| 1 |
What is the purpose of the "notch filter" found on many HF transceivers?
|
|---|---|
| A | To restrict the transmitter voice bandwidth |
| B | To reduce interference from carriers in the receiver passband |
| C | To eliminate receiver interference from impulse noise sources |
| D | To enhance the reception of a specific frequency on a crowded band |
| 2 |
What is one advantage of selecting the opposite or "reverse" sideband when receiving CW signals on a typical HF transceiver?
|
|---|---|
| A | Interference from impulse noise will be eliminated |
| B | More stations can be accommodated within a given signal passband |
| C | It may be possible to reduce or eliminate interference from other signals |
| D | Accidental out of band operation can be prevented |
| 3 |
What is normally meant by operating a transceiver in "split" mode?
|
|---|---|
| A | The radio is operating at half power |
| B | The transceiver is operating from an external power source |
| C | The transceiver is set to different transmit and receive frequencies |
| D | The transmitter is emitting an SSB signal, as opposed to DSB operation |
| 4 |
What reading on the plate current meter of a vacuum tube RF power amplifier indicates correct adjustment of the plate tuning control?
|
|---|---|
| A | A pronounced peak |
| B | A pronounced dip |
| C | No change will be observed |
| D | A slow, rhythmic oscillation |
| 5 |
What is a reason to use Automatic Level Control (ALC) with an RF power amplifier?
|
|---|---|
| A | To balance the transmitter audio frequency response |
| B | To reduce harmonic radiation |
| C | To reduce distortion due to excessive drive |
| D | To increase overall efficiency |
| 6 |
What type of device is often used to match transmitter output impedance to an impedance not equal to 50 ohms?
|
|---|---|
| A | Balanced modulator |
| B | SWR Bridge |
| C | Antenna coupler or antenna tuner |
| D | Q-Multiplier |
| 7 |
What condition can lead to permanent damage to a solid-state RF power amplifier?
|
|---|---|
| A | Insufficient drive power |
| B | Low input SWR |
| C | Shorting the input signal to ground |
| D | Excessive drive power |
| 8 |
What is the correct adjustment for the load or coupling control of a vacuum tube RF power amplifier?
|
|---|---|
| A | Minimum SWR on the antenna |
| B | Minimum plate current without exceeding maximum allowable grid current |
| C | Highest plate voltage while minimising grid current |
| D | Maximum power output without exceeding maximum allowable plate current |
| 9 |
Why is a time delay sometimes included in a transmitter keying circuit?
|
|---|---|
| A | To prevent stations from interfering with one another |
| B | To allow the transmitter power regulators to charge properly |
| C | To allow time for transmit-receive changeover operations to complete properly before RF output is allowed |
| D | To allow time for a warning signal to be sent to other stations |
| 10 |
What is the purpose of an electronic keyer?
|
|---|---|
| A | Automatic transmit/receive switching |
| B | Automatic generation of strings of dots and dashes for CW operation |
| C | VOX operation |
| D | Computer interfaces for PSK and RTTY operation |
| 11 |
Which of the following is a use for the IF shift control on a receiver?
|
|---|---|
| A | To avoid interference from stations very close to the receive frequency |
| B | To change frequency rapidly |
| C | To permit listening on a different frequency from that on which you are transmitting |
| D | To tune in, stations that are slightly off frequency without changing transmitting frequency |
| 12 |
Which of the following is a common use for the dual VFO feature on a transceiver?
|
|---|---|
| A | To allow transmitting on two frequencies at once |
| B | To permit full duplex operation, that is transmitting and receiving at the same time |
| C | To permit monitoring of two different frequencies |
| D | To facilitate computer interface |
| 13 |
What is one reason to use the attenuator function that is present on many HF transceivers?
|
|---|---|
| A | To reduce signal overload due to strong incoming signals |
| B | To reduce the transmitter power when driving a linear amplifier |
| C | To reduce power consumption when operating from batteries |
| D | To slow down received CW signals for better copy |
| 14 |
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?
|
|---|---|
| A | ALC will invert the modulation of the AFSK mode |
| B | Improper action of ALC distorts the signal and can cause spurious emissions |
| C | When using digital modes, too much ALC activity can cause the transmitter to overheat |
| D | All of these choices are correct |
| 15 |
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?
|
|---|---|
| A | The VOX circuit does not unkey the transmitter |
| B | The transmitter signal is distorted |
| C | Frequent connection timeouts |
| D | All of these choices are correct |
| 16 |
What item of test equipment contains horizontal and vertical channel amplifiers?
