The 8.1.5 Transmitters and Neutralization exam is an in-depth assessment focusing on the critical aspects of radio transmission technology. Candidates will be tested on their knowledge of RF power amplifiers and the intricacies of transmitter neutralization to ensure stable and efficient signal transmission. The exam delves into amplitude modulation (AM) techniques, single sideband operations, and the importance of linearity, alongside practical two-tone tests. Further, it evaluates understanding of frequency modulation (FM), including deviation, modulation index, and the use of deviation meters.

Participants will also be challenged on their comprehension of FM transmitter and repeater circuit designs, essential for extending communication ranges. Signal processing, covering audio frequency (AF), intermediate frequency (IF), and radio frequency (RF) stages, is another critical component, ensuring candidates are well-versed in the modification and enhancement of signals. Moreover, the exam includes codes and protocols such as Baudot, ASCII, and various error detection and correction methods, pivotal for digital communication. Lastly, it covers spread spectrum technologies, including frequency hopping and direct sequences, highlighting their role in secure and reliable wireless communication.

The exam offers a comprehensive evaluation of your knowledge in transmitters, RF amplification, modulation techniques, and signal processing, alongside critical communication protocols and spread spectrum technologies. It’s designed for those aiming to excel in advanced amateur radio operations, covering everything from the basics of AM and FM, circuit neutralization, to the complexities of digital communication standards and security in wireless networks.

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8.1.5 Transmitters, Neutralisations Exam

Advanced Amateur Radio – Transmitters, Neutralisations Exam

Prepare to test your expertise in advanced transmission systems with the 8.1.5 Transmitters and Neutralization exam. This assessment covers a broad spectrum of topics, from RF power amplifiers and the technicalities of modulation to the critical aspects of signal processing and digital communication protocols. It’s designed to test your comprehensive understanding and practical skills in modern radio transmission techniques and technologies, essential for any advanced amateur radio operator.

 

 

1 / 25

Category: FM deviation, modulation index, deviation ratio, deviation meters

A-005-005-008: Some types of deviation meters work on the principle of:

2 / 25

Category: FM transmitter, repeater circuits

A-005-006-007: Which type of filter would be best to use in a 2-metre repeater duplexer?

3 / 25

Category: RF power amplifiers

A-005-002-005: 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:

4 / 25

Category: FM deviation, modulation index, deviation ratio, deviation meters

A-005-005-005: When the transmitter is not modulated, or the amplitude of the modulating signal is zero, the frequency of the carrier is called its:

5 / 25

Category: Codes and protocols, Baudot, ASCII, parity, CRC, X.25, ISO layers

A-005-008-001: What digital code consists of elements having unequal length?

6 / 25

Category: Oscillator circuits, phase-locked loop (PLL)s

A-005-001-004: Why is the Colpitts oscillator circuit commonly used in a VFO?

7 / 25

Category: FM transmitter, repeater circuits

A-005-006-011: Intermodulation interference products are not typically associated with which of the following:

8 / 25

Category: FM deviation, modulation index, deviation ratio, deviation meters

A-005-005-011: What is the frequency deviation for a 12.21-MHz reactance-modulated oscillator in a +/- 5-kHz deviation, 146.52-MHz FM-phone transmitter?

9 / 25

Category: Signal processing – AF, IF, and RFs

A-005-007-009: What is the undesirable result of AF clipping in a speech processor?

10 / 25

Category: Signal processing – AF, IF, and RFs

A-005-007-011: Automatic Level Control (ALC) is another name for:

11 / 25

Category: AM, single sideband, linearity, two-tone tests

A-005-004-009: What measurement can be made of a single-sideband phone transmitter’s amplifier by performing a two-tone test using an oscilloscope?

12 / 25

Category: Transmitters, neutralisations

A-005-003-003: In a simple 2 stage CW transmitter, the transistor in the second stage would act as:

13 / 25

Category: FM deviation, modulation index, deviation ratio, deviation meters

A-005-005-003: 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?

14 / 25

Category: spread spectrum – frequency hopping, direct sequences

A-005-009-007: Why is it difficult to monitor a spread spectrum transmission?

15 / 25

Category: RF power amplifiers

A-005-002-007: 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:

16 / 25

Category: FM transmitter, repeater circuits

A-005-006-005: What type of circuit varies the tuning of an amplifier tank circuit to produce FM signals?

17 / 25

Category: Oscillator circuits, phase-locked loop (PLL)s

A-005-001-002: How is positive feedback coupled to the input in a Colpitts oscillator?

18 / 25

Category: spread spectrum – frequency hopping, direct sequences

A-005-009-006: Which type of signal is used to produce a predetermined alteration in the carrier for spread spectrum communication?

19 / 25

Category: FM transmitter, repeater circuits

A-005-006-008: The characteristic difference between a phase modulator and a frequency modulator is:

20 / 25

Category: Oscillator circuits, phase-locked loop (PLL)s

A-005-001-005: Why must a very stable reference oscillator be used as part of a phase-locked loop (PLL) frequency synthesizer?

21 / 25

Category: Oscillator circuits, phase-locked loop (PLL)s

A-005-001-010: An apparatus with an oscillator and a class C amplifier would be:

22 / 25

Category: Codes and protocols, Baudot, ASCII, parity, CRC, X.25, ISO layers

A-005-008-010: How many information bits are included in the Baudot code?

23 / 25

Category: Transmitters, neutralisations

A-005-003-007: What is the reason for neutralizing the final amplifier stage of a transmitter?

24 / 25

Category: AM, single sideband, linearity, two-tone tests

A-005-004-001: What type of signal does a balanced modulator produce?

25 / 25

Category: Oscillator circuits, phase-locked loop (PLL)s

A-005-001-006: Positive feedback from a capacitive divider indicates the oscillator type is:

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