Station Output Power
Bandwidth
FM Transmitter
AM Transmitter
CW Transmitter
SSB Transmitter
Basic Qualification Question Bank for Amateur Radio Operator Certificate Examinations 12 June, 2014

Transmitters

Station Output Power

(B)

B-001-017-001 What amount of transmitter power should radio amateurs use at all times?
A 2000 watts PEP output
B The minimum legal power necessary to communicate
C 25 watts PEP output
D 250 watts PEP output

(C)
B-001-017-002 What is the most FM transmitter power a holder of only Basic Qualification may use on 147 MHz?
A 200 watts PEP output
B 25 watts PEP output
C 250 W DC input
D 1000 watts DC input

(A)
B-001-017-003 Where in your station can you verify that legal power limits are respected?
A At the antenna connector of the transmitter or amplifier
B At the power amplifier RF input terminals inside the transmitter or amplifier
C On the antenna itself, after the transmission line
D At the power supply terminals inside the transmitter or amplifier

(B)
B-001-017-004 What is the maximum transmitting output power an amateur station may use on 3750 kHz, if the operator has Basic and Morse code qualifications?
A 2000 watts PEP output for SSB operation
B 560 watts PEP output for SSB operation
C 1000 watts PEP output for SSB operation
D 1500 watts PEP output for SSB operation

(A)
B-001-017-005 What is the maximum transmitting power an amateur station may use for SSB operation on 7055 kHz, if the operator has Basic with Honours qualifications?
A 560 watts PEP output
B 1000 watts PEP output
C 2000 watts PEP output
D 200 watts PEP output

(A)
B-001-017-006 The DC power input to the anode or collector circuit of the final RF stage of a transmitter, used by a holder of an Amateur Radio Operator Certificate with Advanced Qualification, shall not exceed:
A 1000 watts
B 250 watts
C 500 watts
D 750 watts

(B)
B-001-017-007 The maximum DC input to the final stage of an amateur transmitter, when the operator is the holder of both the Basic and Advanced qualifications, is:
A 500 watts
B 1000 watts
C 250 watts
D 1500 watts

(C)
B-001-017-008 The operator of an amateur station, who is the holder of a Basic Qualification, shall ensure that the station power, when expressed as RF output power measured across an impedance matched load, does not exceed:
A 1000 watts carrier power for transmitters producing other emissions
B 150 watts peak power
C 560 watts peak-envelope power, for transmitters producing any type of single sideband emission
D 2500 watts peak power

(C)
The holder of an Amateur Radio Operator Certificate with Basic Qualification is limited to a maximum of _______ watts when expressed as direct current input power to the anode or collector circuit of the transmitter stage supplying radio frequency energy to the antenna:
A 750
B 100
C 250
D 1000

(D)
B-001-017-010 Which of the following is the most powerful equipment the holder of a Basic with Honours certificate can legally operate at full power?
A 100 watts carrier power HF transmitter
B 200 watts carrier power HF transceiver
C 600 watts PEP HF linear amplifier
D 160 watts carrier power VHF amplifier

(A)
B-003-011-007 A mismatched antenna or transmission line may present an incorrect load to the transmitter. The result may be:
A full power will not be transferred to the antenna
B loss of modulation in the transmitted signal
C the driver stage will not deliver power to the final
D the output tank circuit breaks down

(D)
B-003-011-008 One result of a slight mismatch between the power amplifier of a transmitter and the antenna would be:
A smaller DC current drain
B lower modulation percentage
C radiated key-clicks
D reduced antenna radiation

(B)
B-003-011-010 The input power to the final stage of your transmitter is 200 watts and the output is 125 watts. What has happened to the remaining power?
A It has been used to provide positive feedback
B It has been dissipated as heat loss
C It has been used to provide greater efficiency
D It has been used to provide negative feedback

(A)
B-003-011-011 The difference between DC input power and RF output power of a transmitter RF amplifier:
A appears as heat dissipation
B is lost in the transmission line
C is due to oscillating
D radiates from the antenna

(B)
B-003-012-003 What is the term for the average power supplied to an antenna transmission line during one RF cycle, at the crest of the modulation envelope?
A Peak transmitter power
B Peak envelope power
C Peak output power
D Average radio-frequency power

(B)
B-003-012-006 What is one advantage of carrier suppression in a double-sideband phone transmission?
A Simpler equipment can be used to receive a double-sideband suppressed-carrier signal
B More power can be put into the sidebands for a given power amplifier capacity
C Only half the bandwidth is required for the same information content
D Greater modulation percentage is obtainable with lower distortion

Bandwidth

(B)

B-003-010-001 Which list of emission types is in order from the narrowest bandwidth to the widest bandwidth?
A RTTY, CW, SSB voice, FM voice
B CW, RTTY, SSB voice, FM voice
C CW, SSB voice, RTTY, FM voice
D CW, FM voice, RTTY, SSB voice