|
|---|---|
| A | An ohmmeter |
| B | A signal generator |
| C | An ammeter |
| D | An oscilloscope |
| 17 |
Which of the following is an advantage of an oscilloscope versus a digital voltmeter?
|
|---|---|
| A | An oscilloscope applied less power consumption |
| B | Complex impedances can be easily measured |
| C | Input impedance is much lower |
| D | Complex waveforms can be measured |
| 18 |
Which of the following is the best instrument to use when checking the keying waveform of a CW transmitter?
|
|---|---|
| A | An oscilloscope |
| B | A field strength meter |
| C | A sidetone monitor |
| D | A wavemeter |
| 19 |
What signal source is connected to the vertical input of an oscilloscope when checking the RF envelope pattern of a transmitted signal?
|
|---|---|
| A | The local oscillator of the transmitter |
| B | An external RF oscillator |
| C | The transmitter balanced mixer output |
| D | The attenuated RF output of the transmitter |
| 20 |
Why is high input impedance desirable for a voltmeter?
|
|---|---|
| A | It improves the frequency response |
| B | It decreases battery consumption in the meter |
| C | It improves the resolution of the readings |
| D | It decreases the loading on circuits being measured |
| 21 |
What is an advantage of a digital voltmeter as compared to an analogue voltmeter?
|
|---|---|
| A | Better for measuring computer circuits |
| B | Better for RF measurements |
| C | Better precision for most uses |
| D | Faster response |
| 22 |
What signals are used to conduct a two-tone test?
|
|---|---|
| A | Two audio signals of the same frequency shifted 90 degrees |
| B | Two non-harmonically related audio signals |
| C | Two swept frequency tones |
| D | Two audio frequency range square wave signals of equal amplitude |
| 23 |
Which of the following instruments may be used to monitor relative RF output when making antenna and transmitter adjustments?
|
|---|---|
| A | A field strength meter |
| B | An antenna noises bridge |
| C | A multimeter |
| D | A Q meter |
| 24 |
Which of the following can be determined with a field strength meter?
|
|---|---|
| A | The radiation resistance of an antenna |
| B | The radiation pattern of an antenna |
| C | The presence and amount of phase distortion of a transmitter |
| D | The presence and amount of amplitude distortion of a transmitter |
| 25 |
Which of the following can be determined with a directional wattmeter?
|
|---|---|
| A | Standing wave ratio |
| B | Antenna front-to-back ratio |
| C | RF interference |
| D | Radio wave propagation |
| 26 |
Which of the following must be connected to an antenna analyser when it is being used for SWR measurements?
|
|---|---|
| A | Receiver |
| B | Transmitter |
| C | Antenna and feed line |
| D | All of these choices are correct |
| 27 |
What problem can occur when making measurements on an antenna system with an antenna analyser?
|
|---|---|
| A | Permanent damage to the analyser may occur if it is operated into a high SWR |
| B | Strong signals from nearby transmitters can affect the accuracy of measurements |
| C | The analyser can be damaged if measurements outside the ham bands are attempted |
| D | Connecting the analyser to an antenna can cause it to absorb harmonics |
| 28 |
What is a use for an antenna analyser other than measuring the SWR of an antenna system?
|
|---|---|
| A | Measuring the front to back ratio of an antenna |
| B | Measuring the turns ratio of a power transformer |
| C | Determining the impedance of an unknown or unmarked coaxial cable |
| D | Determining the gain of a directional antenna |
| 29 |
What is an instance in which the use of an instrument with analogue readout may be preferred over an instrument with a digital readout?
|
|---|---|
| A | When testing logic circuits |
| B | When high precision is desired |
| C | When measuring the frequency of an oscillator |
| D | When adjusting tuned circuits |
| 30 |
What type of transmitter performance does a two-tone test analyse?
|
|---|---|
| A | Linearity |
| B | Percentage of suppression of carrier and undesired sideband for SSB |
| C | Percentage of frequency modulation |
| D | Percentage of carrier phase shift |
| 31 |
Which of the following might be useful in reducing RF interference to audio frequency devices?
|
|---|---|
| A | Bypass inductor |
| B | Bypass capacitor |
| C | Forward-biased diode |
| D | Reverse-biased diode |
| 32 |
Which of the following could be a cause of interference covering a wide range of frequencies?
|
|---|---|
| A | Not using a balun or line isolator to feed balanced antennas |
| B | Lack of rectification of the transmitter's signal in power conductors |
| C | Arcing at a poor electrical connection |
| D | Using a balun to feed an unbalanced antenna |
| 33 |
What sound is heard from an audio device or telephone if there is interference from a nearby single-sideband phone transmitter?
