grade

20 questions

Figurative Language Review

Quiz

•

6th Grade