# HamTestOnline™ Course Structure

## General Course

### (valid 07/01/15 - 06/30/19)

General Exam Online Course
Quick Review of Basic Electronics
from the Technician Course
How many watts of electrical power are used by a 12 VDC light bulb that draws 0.2 amperes?
2.4 watts
How many watts of electrical power are used if 400 VDC is supplied to an 800 ohm load?
200 watts
How many watts are dissipated when a current of 7.0 milliamperes flows through 1.25 kilohms resistance?
Approximately 61 milliwatts
Heating of Resistors
What will happen to the resistance if the temperature of a resistor is increased?
It will change depending on the resistor's temperature coefficient
Cell/Battery Review
When is it acceptable to recharge a carbon-zinc primary cell?
Never
What is the minimum allowable discharge voltage for maximum life of a standard 12 volt lead acid battery?
10.5 volts
What is an advantage of the low internal resistance of nickel-cadmium batteries?
High discharge current
Solar and Wind Power
What is the name of the process by which sunlight is changed directly into electricity?
Photovoltaic conversion
What is the approximate open-circuit voltage from a fully illuminated silicon photovoltaic cell?
0.5 VDC
What is the reason that a series diode is connected between a solar panel and a storage battery that is being charged by the panel?
The diode prevents self-discharge of the battery through the panel during times of low or no illumination
Which of the following is a disadvantage of using wind as the primary source of power for an emergency station?
A large energy storage system is needed to supply power when the wind is not blowing
Resistors in Series and Parallel
Which of the following components should be added to an existing resistor to increase the resistance?
A resistor in series
What is the total resistance of three 100 ohm resistors in parallel?
33.3 ohms
If three equal value resistors in series produce 450 ohms, what is the value of each resistor?
150 ohms
What is the total resistance of a 10 ohm, a 20 ohm, and a 50 ohm resistor connected in parallel?
5.9 ohms
Kirchhoff's Current Law
How does the total current relate to the individual currents in each branch of a purely resistive parallel circuit?
It equals the sum of the currents through each branch
Household Power
What value of an AC signal produces the same power dissipation in a resistor as a DC voltage of the same value?
The RMS value
What is the RMS voltage of a sine wave with a value of 17 volts peak?
12 volts
American Wire Gauge (AWG)
What is the minimum wire size that may be safely used for a circuit that draws up to 20 amperes of continuous current?
AWG number 12
Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring?
15 amperes
Safety Ground
Which of the following is covered by the National Electrical Code?
Electrical safety inside the ham shack
Why must the metal enclosure of every item of station equipment be grounded?
It ensures that hazardous voltages cannot appear on the chassis
Which of the following conditions will cause a Ground Fault Circuit Interrupter (GFCI) to disconnect the 120 or 240 Volt AC line power to a device?
Current flowing from one or more of the voltage-carrying wires directly to ground
Which wire or wires in a four-conductor connection should be attached to fuses or circuit breakers in a device operated from a 240 VAC single phase source?
Only the two wires carrying voltage
What is the purpose of a power supply interlock?
To ensure that dangerous voltages are removed if the cabinet is opened
Solder
Which of the following is a danger from lead-tin solder?
Lead can contaminate food if hands are not washed carefully after handling the solder
Dipole Antenna
What is the approximate length for a 1/2 wave dipole antenna cut for 3.550 MHz?
131 feet
What is the approximate length for a 1/2 wave dipole antenna cut for 14.250 MHz?
32 feet
Vertical Antenna
Where should the radial wires of a ground-mounted vertical antenna system be placed?
On the surface of the Earth or buried a few inches below the ground
What is the approximate length for a 1/4 wave vertical antenna cut for 28.5 MHz?
8 feet
Station Ground
Which of the following is good practice for lightning protection grounds?
They must be bonded together with all other grounds
What is one disadvantage of a directly fed random-wire HF antenna?
You may experience RF burns when touching metal objects in your station
What is one good way to avoid unwanted effects of stray RF energy in an amateur station?
Connect all equipment grounds together
How can a ground loop be avoided?
Connect all ground conductors to a single point
What could be a symptom of a ground loop somewhere in your station?
What effect can be caused by a resonant ground connection?
High RF voltages on the enclosures of station equipment
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
Tower Safety
What precaution should you take whenever you make adjustments or repairs to an antenna?
Turn off the transmitter and disconnect the feed line
Which of these choices should be observed when climbing a tower using a safety belt or harness?
Confirm that the belt is rated for the weight of the climber and that it is within its allowable service life
What should be done by any person preparing to climb a tower that supports electrically powered devices?
Make sure all circuits that supply power to the tower are locked out and tagged
Tower Grounding
Why should soldered joints not be used with the wires that connect the base of a tower to a system of ground rods?
A soldered joint will likely be destroyed by the heat of a lightning strike
Station Identification
What language must be used when identifying your station if you are using a language other than English in making a contact using phone emission?
English only
ARRL / Amateur Auxiliary
What is the Amateur Auxiliary to the FCC?
Amateur volunteers who are formally enlisted to monitor the airwaves for rules violations
Which of the following are objectives of the Amateur Auxiliary?
To encourage self-regulation and compliance with the rules by radio amateur operators
What skills learned during hidden transmitter hunts are of help to the Amateur Auxiliary?
Direction finding used to locate stations violating FCC Rules
RACES and ARES
Who may be the control operator of an amateur station transmitting in RACES to assist relief operations during a disaster?
Only a person holding an FCC issued amateur operator license
FAA Antenna Height Restrictions
What is the maximum height above ground to which an antenna structure may be erected without requiring notification to the FAA and registration with the FCC, provided it is not at or near a public use airport?
200 feet
Good Engineering and Good Amateur Practice
How does the FCC require an amateur station to be operated in all respects not specifically covered by the Part 97 rules?
In conformance with good engineering and good amateur practice
Who or what determines "good engineering and good amateur practice" as applied to the operation of an amateur station in all respects not covered by the Part 97 rules?
The FCC
Third-party Communications
Which of the following is a requirement for a non-licensed person to communicate with a foreign Amateur Radio station from a station with an FCC-granted license at which an FCC licensed control operator is present?
The foreign amateur station must be in a country with which the United States has a third party agreement
With which foreign countries is third party traffic prohibited, except for messages directly involving emergencies or disaster relief communications?
Every foreign country, unless there is a third party agreement in effect with that country
Which of the following would disqualify a third party from participating in stating a message over an amateur station?
The third party’s amateur license has been revoked and not reinstated
What types of messages for a third party in another country may be transmitted by an amateur station?
