Advanced Amateur A-005 Practice Exam 
Practice Exam for Section A-005 of the ISED Advanced Amateur Radio Examination.
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What error-correction system is used in AMTOR FEC (Mode B)? *
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In an FM transmitter system, the amount of deviation from the centre frequency is determined solely by the: *
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In an RF oscillator circuit designed for high stability, the positive feedback is drawn from two capacitors connected in series. These two capacitors would most likely be: *
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Open Systems Interconnection (OSI) model standardizes communications functions as layers within a data communications system.  Amateur digital radio systems often follow the OSI model in structure. What is the base layer of the OSI model involving the interconnection of a packet radio TNC to a computer terminal? *
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A circuit depending on positive feedback for its operation would be a: *
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What is the modulation index of an FM phone transmitter producing an instantaneous carrier deviation of 6 kHz when modulated with a 2 kHz modulating frequency? *
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Why must a very stable reference oscillator be used as part of a phase-locked loop (PLL) frequency synthesizer? *
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What measurement can be made of a single-sideband phone transmitter's amplifier by performing a two-tone test using an oscilloscope? *
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Which type of signal is used to produce a predetermined alteration in the carrier for spread spectrum communication? *
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How is positive feedback coupled to the input in a Colpitts oscillator? *
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What is the reason for neutralizing the final amplifier stage of a transmitter? *
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Why is it difficult to monitor a spread spectrum transmission? *
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How many information bits are included in the Baudot code? *
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Which description is not correct? You are planning to build a speech processor for your transceiver. Compared to AF clipping, RF clipping: *
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In a grounded grid amplifier using a triode vacuum tube, the input signal is applied to: *
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Which of the following is not a method used for peak limiting, in a signal processor? *
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After you have opened a VHF power amplifier to make internal tuning adjustments, what should you do before you turn the amplifier on? *
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What type of signal does a balanced modulator produce? *
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How can a single-sideband phone signal be produced? *
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What term describes a wide-band communications system in which the RF carrier varies according to some predetermined sequence? *
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What is one advantage of using ASCII rather than Baudot code? *
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Three important parameters to be verified in an FM transmitter are: *
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Automatic Level Control (ALC) is another name for: *
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The output tuning controls on a transmitter power amplifier with an adjustable PI network: *
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In a grounded grid amplifier using a triode vacuum tube, what would be the approximate B+ voltage required for an output of 400 watts at 400 mA with approximately 50 percent efficiency? *
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The characteristic difference between a phase modulator and a frequency modulator is: *
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How does intermodulation interference between two repeater transmitters usually occur? *
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What is the significant bandwidth of an FM-phone transmission having a +/- 5-kHz deviation and a 3-kHz modulating frequency? *
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Carrier suppression in a single-sideband transmitter takes place in: *
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Parasitic oscillations would tend to occur mostly in: *
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What is direct-sequence spread spectrum? *
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In a simple 2 stage CW transmitter, the transistor in the second stage would act as: *
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Some types of deviation meters work on the principle of: *
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What audio shaping network is added at an FM transmitter to attenuate the lower audio frequencies? *
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What is the deviation ratio of an FM phone transmitter having a maximum frequency swing of plus or minus 5 kHz and accepting a maximum modulation rate of 3 kHz? *
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How can intermodulation interference between two repeater transmitters in close proximity often be reduced or eliminated? *
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What type of circuit varies the tuning of an amplifier tank circuit to produce FM signals? *
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The purpose of using a centre-tap return connection on the secondary of transmitting tube's filament transformer is to: *
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In an oscillator where positive feedback is provided through a capacitor in series with a crystal, that type of oscillator is a: *
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What audio frequencies are used in a two-tone test of the linearity of a single-sideband phone transmitter? *
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In an oscillator circuit where positive feedback is obtained through a single capacitor in series with the crystal, the type of oscillator is: *
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Positive feedback from a capacitive divider indicates the oscillator type is: *
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What is the purpose of a Cyclic Redundancy Check (CRC)? *
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Any FM wave with single-tone modulation has: *
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How many information bits are included in the ISO-8859 extension to the ASCII code? *
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In most modern FM transmitters, to produce a better sound, a compressor and a clipper are placed: *
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What term is used to describe a spread spectrum communications system in which a very fast binary bit stream is used to shift the phase of an RF carrier? *
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What is the frequency deviation for a 12.21-MHz reactance-modulated oscillator in a +/- 5-kHz deviation, 146.52-MHz FM-phone transmitter? *
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When testing the amplitude linearity of a single-sideband transmitter what audio tones are fed into the microphone input and on what kind of kind of instrument is the output observed? *