|
|---|---|
| A | A steady hum whenever the transmitter is on the air |
| B | On-and-off humming or clicking |
| C | Distorted speech |
| D | Clearly audible speech |
| 34 |
What is the effect on an audio device or telephone system if there is interference from a nearby CW transmitter?
|
|---|---|
| A | On-and-off humming or clicking |
| B | A CW signal at a nearly pure audio frequency |
| C | A chirpy CW signal |
| D | Severely distorted audio |
| 35 |
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?
|
|---|---|
| A | Flat braid rather than round wire has been used for the ground wire |
| B | Insulated wire has been used for the ground wire |
| C | The ground rod is resonant |
| D | The ground wire has high impedance on that frequency |
| 36 |
What effect can be caused by a resonant ground connection?
|
|---|---|
| A | Overheating of ground straps |
| B | Corrosion of the ground rod |
| C | High RF voltages on the enclosures of station equipment |
| D | A ground loop |
| 37 |
What is one good way to avoid unwanted effects of stray RF energy in an amateur station?
|
|---|---|
| A | Connect all equipment grounds together |
| B | Install an RF filter in series with the ground wire |
| C | Use a ground loop for best conductivity |
| D | Install a few ferrite beads on the ground wire where it connects to your station |
| 38 |
Which of the following would reduce RF interference caused by the common-mode current on an audio cable?
|
|---|---|
| A | Placing a ferrite choke around the cable |
| B | Adding series capacitors to the conductors |
| C | Adding shunt inductors to the conductors |
| D | Adding an additional insulating jacket to the cable |
| 39 |
How can a ground loop be avoided?
|
|---|---|
| A | Connect all ground conductors in series |
| B | Connect the AC neutral conductor to the ground wire |
| C | Avoid using lock washers and star washers when making ground connections |
| D | Connect all ground conductors to a single point |
| 40 |
What could be a symptom of a ground loop somewhere in your station?
|
|---|---|
| A | You receive reports of "hum" on your station's transmitted signal |
| B | The SWR reading for one or more antennas is suddenly very high |
| C | An item of station equipment starts to draw excessive amounts of current |
| D | You receive reports of harmonic interference from your station |
| 41 |
Which of the following is a function of a digital signal processor?
|
|---|---|
| A | To provide adequate grounding |
| B | To remove noise from received signals |
| C | To increase antenna gain |
| D | To increase antenna bandwidth |
| 42 |
Which of the following is an advantage of a receiver DSP IF filter as compared to an analogue filter?
|
|---|---|
| A | A wide range of filter bandwidths and shapes can be created |
| B | Fewer digital components are required |
| C | Mixing products are greatly reduced |
| D | The DSP filter is much more effective at VHF frequencies |
| 43 |
Which of the following can perform automatic notching of interfering carriers?
|
|---|---|
| A | Bandpass tuning |
| B | A Digital Signal Processor (DSP) filter |
| C | Balanced mixing |
| D | A noise limiter |
| 44 |
What is the purpose of a speech processor as used in a modern transceiver?
|
|---|---|
| A | Increase the intelligibility of transmitted phone signals during poor conditions |
| B | Increase transmitter bass response for more natural sounding SSB signals |
| C | Prevent distortion of voice signals |
| D | Decrease high-frequency voice output to prevent out of band operation |
| 45 |
Which of the following describes how a speech processor affects a transmitted single-sideband phone signal?
|
|---|---|
| A | It increases peak power |
| B | It increases average power |
| C | It reduces harmonic distortion |
| D | It reduces intermodulation distortion |
| 46 |
Which of the following can be the result of an incorrectly adjusted speech processor?
|
|---|---|
| A | Distorted speech |
| B | Splatter |
| C | Excessive background pickup |
| D | All of these choices are correct |
| 47 |
What does an S meter measure?
|
|---|---|
| A | Conductance |
| B | Impedance |
| C | Received signal strength |
| D | Transmitter power output |
| 48 |
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?
|
|---|---|
| A | It is 10 times less powerful |
| B | It is 20 times less powerful |
| C | It is 20 times more powerful |
| D | It is 100 times more powerful |
| 49 |
Where is an S meter found?
|
|---|---|
| A | In a receiver |
| B | In an SWR bridge |
| C | In a transmitter |
| D | In a conductance bridge |
| 50 |
How much must the power output of a transmitter be raised to change the strength meter reading on a distant receiver from S8 to S9?
|
|---|---|
| A | Approximately 1.5 times |
| B | Approximately 2 times |
| C | Approximately 4 times |
| D | Approximately 8 times |
| 51 |
What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz?