Only messages relating to Amateur Radio or remarks of a personal character, or messages relating to emergencies or disaster relief
Under what circumstances are messages that are sent via digital modes exempt from Part 97 third party rules that apply to other modes of communication?
Under no circumstances
Volunteer Examiners
Volunteer Examiners are accredited by what organization?
A Volunteer Examiner Coordinator
What is the minimum age that one must be to qualify as an accredited Volunteer Examiner?
18 years
Which of the following criteria must be met for a non-U.S. citizen to be an accredited Volunteer Examiner?
The person must hold an FCC granted Amateur Radio license of General Class or above
Minimum VE Requirements
Which of the following must a person have before they can be an administering VE for a Technician Class license examination?
An FCC General Class or higher license and VEC accreditation
Which of the following is a requirement for administering a Technician Class license examination?
At least three General Class or higher VEs must observe the examination
What license examinations may you administer when you are an accredited VE holding a General Class operator license?
Technician only
Exam Credit
Any person who can demonstrate that they once held an FCC issued General, Advanced, or Amateur Extra class license that was not revoked by the FCC
If a person has an expired FCC issued amateur radio license of General Class or higher, what is required before they can receive a new license?
The applicant must pass the current element 2 exam
How long is a Certificate of Successful Completion of Examination (CSCE) valid for exam element credit?
365 days
Authorized Technician, General, or Extra
On which of the following band segments may you operate if you are a Technician Class operator and have a CSCE for General Class privileges?
On any General or Technician Class band segment
When must you add the special identifier "AG" after your call sign if you are a Technician Class licensee and have a CSCE for General Class operator privileges, but the FCC has not yet posted your upgrade on its website?
Whenever you operate using General Class frequency privileges
Basic Procedural Signals
What is the best speed to use when answering a CQ in Morse code?
The speed at which the CQ was sent
What does the expression "CQ DX" usually indicate?
The caller is looking for any station outside their own country
What does it mean when a CW operator sends "KN" at the end of a transmission?
Listening only for a specific station or stations
Which of the following is a recommended way to break into a contact when using phone?
Say your call sign during a break between transmissions by the other stations
What prosign is sent to indicate the end of a formal message when using CW?
AR
Frequency Coordinator
Which of the following applies in the event of interference between a coordinated repeater and an uncoordinated repeater?
The licensee of the uncoordinated repeater has primary responsibility to resolve the interference
Emergency Communications
What is the first thing you should do if you are communicating with another amateur station and hear a station in distress break in?
Acknowledge the station in distress and determine what assistance may be needed
When is an amateur station allowed to use any means at its disposal to assist another station in distress?
At any time during an actual emergency
What frequency should be used to send a distress call?
Whichever frequency has the best chance of communicating the distress message
War Emergency Powers
When may the FCC restrict normal frequency operations of amateur stations participating in RACES?
When the President’s War Emergency Powers have been invoked
Emergency Generator
Which of the following is true of an emergency generator installation?
The generator should be located in a well-ventilated area
Which of the following is a primary reason for not placing a gasoline-fueled generator inside an occupied area?
Danger of carbon monoxide poisoning
What must you do when powering your house from an emergency generator?
Disconnect the incoming utility power feed
Introduction to Q Signals
What does the Q signal "QRN" mean?
I am troubled by static
What does the Q signal "QSL" mean?
I acknowledge receipt
What is QRP operation?
Low power transmit operation
What does the Q signal "QRL?" mean?
"Are you busy?", or "Is this frequency in use?"
What should you do if a CW station sends "QRS"?
Send slower
What does the Q signal "QRV" mean?
Mobile Operating Hints
Why is it best NOT to draw the DC power for a 100 watt HF transceiver from a vehicle’s auxiliary power socket?
The socket's wiring may be inadequate for the current drawn by the transceiver
Which of the following direct, fused power connections would be the best for a 100 watt HF mobile installation?
To the battery using heavy gauge wire
Which of the following may cause interference to be heard in the receiver of an HF radio installed in a recent model vehicle?
All of these choices are correct
Which of the following statements is true of voice VOX operation versus PTT operation?
It allows "hands free" operation
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
Split Operation
What is normally meant by operating a transceiver in "split" mode?
The transceiver is set to different transmit and receive frequencies
Which of the following is a common use for the dual VFO feature on a transceiver?
To permit monitoring of two different frequencies
Station Log
What information is traditionally contained in a station log?
All of these choices are correct
What is a reason why many amateurs keep a station log?
To help with a reply if the FCC requests information
Which communication system sometimes uses the Internet to transfer messages?
Prohibited Transmissions
What is a practical way to avoid harmful interference on an apparently clear frequency before calling CQ on CW or phone?
Send "QRL?" on CW, followed by your call sign; or, if using phone, ask if the frequency is in use, followed by your call sign
Which of the following is true concerning access to frequencies in non-emergency situations?
Except during FCC declared emergencies, no one has priority access to frequencies
If propagation changes during your contact and you notice increasing interference from other activity on the same frequency, what should you do?
As a common courtesy, move your contact to another frequency
Which of the following conditions require a licensed Amateur Radio operator to take specific steps to avoid harmful interference to other users or facilities?
All of these choices are correct
When is it permissible to communicate with amateur stations in countries outside the areas administered by the Federal Communications Commission?
When the contact is with amateurs in any country except those whose administrations have notified the ITU that they object to such communications
Prohibited Transmissions — Codes and ciphers
When is an amateur station permitted to transmit secret codes?
To control a space station
What are the restrictions on the use of abbreviations or procedural signals in the Amateur Service?
They may be used if they do not obscure the meaning of a message
Prohibited Transmissions — Compensation
When may an amateur station transmit communications in which the licensee or control operator has a pecuniary (monetary) interest?
When other amateurs are being notified of the sale of apparatus normally used in an amateur station and such activity is not done on a regular basis
Which of the following must be true before amateur stations may provide communications to broadcasters for dissemination to the public?
The communications must directly relate to the immediate safety of human life or protection of property and there must be no other means of communication reasonably available before or at the time of the event
Prohibited Transmissions — Music
When may music be transmitted by an amateur station?
When it is an incidental part of a manned space craft retransmission
Oscilloscope
What item of test equipment contains horizontal and vertical channel amplifiers?
An oscilloscope
Which of the following is an advantage of an oscilloscope versus a digital voltmeter?
Complex waveforms can be measured
Which of the following is the best instrument to use when checking the keying waveform of a CW transmitter?
An oscilloscope
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
Peak Envelope Power
What is the modulation envelope of an AM signal?