(C)
B-003-012-004 What is the usual bandwidth of a single-sideband amateur signal?
A 2 kHz
B Between 3 and 6 kHz
C Between 2 and 3 kHz
D 1 kHz

(A)
B-003-013-006 What is the usual bandwidth of a frequency-modulated amateur signal for +/- 5kHz deviation?
A Between 10 and 20 kHz
B Less than 5 kHz
C Between 5 and 10 kHz
D Greater than 20 kHz

(D)
B-003-013-009 Why isn't frequency modulated(FM) phone used below 28.0 MHz?
A The transmitter efficiency for this mode is low
B Harmonics could not be attenuated to practical levels
C The frequency stability would not be adequate
D The bandwidth would exceed limits in the Regulations

FM Transmitter

(B)

B-003-002-001 In a frequency modulation transmitter, the input to the speech amplifier is connected to the:
A frequency multiplier
B microphone
C modulator
D power amplifier

(A)
B-003-002-002 In a frequency modulation transmitter, the microphone is connected to the:
A speech amplifier
B modulator
C power amplifier
D oscillator

(B)
B-003-002-003 In a frequency modulation transmitter, the ____________is in between the speech amplifier and the oscillator.
A frequency multiplier
B modulator
C power amplifier
D microphone

(D)
B-003-002-004 In a frequency modulation transmitter, the __________is located between the modulator and the frequency multiplier.
A speech amplifier
B power amplifier
C microphone
D oscillator

(B)
B-003-002-005 In a frequency modulation transmitter, the ___________is located between the oscillator and the power amplifier.
A modulator
B frequency multiplier
C microphone
D speech amplifier

(D)
B-003-002-006 In a frequency modulation transmitter, the _________ is located between the frequency multiplier and the antenna.
A modulator
B speech amplifier
C oscillator
D power amplifier

(C)
B-003-002-007 In a frequency modulation transmitter, the power amplifier output is connected to the:
A microphone
B modulator
C antenna
D frequency multiplier

(A)
What kind of emission would your FM transmitter produce if its microphone failed to work?
A An unmodulated carrier
B A frequency-modulated carrier
C An amplitude-modulated carrier
D A phase-modulated carrier

(A)
Why is FM voice best for local VHF/UHF radio communications?
A It provides good signal plus noise to noise ratio at low RF signal levels
B The carrier is not detectable
C It is more resistant to distortion caused by reflected signals
D Its RF carrier stays on frequency better than the AM modes

(B)
B-003-013-007 What is the result of overdeviation in an FM transmitter?
A Poor carrier suppression
B Out-of-channel emissions
C Increased transmitter power
D Increased transmitter range

(A)
B-003-013-011 FM receivers perform in an unusual manner when two or more stations are present. The strongest signal, even though it is only two or three times stronger than the other signals, will be the only transmission demodulated. This is called:
A capture effect
B attach effect
C interference effect
D surrender effect

AM Transmitter

(D)

B-003-011-004 What type of modulation system changes the amplitude of an RF wave for the purpose of conveying information?
A Phase modulation
B Amplitude-rectification modulation
C Frequency modulation
D Amplitude modulation

(C)
B-003-011-005 In what emission type does the instantaneous amplitude(envelope) of the RF signal vary in accordance with the modulating audio?
A Pulse modulation
B Frequency shift keying
C Amplitude modulation
D Frequency modulation

CW Transmitter

(C)
B-003-004-001 In a CW transmitter, the output from the __________ is connected to the driver/buffer.
A telegraph key
B power supply
C master oscillator
D power amplifier

(B)
B-003-004-002 In a typical CW transmitter, the ___________ is the primary source of direct current.
A master oscillator
B power supply
C driver/buffer
D power amplifier

(B)
B-003-004-003 In a CW transmitter, the_________ is between the master oscillator and the power amplifier.
A telegraph key
B driver/buffer
C audio amplifier
D power supply

(B)
B-003-004-004 In a CW transmitter, the_____________ controls when RF energy is applied to the antenna.
A power amplifier
B telegraph key
C master oscillator
D driver/buffer

(A)
B-003-004-005 In a CW transmitter, the ______________ is in between the driver/buffer stage and the antenna.
A power amplifier
B power supply
C telegraph key
D master oscillator

(A)
B-003-004-006 In a CW transmitter, the output of the _____________ is transferred to the antenna.
A power amplifier
B driver/buffer
C power supply
D master oscillator

(D)
B-003-011-001 What does chirp mean?
A A high-pitched tone which is received along with a CW signal
B A slow change in transmitter frequency as the circuit warms up
C An overload in a receiver's audio circuit whenever CW is received
D A small change in a transmitter's frequency each time it is keyed