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If a receiver tuned to 146.70 MHz receives an intermodulation product signal whenever a nearby transmitter transmits on 146.52, what are the two most likely frequencies for the other interfering signal? *
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What do you call the circuit which employs an analog to digital converter, a mathematical transform, a digital to analog converter and a low pass filter? *
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Maintaining the peak RF output of a SSB transmitter at a relatively constant level requires a circuit called the: *
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What is meant by "flat topping" in a single-sideband phone transmission? *
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What is the undesirable result of AF clipping in a speech processor? *
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Why are received spread-spectrum signals so resistant to interference? *
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As a power amplifier is tuned, what reading on its grid current meter indicates the best neutralization? *
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When the transmitter is not modulated, or the amplitude of the modulating signal is zero, the frequency of the carrier is called its: *
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How many bits are required to provide 256 discrete levels, or a ratio of 256:1? *
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An advantage of keying the buffer stage in a transmitter is that: *
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How is positive feedback coupled to the input in a Pierce oscillator? *
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What type of error control system is used in AMTOR ARQ (Mode A)? *
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Adding one bit to the word length, is equivalent to adding ____ dB to the dynamic range of the digitizer: *
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How is the positive feedback coupled to the input in a Hartley oscillator? *
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What digital code consists of elements having unequal length? *
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Which type of filter would be best to use in a 2-metre repeater duplexer? *
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The designator AX.25 is associated with which amateur radio mode? *
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APRS (Automatic Packet Reporting System) does NOT support which one of these functions? *
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Why is neutralization necessary for some vacuum-tube amplifiers? *
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What is frequency hopping spread spectrum? *
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Frequency hopping is used with which type of transmission? *
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Speech compression associated with SSB transmission implies: *
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In a grounded grid amplifier using a triode vacuum tube, the plate is connected to the pi-network through a: *
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Transmission with SSB, as compared to conventional AM transmission, results in: *
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Intermodulation interference products are not typically associated with which of the following: *
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What is the term used to describe a spread spectrum communications system where the centre frequency of a conventional carrier is changed many times per second in accordance with a pseudorandom list of channels? *
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Which principle is not associated with analog signal processing? *
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An apparatus with an oscillator and a class C amplifier would be: *
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In a simple 2 stage CW transmitter, current to the collector of the transistor in the class C amplifier stage flows through a radio frequency choke (RFC) and a tapped inductor. The RFC, on the tapped inductor side, is also connected to grounded capacitors. The purpose of the RFC and capacitors is to: *
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The peak power output of a single-sideband transmitter, when being tested by a two-tone generator is: *
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Harmonics produced in an early stage of a transmitter may be reduced in a later stage by: *
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In an FM phone signal having a maximum frequency deviation of 3000 Hz either side of the carrier frequency, what is the modulation index, when the modulating frequency is 1000 Hz? *
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If the signals of two repeater transmitters mix together in one or both of their final amplifiers and unwanted signals at the sum and difference frequencies of the original signals are generated and radiated, what is this called? *
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What kind of input signal is used to test the amplitude linearity of a single-sideband phone transmitter while viewing the output on an oscilloscope? *
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In a grounded grid amplifier using a triode vacuum tube, each side of the filament is connected to a capacitor whose other end is connected to ground. These are: *
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Which of the following functions is not included in a typical digital signal processor? *
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In a grounded grid amplifier using a triode vacuum tube, the secondary winding of a transformer is connected directly to the vacuum tube. This transformer provides: *
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Parasitic oscillations are usually generated due to: *
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In a simple 2 stage CW transmitter circuit, the oscillator stage and the class C amplifier stage are inductively coupled by a RF transformer. Another role of the RF transformer is to: *
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In a grounded grid amplifier using a triode vacuum tube, the cathode is connected to a radio frequency choke. The other end of the radio frequency choke connects to the: *
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What does a neutralizing circuit do in an RF amplifier? *
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Why is the Colpitts oscillator circuit commonly used in a VFO? *
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How much is the carrier suppressed below peak output power in a single-sideband phone transmission? *
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How does the spread-spectrum technique of frequency hopping work? *
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Parasitic oscillations in an RF power amplifier may be caused by: *
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Which algorithm may be used to create a Cyclic Redundancy Check (CRC)? *
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What is the deviation ratio of an FM phone transmitter having a maximum frequency swing of plus or minus 7.5 kHz and accepting a maximum modulation rate of 3.5 kHz? *
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In a grounded grid amplifier using a triode vacuum tube, the plate is connected to a radio frequency choke. The other end of the radio frequency choke connects to the: *
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Direct sequence is used with which type of transmission? *
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When using some deviation meters, it is important to know: *
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