The waveform created by connecting the peak values of the modulated signal
What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output?
100 watts
What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50 ohm resistive load connected to the transmitter output?
625 watts
What would be the RMS voltage across a 50 ohm dummy load dissipating 1200 watts?
245 volts
PEP of an Unmodulated Carrier
What is the ratio of peak envelope power to average power for an unmodulated carrier?
1.00
What is the output PEP of an unmodulated carrier if an average reading wattmeter connected to the transmitter output indicates 1060 watts?
1060 watts
Transmitter Power
Which of the following limitations apply to transmitter power on every amateur band?
Only the minimum power necessary to carry out the desired communications should be used
Which of the following is a limitation on transmitter power on the 1.8 MHz band?
1500 watts PEP output
What is the maximum transmitting power an amateur station may use on the 12-meter band?
1500 watts PEP output
Which of the following is a limitation on transmitter power on the 28 MHz band for a General Class control operator?
1500 watts PEP output
What is the maximum transmitting power an amateur station may use on 10.140 MHz?
200 watts PEP output
Decibel
What dB change represents a two-times increase or decrease in power?
Approximately 3 dB
What percentage of power loss would result from a transmission line loss of 1 dB?
20.5 percent
Antenna Gain
Which HF antenna would be the best to use for minimizing interference?
A directional antenna
What is meant by the terms dBi and dBd when referring to antenna gain?
dBi refers to an isotropic antenna, dBd refers to a dipole antenna
How does antenna gain stated in dBi compare to gain stated in dBd for the same antenna?
dBi gain figures are 2.15 dB higher than dBd gain figures
Azimuthal Projection Map
Which of the following describes an azimuthal projection map?
A map that shows true bearings and distances from a particular location
What is meant by the "main lobe" of a directive antenna?
The direction of maximum radiated field strength from the antenna
Effect on Radiation Pattern of Ground and Other Objects
What is the radiation pattern of a dipole antenna in free space in the plane of the conductor?
It is a figure-eight at right angles to the antenna
How does antenna height affect the horizontal (azimuthal) radiation pattern of a horizontal dipole HF antenna?
If the antenna is less than 1/2 wavelength high, the azimuthal pattern is almost omnidirectional
What does the term "critical angle" mean as used in radio wave propagation?
The highest takeoff angle that will return a radio wave to the Earth under specific ionospheric conditions
Yagi Antenna
Which statement about a three-element, single-band Yagi antenna is true?
The director is normally the shortest element
Which statement about a three-element, single-band Yagi antenna is true?
The reflector is normally the longest element
What is the approximate length of the driven element of a Yagi antenna?
1/2 wavelength
What does "front-to-back ratio" mean in reference to a Yagi antenna?
The power radiated in the major radiation lobe compared to the power radiated in exactly the opposite direction
Yagi Design
Which of the following is a Yagi antenna design variable that could be adjusted to optimize forward gain, front-to-back ratio, or SWR bandwidth?
All of these choices are correct
How does increasing boom length and adding directors affect a Yagi antenna?
Gain increases
Stacked Yagis
What is an advantage of vertical stacking of horizontally polarized Yagi antennas?
It narrows the main lobe in elevation
How does the gain of two 3-element horizontally polarized Yagi antennas spaced vertically 1/2 wavelength apart typically compare to the gain of a single 3-element Yagi?
Approximately 3 dB higher
Yagi Antenna Bandwidth
Which of the following would increase the bandwidth of a Yagi antenna?
Larger diameter elements
Multiband Trap Antennas and Harmonic Radiation
What is the primary purpose of antenna traps?
To permit multiband operation
Which of the following is a disadvantage of multiband antennas?
They have poor harmonic rejection
Log Periodic Antenna
Which of the following describes a log periodic antenna?
Length and spacing of the elements increase logarithmically from one end of the boom to the other
Which of the following is an advantage of a log periodic antenna?
Wide bandwidth
Approximately how long is each side of the driven element of a quad antenna?
1/4 wavelength
What configuration of the loops of a two-element quad antenna must be used for the antenna to operate as a beam antenna, assuming one of the elements is used as a reflector?
The reflector element must be approximately 5 percent longer than the driven element
Approximately how long is each side of the reflector element of a quad antenna?
Slightly more than 1/4 wavelength
Approximately how long is each leg of a symmetrical delta-loop antenna?
1/3 wavelength
How does the gain of a two-element delta-loop beam compare to the gain of a two-element quad antenna?
How does the forward gain of a two-element quad antenna compare to the forward gain of a three-element Yagi antenna?
Beverage Antenna
Which of the following describes a Beverage antenna?
A very long and low directional receiving antenna
Which of the following is an application for a Beverage antenna?
Directional receiving for low HF bands
Why is a Beverage antenna not used for transmitting?
It has high losses compared to other types of antennas
RF Safety
What is one way that RF energy can affect human body tissue?
It heats body tissue
What precaution should you take if you install an indoor transmitting antenna?
Make sure that MPE limits are not exceeded in occupied areas
What precaution should be taken when installing a ground-mounted antenna?
It should be installed such that it is protected against unauthorized access
Field Strength and Power Density
What type of instrument can be used to accurately measure an RF field?
A calibrated field strength meter with a calibrated antenna
Which of the following instruments may be used to monitor relative RF output when making antenna and transmitter adjustments?
A field strength meter
Which of the following can be determined with a field strength meter?
The radiation pattern of an antenna
Duty Cycle
What does "time averaging" mean in reference to RF radiation exposure?
The total RF exposure averaged over a certain time
What effect does transmitter duty cycle have when evaluating RF exposure?
A lower transmitter duty cycle permits greater short-term exposure levels
Specific absorption rate (SAR)
Which of the following properties is important in estimating whether an RF signal exceeds the maximum permissible exposure (MPE)?
All of these choices are correct
Routine RF environmental evaluation
Which of the following steps must an amateur operator take to ensure compliance with RF safety regulations when transmitter power exceeds levels specified in FCC Part 97.13?
Perform a routine RF exposure evaluation
How can you determine that your station complies with FCC RF exposure regulations?
All of these choices are correct
What must you do if an evaluation of your station shows RF energy radiated from your station exceeds permissible limits?
Take action to prevent human exposure to the excessive RF fields
What is one thing that can be done if evaluation shows that a neighbor might receive more than the allowable limit of RF exposure from the main lobe of a directional antenna?
Take precautions to ensure that the antenna cannot be pointed in their direction
Layers of the Earth's Atmosphere
Regions of the Ionosphere
Which ionospheric layer is closest to the surface of the Earth?