|
|---|---|
| A | 7.178 to 7.181 MHz |
| B | 7.178 to 7.184 MHz |
| C | 7.175 to 7.178 MHz |
| D | 7.1765 to 7.1795 MHz |
| 52 |
What frequency range is occupied by a 3 kHz USB signal with the displayed carrier frequency set to 14.347 MHz?
|
|---|---|
| A | 14.347 to 14.647 MHz |
| B | 14.347 to 14.350 MHz |
| C | 14.344 to 14.347 MHz |
| D | 14.3455 to 14.3485 MHz |
| 53 |
How close to the lower edge of the 40-meter band should your displayed carrier frequency be when using 3 kHz wide LSB?
|
|---|---|
| A | At least 3 kHz above the edge of the band |
| B | At least 3 kHz below the edge of the band |
| C | Your displayed carrier frequency may be set at the edge of the band |
| D | At least 1 kHz above the edge of the band |
| 54 |
How close to the upper edge of the 20-meter band should your displayed carrier frequency be when using 3 kHz wide USB?
|
|---|---|
| A | At least 3 kHz above the edge of the band |
| B | At least 3 kHz below the edge of the band |
| C | Your displayed carrier frequency may be set at the edge of the band |
| D | At least 1 kHz below the edge of the segment |
| 55 |
What is the purpose of a capacitance hat on a mobile antenna?
|
|---|---|
| A | To increase the power handling capacity of a whip antenna |
| B | To allow automatic band changing |
| C | To allow remote tuning |
| D | To electrically lengthen a physically short antenna |
| 56 |
What is the purpose of a corona ball on an HF mobile antenna?
|
|---|---|
| A | To narrow the operating bandwidth of the antenna |
| B | To increase the "Q" of the antenna |
| C | To reduce the chance of damage if the antenna should strike an object |
| D | To reduce high voltage discharge from the tip of the antenna |
| 57 |
Which of the following direct, fused power connections would be the best for a 100 watt HF mobile installation?
|
|---|---|
| A | To the battery using heavy gauge wire |
| B | To the alternator or generator using heavy gauge wire |
| C | To the battery using resistor wire |
| D | To the alternator or generator using resistor wire |
| 58 |
Why is it best NOT to draw the DC power for a 100 watt HF transceiver from a vehicle’s auxiliary power socket?
|
|---|---|
| A | The socket is not wired with an RF-shielded power cable |
| B | The socket's wiring may be inadequate for the current drawn by the transceiver |
| C | The DC polarity of the socket is reversed from the polarity of modern HF transceivers |
| D | Drawing more than 50 watts from this socket could cause the engine to overheat |
| 59 |
Which of the following most limits the effectiveness of an HF mobile transceiver operating in the 80-meter band?
|
|---|---|
| A | "Picket Fencing" signal variation |
| B | The wire gauge of the DC power line to the transceiver |
| C | The antenna system |
| D | MCMC rules limiting mobile output power on the 80-meter band |
| 60 |
What is one disadvantage of using a shortened mobile antenna as opposed to a full-size antenna?
|
|---|---|
| A | Short antennas are more likely to cause distortion of transmitted signals |
| B | Short antennas can only receive circularly polarised signals |
| C | Operating bandwidth may be very limited |
| D | Harmonic radiation may increase |
| 61 |
Which of the following may cause interference to be heard in the receiver of an HF radio installed in a recent model vehicle?
|
|---|---|
| A | The battery charging system |
| B | The fuel delivery system |
| C | The vehicle controls computer |
| D | All of these choices are correct |
| 62 |
What is the name of the process by which sunlight is changed directly into electricity?
|
|---|---|
| A | Photovoltaic conversion |
| B | Photon emission |
| C | Photosynthesis |
| D | Photon decomposition |
| 63 |
What is the approximate open-circuit voltage from a fully illuminated silicon photovoltaic cell?
|
|---|---|
| A | 0.02 VDC |
| B | 0.5 VDC |
| C | 0.2 VDC |
| D | 1.38 VDC |
| 64 |
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?
|
|---|---|
| A | The diode serves to regulate the charging voltage to prevent overcharge |
| B | The diode prevents self-discharge of the battery though the panel during times of low or no illumination |
| C | The diode limits the current flowing from the panel to a safe value |
| D | The diode greatly increases the efficiency during times of high illumination |
| 65 |
Which of the following is a disadvantage of using the wind as the primary source of power for an emergency station?
|
|---|---|
| A | The conversion efficiency from mechanical energy to electrical energy is less than 2 percent |
| B | The voltage and current ratings of such systems are not compatible with amateur equipment |
| C | A large energy storage system is needed to supply power when the wind is not blowing |
| D | All of these choices are correct |