The 8.1.7 Feedlines – Matching and Antenna Systems exam is meticulously designed to assess the comprehensive understanding essential for attaining the Spectrum Management Advanced Amateur Radio License. This exam delves into the nuanced application of antenna tuners and impedance matching circuits, fundamental for ensuring efficient energy transfer and optimized antenna performance in complex radio setups. By evaluating knowledge in these areas, the exam sets a foundation for advanced amateur radio operators to effectively manage and resolve the technical challenges associated with feedlines and antenna systems.

Furthermore, the examination explores the velocity factor and its critical role in feedline performance, alongside the theoretical and practical considerations of current and voltage distribution on antennas. These topics are vital for comprehending how different physical and electrical properties impact overall system functionality. Additionally, the exam addresses the significant effects that ground and elevation have on radiation patterns and angles, providing candidates with the insights needed to design and implement effective antenna systems tailored to specific environmental conditions.

This comprehensive evaluation is crucial for any amateur radio enthusiast seeking to elevate their technical expertise and achieve advanced licensing. It encourages a deeper investigation into the mechanics of antenna systems, pushing candidates to not only grasp theoretical concepts but also apply this knowledge in practical scenarios. Mastery of these subjects is indispensable for optimizing radio communication setups, ensuring candidates are well-prepared to tackle the challenges of advanced amateur radio operation and contribute to the amateur radio community with enhanced skill and confidence.

This exam is essential for advanced amateur radio operators aiming for the Spectrum Management Advanced Amateur Radio License, focusing on optimizing antenna systems through in-depth understanding of feedlines, impedance matching, and antenna design principles. It ensures candidates are well-prepared to address practical challenges in antenna setup and performance.

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Feedlines – Matching and Antenna Systems Exam

Advanced Amateur Radio – Feedlines – 8.1.7 Matching and Antenna Systems Exam

Tackle the key aspects of feedlines, matching, and antenna systems in this exam, crucial for advancing in amateur radio. It tests your ability to apply concepts like impedance matching and antenna feed arrangements effectively, preparing you for the Spectrum Management Advanced Amateur Radio License.

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Category: Current and voltage distribution on antennas

A-007-004-010: In a half-wave dipole, where does the minimum current occur?

2 / 25

Category: Current and voltage distribution on antennas

A-007-004-011: In a half-wave dipole, where does the minimum impedance occur?

3 / 25

Category: Velocity factor, the effect of line terminated in non-characteristic impedances

A-007-002-006: What is the term for the ratio of the actual velocity at which a signal travels through a transmission line to the speed of light in a vacuum?

4 / 25

Category: Ground and elevation effects, vertical radiation (take off) angles

A-007-007-006: How does antenna height affect the horizontal (azimuthal) radiation pattern of a horizontal dipole HF antenna?

5 / 25

Category: Current and voltage distribution on antennas

A-007-004-004: In a half-wave dipole, the lowest distribution of _________ occurs at the middle.

6 / 25

Category: Ground and elevation effects, vertical radiation (take off) angles

A-007-007-007: For long distance propagation, the vertical radiation angle of the energy from the antenna should be:

7 / 25

Category: Antenna tuner/transmatch, impedance matching circuits

A-007-001-001: For an antenna tuner of the “Transformer” type, which of the following statements is FALSE?

8 / 25

Category: Current and voltage distribution on antennas

A-007-004-005: In a half-wave dipole, the highest distribution of ________ occurs at the middle.

9 / 25

Category: Radiation resistance, antenna efficiency, beamwidths

A-007-008-011: If the ohmic resistance of a miniloop antenna is 2 milliohms and the radiation resistance is 50 milliohms, what is the antenna efficiency?

10 / 25

Category: Radiation resistance, antenna efficiency, beamwidths

A-007-008-001: What is meant by the radiation resistance of an antenna?

11 / 25

Category: Velocity factor, the effect of line terminated in non-characteristic impedances

A-007-002-007: What is a typical velocity factor for coaxial cable with polyethylene dielectric?

12 / 25

Category: Antenna tuner/transmatch, impedance matching circuits

A-007-001-002: For an antenna tuner of the “Series” type, which of the following statements is false?

13 / 25

Category: Antenna tuner/transmatch, impedance matching circuits

A-007-001-007: Why is an L-network of limited utility in impedance matching?

14 / 25

Category: Antenna tuner/transmatch, impedance matching circuits

A-007-001-009: What advantage does a pi-L network have over a pi-network for impedance matching between a vacuum tube linear amplifier and a multiband antenna?

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Category: Velocity factor, the effect of line terminated in non-characteristic impedances

A-007-002-008: What determines the velocity factor in a transmission line?

16 / 25

Category: Antenna feed arrangements – tee, gamma, stubs

A-007-003-008: A Yagi antenna uses a gamma match. The coaxial braid connects to:

17 / 25

Category: Radiation resistance, antenna efficiency, beamwidths

A-007-008-007: How is antenna percent efficiency calculated?

18 / 25

Category: Velocity factor, the effect of line terminated in non-characteristic impedances

A-007-002-001: What kind of impedance does a quarter wavelength transmission line present to the source when the line is shorted at the far end?

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Category: Polarization, helical beam, parabolic antennas

A-007-005-001: What is meant by circularly polarized electromagnetic waves?

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Category: Current and voltage distribution on antennas

A-007-004-008: The impedance of a half-wave antenna at its centre is low, because at this point:

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Category: Velocity factor, the effect of line terminated in non-characteristic impedances

A-007-002-005: What is the velocity factor of a transmission line?

22 / 25

Category: Radiation resistance, antenna efficiency, beamwidths

A-007-008-006: How can the approximate beamwidth of a beam antenna be determined?

23 / 25

Category: Ground and elevation effects, vertical radiation (take off) angles

A-007-007-009: The impedance at the centre of a dipole antenna more than 3 wavelengths above ground would be nearest to:

24 / 25

Category: Losses in real antenna systems, effective radiated powers

A-007-006-007: If the overall gain of an amateur station is increased by 3 dB the ERP (Effective Radiated Power) will:

25 / 25

Category: Polarization, helical beam, parabolic antennas

A-007-005-008: A helical-beam antenna with right-hand polarization will best receive signals with:

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