The D layer
Which ionospheric layer is the most absorbent of long skip signals during daylight hours on frequencies below 10 MHz?
The D layer
Why is long distance communication on the 40-meter, 60-meter, 80-meter and 160-meter bands more difficult during the day?
The D layer absorbs signals at these frequencies during daylight hours
Why is the F2 region mainly responsible for the longest distance radio wave propagation?
Because it is the highest ionospheric region
Where on the Earth do ionospheric layers reach their maximum height?
Polarization
What happens when the feed point of a quad antenna of any shape is moved from the midpoint of the top or bottom to the midpoint of either side?
The polarization of the radiated signal changes from horizontal to vertical
Which of the following is an advantage of a horizontally polarized as compared to a vertically polarized HF antenna?
Lower ground reflection losses
Multi-hop Propagation
What is the approximate maximum distance along the Earth's surface that is normally covered in one hop using the F2 region?
2,500 miles
What is the approximate maximum distance along the Earth's surface that is normally covered in one hop using the E region?
1,200 miles
Long-Path Propagation
How is a directional antenna pointed when making a "long-path" contact with another station?
180 degrees from its short-path heading
How might a sky-wave signal sound if it arrives at your receiver by both short path and long path propagation?
A well-defined echo might be heard
What effect does a high sunspot number have on radio communications?
Long-distance communication in the upper HF and lower VHF range is enhanced
What is the significance of the sunspot number with regard to HF propagation?
Higher sunspot numbers generally indicate a greater probability of good propagation at higher frequencies
Approximately how long is the typical sunspot cycle?
11 years
What is the solar flux index?
A measure of solar radiation at 10.7 centimeters wavelength
What causes HF propagation conditions to vary periodically in a 28 day cycle?
The Sun’s rotation on its axis
Sudden Ionospheric Disturbance
What effect does a Sudden Ionospheric Disturbance have on the daytime ionospheric propagation of HF radio waves?
It disrupts signals on lower frequencies more than those on higher frequencies
Approximately how long does it take the increased ultraviolet and X-ray radiation from solar flares to affect radio propagation on the Earth?
8 minutes
Geomagnetic Storms
What is a geomagnetic storm?
A temporary disturbance in the Earth's magnetosphere
How long does it take charged particles from coronal mass ejections to affect radio propagation on the Earth?
20 to 40 hours
How are radio communications usually affected by the charged particles that reach the Earth from solar coronal holes?
HF communications are disturbed
Which of the following effects can a geomagnetic storm have on radio propagation?
What does the K-index indicate?
The short term stability of the Earth’s magnetic field
What does the A-index indicate?
The long term stability of the Earth’s geomagnetic field
Lowest Usable Frequency (LUF)
Maximum Usable Frequency (MUF)
What does LUF stand for?
The Lowest Usable Frequency for communications between two points
What usually happens to radio waves with frequencies below the LUF?
They are completely absorbed by the ionosphere
What does MUF stand for?
The Maximum Usable Frequency for communications between two points
What factor or factors affect the MUF?
All of these choices are correct
What usually happens to radio waves with frequencies below the MUF and above the LUF when they are sent into the ionosphere?
They are bent back to the Earth
What happens to HF propagation when the LUF exceeds the MUF?
No HF radio frequency will support ordinary sky-wave communications over the path
Which of the following applies when selecting a frequency for lowest attenuation when transmitting on HF?
Select a frequency just below the MUF
Which of the following are least reliable for long distance communications during periods of low solar activity?
15 meters, 12 meters and 10 meters
At what point in the solar cycle does the 20-meter band usually support worldwide propagation during daylight hours?
At any point in the solar cycle
Beacon
Which of the following is a purpose of a beacon station as identified in the FCC rules?
Observation of propagation and reception
With which of the following conditions must beacon stations comply?
There must be no more than one beacon signal transmitting in the same band from the same station location
What is the power limit for beacon stations?
100 watts PEP output
What is a reliable way to determine if the MUF is high enough to support skip propagation between your station and a distant location on frequencies between 14 and 30 MHz?
Listen for signals from an international beacon in the frequency range you plan to use
Near Vertical Incidence Skywave (NVIS)
What does the term NVIS mean as related to antennas?
Near Vertical Incidence sky-wave
What is Near Vertical Incidence Sky-wave (NVIS) propagation?
Short distance MF or HF propagation using high elevation angles
Which of the following is an advantage of an NVIS antenna?
High vertical angle radiation for working stations within a radius of a few hundred kilometers
At what height above ground is an NVIS antenna typically installed?
Between 1/10 and 1/4 wavelength
Which of the following antenna types will be most effective for skip communications on 40-meters during the day?
A horizontal dipole placed between 1/8 and 1/4 wavelength above the ground
Which of the following is a good indicator of the possibility of sky-wave propagation on the 6-meter band?
Short skip sky-wave propagation on the 10-meter band
HF Scatter
What type of radio wave propagation allows a signal to be detected at a distance too far for ground wave propagation but too near for normal sky-wave propagation?
Scatter
Why are HF scatter signals in the skip zone usually weak?
Only a small part of the signal energy is scattered into the skip zone
What makes HF scatter signals often sound distorted?
Energy is scattered into the skip zone through several different radio wave paths
What is a characteristic of HF scatter signals?
They have a wavering sound
Which of the following might be an indication that signals heard on the HF bands are being received via scatter propagation?
The signal is heard on a frequency above the Maximum Usable Frequency
Auroral Propagation
What is a possible benefit to radio communications resulting from periods of high geomagnetic activity?
Auroras that can reflect VHF signals
Analog Versus Digital
What is an advantage of a digital voltmeter as compared to an analog voltmeter?
Better precision for most uses
What is an instance in which the use of an instrument with analog readout may be preferred over an instrument with a digital readout?
Computer Terminology
What is a microprocessor?
A computer on a single integrated circuit
Complex digital circuitry can often be replaced by what type of integrated circuit?
Microcontroller
What is meant when memory is characterized as non-volatile?
The stored information is maintained even if power is removed
What is meant by the term ROM?
Which of the following is an advantage of using the binary system when processing digital signals?
Binary "ones" and "zeros" are easy to represent by an "on" or "off" state
How many states does a 3-bit binary counter have?
8
What is a shift register?
A clocked array of circuits that passes data in steps along the array
Logic Circuits
Which of the following describes the function of a two input AND gate?
Output is high only when both inputs are high
Which of the following describes the function of a two input NOR gate?
Output is low when either or both inputs are high
AM and FM
What type of modulation varies the instantaneous power level of the RF signal?
