The Receivers exam is a detailed exploration of the technological principles that underpin the operation of modern radio receivers, designed for those seeking to deepen their understanding and proficiency in amateur radio as part of the Advanced Amateur radio certification. It covers a wide array of topics, starting with the architecture of single and double-conversion superheterodyne receivers, which are fundamental to achieving high-quality signal processing across various frequencies. The exam probes into oscillators and mixers, essential for frequency conversion and signal tuning, and examines the role of RF and IF amplifiers in enhancing signal selectivity and strength.

Furthermore, candidates will be tested on their knowledge of detection mechanisms for demodulating signals, the intricacies of audio processing, and the importance of automatic gain control in maintaining consistent output levels despite varying signal strengths. The exam also critically evaluates common performance limitations encountered in receiver design, including instability, image frequency interference, and spurious responses, challenging students to identify and mitigate these issues in practical scenarios.

The Receivers exam offers an in-depth assessment of your grasp on receiver technology, from the basics of superheterodyne architectures to advanced topics like selectivity, audio processing, and automatic gain control. It challenges you to understand and troubleshoot common performance issues, such as instability and spurious responses, preparing you for advanced amateur radio practice and design. This exam is an essential milestone for anyone looking to excel in the technical aspects of radio communication.

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Receivers Exam

Advanced Amateur Radio – Receivers Exam

Gear up for the Receivers exam, a crucial test of your knowledge on the operation and design of radio receivers. This exam covers essential topics like superheterodyne architectures, oscillator and mixer functions, amplification and selectivity, along with key performance considerations. It’s an opportunity to demonstrate your technical expertise and problem-solving skills in the realm of amateur radio receivers, a fundamental component of any radio communication system.

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Category: Performance limitations – instability, image, spurious, etc.s

A-006-005-011: Which of these measurements is a good indicator of VHF receiver performance in an environment of strong out-of-band signals?

2 / 25

Category: Detection, audio, automatic gain controls

A-006-004-010: Which two variables primarily determine the behaviour of an automatic gain control (AGC) loop?

3 / 25

Category: Single, double-conversion superheterodyne architectures

A-006-001-003: One of the greatest advantages of the double-conversion over the single-conversion receiver is that it:

4 / 25

Category: Oscillators, mixers, tunings

A-006-002-010: Which two stages in a superheterodyne receiver have input tuned circuits tuned to the same frequency?

5 / 25

Category: Oscillators, mixers, tunings

A-006-002-009: What receiver stage combines a 14.25-MHz input signal with a 13.795-MHz oscillator signal to produce a 455-kHz intermediate frequency (IF) signal?

6 / 25

Category: Single, double-conversion superheterodyne architectures

A-006-001-006: In a dual-conversion superheterodyne receiver what are the respective aims of the first and second conversion:

7 / 25

Category: Performance limitations – instability, image, spurious, etc.s

A-006-005-002: What is the term for the reduction in receiver sensitivity caused by a strong signal near the received frequency?

8 / 25

Category: Detection, audio, automatic gain controls

A-006-004-002: What does a product detector do?

9 / 25

Category: Performance limitations – instability, image, spurious, etc.s

A-006-005-004: What is one way receiver desensitization can be reduced?

10 / 25

Category: Performance limitations – instability, image, spurious, etc.s

A-006-005-001: What part of a superheterodyne receiver determines the image rejection ratio of the receiver?

11 / 25

Category: Detection, audio, automatic gain controls

A-006-004-007: The overall output of an AM/CW/SSB receiver can be adjusted by means of manual controls on the receiver or by use of a circuit known as:

12 / 25

Category: Detection, audio, automatic gain controls

A-006-004-008: AGC voltage is applied to the:

13 / 25

Category: Performance limitations – instability, image, spurious, etc.s

A-006-005-008: Which of the following is NOT a direct cause of instability in a receiver?

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Category: Detection, audio, automatic gain controls

A-006-004-011: What circuit combines signals from an IF amplifier stage and a beat-frequency oscillator (BFO), to produce an audio signal?

15 / 25

Category: Detection, audio, automatic gain controls

A-006-004-001: What audio shaping network is added at an FM receiver to restore proportionally attenuated lower audio frequencies?

16 / 25

Category: Single, double-conversion superheterodyne architectures

A-006-001-009: A single conversion receiver with a 9 MHz IF has a local oscillator operating at 16 MHz. The frequency it is tuned to is:

17 / 25

Category: Performance limitations – instability, image, spurious, etc.s

A-006-005-009: Poor frequency stability in a receiver usually originates in the:

18 / 25

Category: Detection, audio, automatic gain controls

A-006-004-009: AGC is derived in a receiver from one of two circuits. Depending on the method used, it is called:

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Category: Oscillators, mixers, tunings

A-006-002-008: In a superheterodyne receiver without an RF amplifier, the input to the mixer stage has a variable capacitor in parallel with an inductance. The variable capacitor is for:

20 / 25

Category: Single, double-conversion superheterodyne architectures

A-006-001-005: A multiple conversion superheterodyne receiver is more susceptible to spurious responses than a single-conversion receiver because of the:

21 / 25

Category: Single, double-conversion superheterodyne architectures

A-006-001-001: What are the advantages of the frequency conversion process in a superheterodyne receiver?

22 / 25

Category: RF, IF amplifiers, selectivity

A-006-003-001: What is meant by the noise floor of a receiver?

23 / 25

Category: Performance limitations – instability, image, spurious, etc.s

A-006-005-007: Intermodulation interference is produced by:

24 / 25

Category: RF, IF amplifiers, selectivity

A-006-003-002: Which of the following is a purpose of the first IF amplifier stage in a receiver?

25 / 25

Category: Single, double-conversion superheterodyne architectures

A-006-001-007: Which stage of a receiver has its input and output circuits tuned to the received frequency?

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