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: Oscillators, mixers, tunings

A-006-002-002: A superheterodyne receiver designed for SSB reception must have a beat-frequency oscillator (BFO) because:

2 / 25

Category: Detection, audio, automatic gain controls

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

3 / 25

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

A-006-005-010: Poor dynamic range of a receiver can cause many problems when a strong signal appears within or near the front-end bandpass. Which of the following is NOT caused as a direct result?

4 / 25

Category: RF, IF amplifiers, selectivity

A-006-003-005: How is receiver sensitivity often expressed for UHF FM receivers?

5 / 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:

6 / 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?

7 / 25

Category: RF, IF amplifiers, selectivity

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

8 / 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:

9 / 25

Category: RF, IF amplifiers, selectivity

A-006-003-011: Normally, front-end selectivity is provided by the resonant networks both before and after the RF stage in a superheterodyne receiver. This whole section of the receiver is often referred to as the:

10 / 25

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

A-006-005-006: Which of the following is an important reason for using a VHF intermediate frequency in an HF receiver?

11 / 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?

12 / 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?

13 / 25

Category: Oscillators, mixers, tunings

A-006-002-007: In a superheterodyne receiver, a stage before the IF amplifier has a variable capacitor in parallel with a trimmer capacitor and an inductance. The variable capacitor is for:

14 / 25

Category: RF, IF amplifiers, selectivity

A-006-003-003: How much gain should be used in the RF amplifier stage of a receiver?

15 / 25

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

A-006-005-003: What causes receiver desensitization?

16 / 25

Category: Detection, audio, automatic gain controls

A-006-004-006: The low-level output of a detector is:

17 / 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?

18 / 25

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?

19 / 25

Category: Single, double-conversion superheterodyne architectures

A-006-001-002: What factors should be considered when selecting an intermediate frequency?

20 / 25

Category: Detection, audio, automatic gain controls

A-006-004-005: The amplified IF signal is applied to the ____________ stage in a superheterodyne receiver:

21 / 25

Category: RF, IF amplifiers, selectivity

A-006-003-008: The noise generated in a receiver of good design originates in the:

22 / 25

Category: Oscillators, mixers, tunings

A-006-002-004: If the incoming signal to the mixer is 3 600 kHz and the first IF is 9 MHz, at which one of the following frequencies would the local oscillator (LO) operate?

23 / 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?

24 / 25

Category: RF, IF amplifiers, selectivity

A-006-003-010: The term which relates specifically to the amplitude levels of multiple signals that can be accommodated during reception is called:

25 / 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?

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