Amplitude modulation
Single-Sideband (SSB)
Which mode of voice communication is most commonly used on the HF amateur bands?
Single sideband
Which of the following statements is true of the single sideband voice mode?
Only one sideband is transmitted; the other sideband and carrier are suppressed
What is one advantage of carrier suppression in a single sideband phone transmission versus full carrier amplitude modulation?
Available transmitter power can be used more effectively
Which of the following is an advantage when using single sideband as compared to other analog voice modes on the HF amateur bands?
Less bandwidth used and greater power efficiency
Frequency Modulation (FM)
What is the name of the process that changes the instantaneous frequency of an RF wave to convey information?
Frequency modulation
Phase Modulation (PM)
What is the name of the process that changes the phase angle of an RF wave to convey information?
Phase modulation
Types of Information
CW
What is the purpose of an electronic keyer?
Automatic generation of strings of dots and dashes for CW operation
Which of the following describes full break-in telegraphy (QSK)?
Transmitting stations can receive between code characters and elements
What does the term "zero beat" mean in CW operation?
Which of the following describes Baudot code?
A 5-bit code with additional start and stop bits
Frequency-shift Keying
How is an FSK signal generated?
By changing an oscillator’s frequency directly with a digital control signal
How are the two separate frequencies of a Frequency Shift Keyed (FSK) signal identified?
Mark and Space
What is the most common frequency shift for RTTY emissions in the amateur HF bands?
170 Hz
What could be wrong if you cannot decode an RTTY or other FSK signal even though it is apparently tuned in properly?
All of these choices are correct
Data
What two devices in an Amateur Radio station might be connected using a USB interface?
Computer and transceiver
Why is it important to know the duty cycle of the mode you are using when transmitting?
Some modes have high duty cycles which could exceed the transmitter's average power rating.
PACTOR
Which of the following is a way to establish contact with a digital messaging system gateway station?
Transmit a connect message on the station’s published frequency
What action results from a failure to exchange information due to excessive transmission attempts when using PACTOR or WINMOR?
The connection is dropped
How do you join a contact between two stations using the PACTOR protocol?
Joining an existing contact is not possible, PACTOR connections are limited to two stations
How can a PACTOR modem or controller be used to determine if the channel is in use by other PACTOR stations?
Put the modem or controller in a mode which allows monitoring communications without a connection
What symptoms may result from other signals interfering with a PACTOR or WINMOR transmission?
All of these choices are correct
How does the receiving station respond to an ARQ data mode packet containing errors?
It requests the packet be retransmitted
In the PACTOR protocol, what is meant by an NAK response to a transmitted packet?
The receiver is requesting the packet be retransmitted
What part of a data packet contains the routing and handling information?
PSK31
What does the number 31 represent in "PSK31"?
The approximate transmitted symbol rate
Which type of code is used for sending characters in a PSK31 signal?
Varicode
How many data bits are sent in a single PSK31 character?
The number varies
Which of the following statements is true about PSK31?
Upper case letters use longer Varicode signals and thus slow down transmission
Which of the following describes a waterfall display?
Frequency is horizontal, signal strength is intensity, time is vertical
Forward Error Correction
How does forward error correction (FEC) allow the receiver to correct errors in received data packets?
By transmitting redundant information with the data
Filters
What is the purpose of the "notch filter" found on many HF transceivers?
To reduce interference from carriers in the receiver passband
Bandwidth
Why is it good to match receiver bandwidth to the bandwidth of the operating mode?
It results in the best signal to noise ratio
When selecting a CW transmitting frequency, what minimum separation should be used to minimize interference to stations on adjacent frequencies?
150 to 500 Hz
What is the customary minimum frequency separation between SSB signals under normal conditions?
Approximately 3 kHz
What is the approximate bandwidth of a PACTOR3 signal at maximum data rate?
2300 Hz
Which of the following phone emissions uses the narrowest bandwidth?
Single sideband
Frequency Sharing Requirements
Which of the following applies when the FCC rules designate the Amateur Service as a secondary user on a band?
Amateur stations are allowed to use the band only if they do not cause harmful interference to primary users
What is the appropriate action if, when operating on either the 30-meter or 60-meter bands, a station in the primary service interferes with your contact?
Move to a clear frequency or stop transmitting
General Class Frequency Privileges
On which of the following bands is a General Class license holder granted all amateur frequency privileges?
160, 60, 30, 17, 12, and 10 meters
When General Class licensees are not permitted to use the entire voice portion of a particular band, which portion of the voice segment is generally available to them?
The upper frequency end
Which of the following frequencies is within the General Class portion of the 80-meter band?
3560 kHz
Which of the following frequencies is within the General Class portion of the 75-meter phone band?
3900 kHz
Which of the following frequencies is in the General Class portion of the 40-meter band?
7.250 MHz
On which of the following bands is phone operation prohibited?
30 meters
On which of the following bands is image transmission prohibited?
30 meters
Which of the following frequencies is within the General Class portion of the 20-meter phone band?
14305 kHz
Which of the following frequencies is within the General Class portion of the 15-meter band?
21300 kHz
Which of the following frequencies is available to a control operator holding a General Class license?
All of these choices are correct
When may a 10-meter repeater retransmit the 2-meter signal from a station having a Technician Class control operator?
Only if the 10-meter repeater control operator holds at least a General Class license
In what ITU region is operation in the 7.175 to 7.300 MHz band permitted for a control operator holding an FCC issued General Class license?
Region 2
60-meter band
Which of the following amateur bands is restricted to communication on only specific channels, rather than frequency ranges?
60 meters
Which of the following is required by the FCC rules when operating in the 60-meter band?
If you are using other than a dipole antenna, you must keep a record of the gain of your antenna
What is the maximum bandwidth permitted by FCC rules for Amateur Radio stations transmitting on USB frequencies in the 60-meter band?
2.8 kHz
Maximum Symbol Rate
What is the relationship between transmitted symbol rate and bandwidth?
Higher symbol rates require wider bandwidth
What is the maximum symbol rate permitted for RTTY or data emission transmission on the 20-meter band?
300 baud
What is the maximum symbol rate permitted for RTTY or data emission transmitted at frequencies below 28 MHz?
300 baud
What is the maximum symbol rate permitted for RTTY or data emission transmissions on the 10-meter band?
1200 baud
What is the maximum symbol rate permitted for RTTY or data emission transmissions on the 2-meter band?
19.6 kilobaud
What is the maximum symbol rate permitted for RTTY or data emission transmitted on the 1.25-meter and 70-centimeter bands?