(B)
B-003-011-002 What can be done to keep a CW transmitter from chirping?
A Add a low pass filter
B Keep the power supply voltages very steady under transmit load
C Add a key-click filter
D Keep the power supply current very steady under transmit load

(C)
B-003-011-003 What circuit has a variable-frequency oscillator connected to a buffer/driver and a power amplifier?
A A single-sideband transmitter
B A digital radio transmitter
C A VFO-controlled CW transmitter
D A crystal-controlled AM transmitter

(C)
B-003-011-006 Morse code is usually transmitted by radio as:
A a continuous carrier
B a voice-modulated carrier
C an interrupted carrier
D a series of key-clicks

SSB Transmitter

(A)

B-003-006-001 In a single sideband transmitter, the output of the ________ is connected to the balanced modulator.
A radio frequency oscillator
B variable frequency oscillator
C linear amplifier
D mixer

(D)
B-003-006-002 In a single sideband transmitter, the output of the ____________ is connected to the filter.
A microphone
B mixer
C radio frequency oscillator
D balanced modulator

(B)
B-003-006-003 In a single sideband transmitter, the _____________ is in between the balanced modulator and the mixer.
A microphone
B filter
C radio frequency oscillator
D speech amplifier

(B)
B-003-006-004 In a single sideband transmitter, the ______________ is connected to the speech amplifier.
A mixer
B microphone
C radio frequency oscillator
D filter

(A)
B-003-006-005 In a single sideband transmitter, the output of the ___________ is connected to the balanced modulator.
A speech amplifier
B filter
C variable frequency oscillator
D linear amplifier

(B)
B-003-006-006 In a single sideband transmitter, the output of the variable frequency oscillator is connected to the __________.
A linear amplifier
B mixer
C antenna
D balanced modulator

(C)
B-003-006-007 In a single sideband transmitter, the output of the _________ is connected to the mixer.
A linear amplifier
B antenna
C variable frequency oscillator
D radio frequency oscillator

(B)
B-003-006-008 In an single sideband transmitter, the ____________ is in between the mixer and the antenna.
A radio frequency oscillator
B linear amplifier
C variable frequency oscillator
D balanced modulator

(B)
B-003-006-009 In a single sideband transmitter, the output of the linear amplifier is connected to the ______________.
A speech amplifier
B antenna
C filter
D variable frequency oscillator

(D)
B-003-010-004 Which of the following modes of transmission is usually detected with a product detector?
A Double sideband full carrier
B Frequency modulation
C Pulse modulation
D Single sideband suppressed carrier

(C)
B-003-012-005 In a typical single-sideband phone transmitter, what circuit processes signals from the balanced modulator and sends signals to the mixer?
A RF amplifier
B Carrier oscillator
C Filter
D IF amplifier

(B)
B-003-012-009 The purpose of a balanced modulator in an SSB transmitter is to:
A make sure that the carrier and both sidebands are in phase
B suppress the carrier and pass on the two sidebands
C make sure that the carrier and both sidebands are 180 degrees out of phase
D ensure that the percentage of modulation is kept constant

(D)
B-003-012-010 In a SSB transmission, the carrier is:
A transmitted with one sideband
B inserted at the transmitter
C of no use at the receiver
D reinserted at the receiver

(A)
B-003-012-011 The automatic level control(ALC) in a SSB transmitter:
A controls the peak audio input so that the power amplifier is not overdriven
B reduces transmitter audio feedback
C increases the occupied bandwidth
D reduces the system noise

(D)
B-003-014-006 What is the reason for using a properly adjusted speech processor with a single-sideband phone transmitter?
A It reduces average transmitter power requirements
B It reduces unwanted noise pickup from the microphone
C It improves voice frequency fidelity
D It improves signal intelligibility at the receiver

(D)
B-003-014-007 If a single-sideband phone transmitter is 100% modulated, what will a speech processor do to the transmitter's power?
A It will increase the output PEP
B It will decrease the peak power output
C It will decrease the average power output
D It will add nothing to the output Peak Envelope Power(PEP)

(D)
B-003-014-008 When switching from receive to transmit:
A the transmit oscillator should be turned off
B the receiving antenna should be connected
C the power supply should be off
D the receiver should be muted

(A)
B-003-014-009 A switching system to enable the use of one antenna for a transmitter and receiver should also:
A disable the unit not being used
B ground the antenna on receive
C switch between meters
D disconnect the antenna tuner

(B)
B-003-014-010 An antenna changeover switch in a transmitter-receiver combination is necessary:
A to allow more than one transmitter to be used
B so that one antenna can be used for transmitter and receiver
C to change antennas for operation on other frequencies
D to prevent RF currents entering the receiver circuits
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November 20, 2017