Transmitters

B

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

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

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

D

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

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

A

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

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

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

B

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

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

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

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 t

B

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

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

B

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

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

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

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

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 stay

B

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

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

D

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

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

C

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

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

n 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

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

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

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

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 f

B

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

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

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

A

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

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

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

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

A

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

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

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

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

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

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

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

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

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

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

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

D

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 noth

D

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

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

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 pr

A

An RF oscillator should be electrically and mechanically stable. This is to ensure that the oscillator does not:
A.
drift in frequency
B.
become over modulated
C.
generate key-clicks
D.
cause undue distortion

B

What may happen if an SSB transmitter is operated with the microphone gain set too high?
A.
It may cause digital interference to computer equipment
B.
It may cause splatter interference to other stations operating near its frequency
C.
It may cause interf

D

What may happen if an SSB transmitter is operated with too much speech processing?
A.
It may cause digital interference to computer equipment
B.
It may cause atmospheric interference in the air around the antenna
C.
It may cause interference to other stat

A

What happens to the signal of an overmodulated single-sideband or double-sideband phone transmitter?
A.
It becomes distorted and occupies more bandwidth
B.
It becomes stronger with no other effects
C.
It occupies less bandwidth with poor high-frequency re

B

How should the microphone gain control be adjusted on a single-sideband phone transmitter?
A.
For a dip in plate current
B.
For slight movement of the ALC meter on modulation peaks
C.
For full deflection of the ALC meter on modulation peaks
D.
For 100% fr

A

What may happen if an FM transmitter is operated with the microphone gain or deviation control set too high?
A.
It may cause interference to other stations operating near its frequency
B.
It may cause digital interference to computer equipment
C.
It may c

B

What may your FM hand-held or mobile transceiver do if you shout into its microphone and the deviation adjustment is set too high?
A.
It may cause interference to other stations operating on a higher frequency band
B.
It may cause interference to other st

A

What can you do if you are told your FM hand-held or mobile transceiver is overdeviating?
A.
Talk farther away from the microphone
B.
Talk louder into the microphone
C.
Let the transceiver cool off
D.
Change to a higher power level

B

What emission is produced by a reactance modulator connected to an RF power amplifier?
A.
Pulse modulation
B.
Phase modulation
C.
Multiplex modulation
D.
Amplitude modulation

D

You are transmitting FM on the 2 metre band. Several stations advise you that your transmission is loud and distorted. A quick check with a frequency counter tells you that the transmitter is on the proper frequency. Which of the following is the most pro