56 kilobaud
Band Plan
Which of the following complies with good amateur practice when choosing a frequency on which to initiate a call?
Follow the voluntary band plan for the operating mode you intend to use
When choosing a transmitting frequency, what should you do to comply with good amateur practice?
All of these choices are correct
What is the "DX window" in a voluntary band plan?
A portion of the band that should not be used for contacts between stations within the 48 contiguous United States
What segment of the 20-meter band is most often used for digital transmissions?
14.070 - 14.100 MHz
In what segment of the 20-meter band are most PSK31 operations commonly found?
Below the RTTY segment, near 14.070 MHz
What segment of the 80-meter band is most commonly used for digital transmissions?
3570 - 3600 kHz
Weak-Signal Modes
Which of the following digital modes is designed to operate at extremely low signal strength on the HF bands?
JT9 and JT65
Upper versus Lower Sideband
Why do most amateur stations use lower sideband on the 160-meter, 75-meter and 40-meter bands?
Current amateur practice is to use lower sideband on these frequency bands
Which of the following modes is most commonly used for voice communications on the 160-meter, 75-meter, and 40-meter bands?
Lower sideband
Which sideband is most commonly used for voice communications on frequencies of 14 MHz or higher?
Upper sideband
Which mode is most commonly used for voice communications on the 17-meter and 12-meter bands?
Upper sideband
Which of the following is most commonly used for SSB voice communications in the VHF and UHF bands?
Upper sideband
Which mode is normally used when sending an RTTY signal via AFSK with an SSB transmitter?
LSB
What is the standard sideband used to generate a JT65 or JT9 digital signal when using AFSK in any amateur band?
USB
What is one advantage of selecting the opposite or "reverse" sideband when receiving CW signals on a typical HF transceiver?
It may be possible to reduce or eliminate interference from other signals
Edge-of-Band Operations
What frequency range is occupied by a 3 kHz USB signal with the displayed carrier frequency set to 14.347 MHz?
14.347 to 14.350 MHz
What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz?
7.175 to 7.178 MHz
How close to the lower edge of the 40-meter General Class phone segment should your displayed carrier frequency be when using 3 kHz wide LSB?
At least 3 kHz above the edge of the segment
How close to the upper edge of the 20-meter General Class band should your displayed carrier frequency be when using 3 kHz wide USB?
At least 3 kHz below the edge of the band
Automatically controlled digital station
Which of the following is the FCC term for an unattended digital station that transfers messages to and from the Internet?
Automatically controlled digital station
On what bands may automatically controlled stations transmitting RTTY or data emissions communicate with other automatically controlled digital stations?
Anywhere in the 1.25-meter or shorter wavelength bands, and in specified segments of the 80-meter through 2-meter bands
What is required to conduct communications with a digital station operating under automatic control outside the automatic control band segments?
The station initiating the contact must be under local or remote control
Capacitance
What is the value in microfarads of a 4700 nanofarad (nF) capacitor?
4.7 µF
What is the value in nanofarads (nF) of a 22,000 pF capacitor?
22 nF
What useful feature does a power supply bleeder resistor provide?
It ensures that the filter capacitors are discharged when power is removed
Which of the following is an advantage of ceramic capacitors as compared to other types of capacitors?
Comparatively low cost
Which of the following is an advantage of an electrolytic capacitor?
High capacitance for a given volume
Why is the polarity of applied voltages important for polarized capacitors?
All of these choices are correct
Inductor / Inductance
Which symbol in Figure G7-1 represents a tapped inductor?
Symbol 7
Which of the following is a reason not to use wire-wound resistors in an RF circuit?
The resistor's inductance could make circuit performance unpredictable
Inductors in Series and Parallel
Which of the following components should be added to an inductor to increase the inductance?
An inductor in series
What is the inductance of a 20 millihenry inductor connected in series with a 50 millihenry inductor?
70 millihenrys
What is the inductance of three 10 millihenry inductors connected in parallel?
3.3 millihenrys
Capacitors in Series and Parallel
Which of the following components should be added to a capacitor to increase the capacitance?
A capacitor in parallel
What is the equivalent capacitance of two 5.0 nanofarad capacitors and one 750 picofarad capacitor connected in parallel?
What is the capacitance of three 100 microfarad capacitors connected in series?
What is the capacitance of a 20 microfarad capacitor connected in series with a 50 microfarad capacitor?
Reactance
What is reactance?
Opposition to the flow of alternating current caused by capacitance or inductance
Which of the following causes opposition to the flow of alternating current in an inductor?
Reactance
Which of the following causes opposition to the flow of alternating current in a capacitor?
Reactance
What unit is used to measure reactance?
Ohm
How does a capacitor react to AC?
As the frequency of the applied AC increases, the reactance decreases
How does an inductor react to AC?
As the frequency of the applied AC increases, the reactance increases
Impedance
What is impedance?
The opposition to the flow of current in an AC circuit
What unit is used to measure impedance?
Ohm
Why is high input impedance desirable for a voltmeter?
Transformer
What causes a voltage to appear across the secondary winding of a transformer when an AC voltage source is connected across its primary winding?
Mutual inductance
Which symbol in Figure G7-1 represents a multiple-winding transformer?
Symbol 6
Why is the conductor of the primary winding of many voltage step up transformers larger in diameter than the conductor of the secondary winding?
To accommodate the higher current of the primary
Transformer Calculations
What is the RMS voltage across a 500-turn secondary winding in a transformer if the 2250-turn primary is connected to 120 VAC?
26.7 volts
What happens if you reverse the primary and secondary windings of a 4:1 voltage step down transformer?
The secondary voltage becomes 4 times the primary voltage
Toroidal Inductors
How should the winding axes of two solenoid inductors be oriented to minimize their mutual inductance?
At right angles to each other
What is an advantage of using a ferrite core toroidal inductor?
All of these choices are correct
Diode
What is the approximate junction threshold voltage of a conventional silicon diode?
0.7 volts
What is the approximate junction threshold voltage of a germanium diode?
0.3 volts
Light Emitting Diode
Which of the following is an advantage of an LED indicator compared to an incandescent indicator?
All of these choices are correct
How is an LED biased when emitting light?
Forward Biased
Zener Diode
Which symbol in figure G7-1 represents a Zener diode?
Symbol 5
Schottky Diode
Which of the following is an advantage of using a Schottky diode in an RF switching circuit rather than a standard silicon diode?
Lower capacitance
Half- and Full-Wave Rectifiers
What portion of the AC cycle is converted to DC by a half-wave rectifier?
180 degrees
What portion of the AC cycle is converted to DC by a full-wave rectifier?
360 degrees
What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?
A series of DC pulses at twice the frequency of the AC input
Transistor
Which symbol in figure G7-1 represents an NPN junction transistor?
Symbol 2
What are the stable operating points for a bipolar transistor used as a switch in a logic circuit?
Its saturation and cutoff regions
Field-Effect Transistor (FET)
Which symbol in figure G7-1 represents a field effect transistor?
Symbol 1
Why must the cases of some large power transistors be insulated from ground?
To avoid shorting the collector or drain voltage to ground
Metal Oxide Semiconductor Field-Effect Transistor (MOSFET)
Which of the following describes the construction of a MOSFET?
The gate is separated from the channel with a thin insulating layer
Vacuum Tubes
Which of the following solid state devices is most like a vacuum tube in its general operating characteristics?
A field effect transistor
Which element of a triode vacuum tube is used to regulate the flow of electrons between cathode and plate?
Control grid
What is the primary purpose of a screen grid in a vacuum tube?
To reduce grid-to-plate capacitance
TTL, CMOS, and BiCMOS
Which of the following is an advantage of CMOS integrated circuits compared to TTL integrated circuits?
Low power consumption
Monolithic Microwave Integrated Circuit (MMIC)
What is meant by the term MMIC?
Monolithic Microwave Integrated Circuit
Liquid-crystal display (LCD)
Which of the following is a characteristic of a liquid crystal display?
It requires ambient or back lighting
Oscillator
What are the basic components of virtually all sine wave oscillators?
A filter and an amplifier operating in a feedback loop
What determines the frequency of an LC oscillator?
The inductance and capacitance in the tank circuit
Direct Digital Synthesizer
Which of the following is an advantage of a transceiver controlled by a direct digital synthesizer (DDS)?
Variable frequency with the stability of a crystal oscillator
Various Connectors
Which of these connector types is commonly used for audio signals in Amateur Radio stations?
RCA Phono
Which of these connector types is commonly used for RF connections at frequencies up to 150 MHz?
PL-259
Which of the following describes a type N connector?
A moisture-resistant RF connector useful to 10 GHz
Which of the following connectors would be a good choice for a serial data port?
DE-9
What is the main reason to use keyed connectors instead of non-keyed types?
Reduced chance of incorrect mating
What is a type SMA connector?
A small threaded connector suitable for signals up to several GHz
What is the general description of a DIN type connector?
A family of multiple circuit connectors suitable for audio and control signals
Feed Line Losses
How does the attenuation of coaxial cable change as the frequency of the signal it is carrying increases?
Attenuation increases
In what units is RF feed line loss usually expressed?
Decibels per 100 feet
Impedance Matching
Why is impedance matching important?
So the source can deliver maximum power to the load
What happens when the impedance of an electrical load is equal to the output impedance of a power source, assuming both impedances are resistive?
The source can deliver maximum power to the load
Feed-Line Impedance
What are the typical characteristic impedances of coaxial cables used for antenna feed lines at amateur stations?
50 and 75 ohms
Which of the following factors determine the characteristic impedance of a parallel conductor antenna feed line?
The distance between the centers of the conductors and the radius of the conductors
What is the characteristic impedance of flat ribbon TV type twinlead?
300 ohms
What should be the impedance of a low-pass filter as compared to the impedance of the transmission line into which it is inserted?
Antenna Feed-Point Impedance
Which of the following is a common way to adjust the feed point impedance of a quarter wave ground plane vertical antenna to be approximately 50 ohms?
What happens to the feed point impedance of a ground plane antenna when its radials are changed from horizontal to sloping downward?
It increases
How does the feed point impedance of a 1/2 wave dipole antenna change as the antenna is lowered below 1/4 wave above ground?
How does the feed point impedance of a 1/2 wave dipole change as the feed point is moved from the center toward the ends?
Standing Wave Ratio (SWR)
What must be done to prevent standing waves on an antenna feed line?
The antenna feed point impedance must be matched to the characteristic impedance of the feed line
What standing wave ratio will result when connecting a 50 ohm feed line to a non-reactive load having 50 ohm impedance?
1:1
What standing wave ratio will result when connecting a 50 ohm feed line to a non-reactive load having 25 ohm impedance?
2:1
What standing wave ratio will result when connecting a 50 ohm feed line to a non-reactive load having 200 ohm impedance?
4:1
What standing wave ratio will result when connecting a 50 ohm feed line to a non-reactive load having 10 ohm impedance?
5:1
What standing wave ratio will result when connecting a 50 ohm feed line to an antenna that has a purely resistive 300 ohm feed point impedance?
6:1
What is the interaction between high standing wave ratio (SWR) and transmission line loss?
If a transmission line is lossy, high SWR will increase the loss
What is the effect of transmission line loss on SWR measured at the input to the line?
The higher the transmission line loss, the more the SWR will read artificially low
Antenna Analyzer
Which of the following must be connected to an antenna analyzer when it is being used for SWR measurements?
Antenna and feed line
What problem can occur when making measurements on an antenna system with an antenna analyzer?
Strong signals from nearby transmitters can affect the accuracy of measurements
What is a use for an antenna analyzer other than measuring the SWR of an antenna system?
Determining the impedance of an unknown or unmarked coaxial cable
Forward and Reflected Power
What might cause reflected power at the point where a feed line connects to an antenna?
A difference between feed line impedance and antenna feed point impedance
Which of the following can be determined with a directional wattmeter?
Standing wave ratio
Impedance Matching Systems
If the SWR on an antenna feed line is 5 to 1, and a matching network at the transmitter end of the feed line is adjusted to 1 to 1 SWR, what is the resulting SWR on the feed line?
5 to 1
Which of the following devices can be used for impedance matching at radio frequencies?
All of these choices are correct
Impedance Matching — Transformer
What is one reason to use an impedance matching transformer?
To maximize the transfer of power
What is the turns ratio of a transformer used to match an audio amplifier having 600 ohm output impedance to a speaker having 4 ohm impedance?
12.2 to 1
Impedance Matching — L-network
Which of the following describes one method of impedance matching between two AC circuits?
Insert an LC network between the two circuits
Impedance Matching — Gamma and Delta Matches
What is the purpose of a gamma match used with Yagi antennas?
To match the relatively low feed point impedance to 50 ohms
Which of the following is an advantage of using a gamma match for impedance matching of a Yagi antenna to 50 ohm coax feed line?
It does not require that the elements be insulated from the boom
Antenna Tuner
What type of device is often used to match transmitter output impedance to an impedance not equal to 50 ohms?
Antenna coupler or antenna tuner
Which of the following most limits the effectiveness of an HF mobile transceiver operating in the 75-meter band?
The antenna system
What is one disadvantage of using a shortened mobile antenna as opposed to a full size antenna?
Operating bandwidth may be very limited
What is the purpose of a capacitance hat on a mobile antenna?
To electrically lengthen a physically short antenna
What is the purpose of a corona ball on a HF mobile antenna?
To reduce high voltage discharge from the tip of the antenna
Power Supply - Advanced - Rectifier
What is the peak-inverse-voltage across the rectifier in a half-wave power supply?
Two times the normal peak output voltage of the power supply
What is the peak-inverse-voltage across the rectifiers in a full-wave bridge power supply?
Equal to the normal peak output voltage of the power supply
Power Supply Filters
Which of the following components are used in a power supply filter network?
Capacitors and inductors
Voltage Regulator
Linear voltage regulator
Switched versus Linear Power Supply
Which of the following is an advantage of a switchmode power supply as compared to a linear power supply?
High frequency operation allows the use of smaller components
Which of the following could be a cause of interference covering a wide range of frequencies?
Arcing at a poor electrical connection
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
Which of the following might be useful in reducing RF interference to audio frequency devices?
Bypass capacitor
What is the effect on an audio device or telephone system if there is interference from a nearby CW transmitter?
On-and-off humming or clicking
What sound is heard from an audio device or telephone if there is interference from a nearby single sideband phone transmitter?
Distorted speech
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
Which of the following would reduce RF interference caused by common-mode current on an audio cable?
Placing a ferrite choke around the cable
What is another term for the mixing of two RF signals?
Heterodyning
What is the simplest combination of stages that implement a superheterodyne receiver?
HF oscillator, mixer, detector
What circuit is used to process signals from the RF amplifier and local oscillator then send the result to the IF filter in a superheterodyne receiver?
Mixer
What receiver stage combines a 14.250 MHz input signal with a 13.795 MHz oscillator signal to produce a 455 kHz intermediate frequency (IF) signal?
Mixer
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
What circuit is used to combine signals from the IF amplifier and BFO and send the result to the AF amplifier in some single sideband receivers?
Product detector
FM Receiver - Limiter / Discriminator
What type of circuit is used in many FM receivers to convert signals coming from the IF amplifier to audio?
Discriminator
Digital Signal Processing
How is Digital Signal Processor filtering accomplished?
By converting the signal from analog to digital and using digital processing
Which of the following is needed for a Digital Signal Processor IF filter?
All of the these choices are correct
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 analog filter?
A wide range of filter bandwidths and shapes can be created
Which of the following can perform automatic notching of interfering carriers?
A Digital Signal Processor (DSP) filter
What is meant by the term "software defined radio" (SDR)?
A radio in which most major signal processing functions are performed by software
S-Meter
What does an S meter measure?
Where is an S meter found?
How much must the power output of a transmitter be raised to change the S meter reading on a distant receiver from S8 to S9?
Approximately 4 times
How does a signal that reads 20 dB over S9 compare to one that reads S9 on a receiver, assuming a properly calibrated S meter?
It is 100 times more powerful
Signal Reports
When sending CW, what does a "C" mean when added to the RST report?
Chirpy or unstable signal
Image Response
If a receiver mixes a 13.800 MHz VFO with a 14.255 MHz received signal to produce a 455 kHz intermediate frequency (IF) signal, what type of interference will a 13.345 MHz signal produce in the receiver?
Image response
Two-tone Test and Third-order Intercept Point
What type of transmitter performance does a two-tone test analyze?
Linearity
What signals are used to conduct a two-tone test?
Two non-harmonically related audio signals
Anatomy of a Single-Sideband (SSB) Transmitter
Which circuit is used to combine signals from the carrier oscillator and speech amplifier then send the result to the filter in some single sideband phone transmitters?
Balanced modulator
Which of the following is used to process signals from the balanced modulator then send them to the mixer in some single sideband phone transmitters?
Filter
Reactance Modulator / Phase Modulator
What emission is produced by a reactance modulator connected to a transmitter RF amplifier stage?
Phase modulation
Frequency Modulation Formulas
What is the total bandwidth of an FM phone transmission having 5 kHz deviation and 3 kHz modulating frequency?
16 kHz
FM Transmitter using an Upconverter
What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency?
Multiplier
What is the frequency deviation for a 12.21 MHz reactance modulated oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter?
416.7 Hz
Overmodulation
What is meant by the term flat-topping when referring to a single sideband phone transmission?
Signal distortion caused by excessive drive
Which of the following is an effect of overmodulation?
Excessive bandwidth
What is a reason to use Automatic Level Control (ALC) with an RF power amplifier?
To reduce distortion due to excessive drive
What control is typically adjusted for proper ALC setting on an amateur single sideband transceiver?
Transmit audio or microphone gain
What is likely to happen if a transceiver’s ALC system is not set properly when transmitting AFSK signals with the radio using single sideband mode?
Improper action of ALC distorts the signal and can cause spurious emissions
What is indicated on a waterfall display by one or more vertical lines adjacent to a PSK31 signal?
Overmodulation
Speech Processor / Speech Processing / Splatter Interference
What is the purpose of a speech processor as used in a modern transceiver?
Increase the intelligibility of transmitted phone signals during poor conditions
Which of the following can be the result of an incorrectly adjusted speech processor?
All of these choices are correct
Which of the following describes how a speech processor affects a transmitted single sideband phone signal?
It increases average power
Amplifier Classes
How is the efficiency of an RF power amplifier determined?
Divide the RF output power by the DC input power
Which of the following describes a linear amplifier?
An amplifier in which the output preserves the input waveform
Which of the following is a characteristic of a Class A amplifier?
Low distortion
Which of these classes of amplifiers has the highest efficiency?
Class C
For which of the following modes is a Class C power stage appropriate for amplifying a modulated signal?
CW
What condition can lead to permanent damage to a solid-state RF power amplifier?
Excessive drive power
Operational Amplifier (Op-Amp)
What kind of device is an integrated circuit operational amplifier?
Analog
Parasitic oscillations / Neutralizing an RF power amplifier
What is the reason for neutralizing the final amplifier stage of a transmitter?
To eliminate self-oscillations
Tuning Vacuum Tube Power Amplifier
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
What reading on the plate current meter of a vacuum tube RF power amplifier indicates correct adjustment of the plate tuning control?
A pronounced dip
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