Final Assessment — MOTORIZED ANTENNA TUNER — HF AND VHF/UHF

TM-GEAR-012 — Open Handout Course: TM-GEAR-012 Reference: TM-GEAR-012 handout Questions: 15 Passing score: 13/15 (87%). All calculation questions (Q6–Q9) must be correct. Time limit: 20 minutes Notes: Closed handout. No references during the assessment.

Questions

Q1. What is the operating principle of the MOTORIZED ANTENNA TUNER — HF AND VHF/UHF? State it in one sentence using technical terms.

Q2. 2-1 T-Network HF Tuner Explain the significance of this principle for RF performance.

Q3. What is the primary source of loss or degradation for the MOTORIZED ANTENNA TUNER — HF AND VHF/UHF as stated in Chapter 2? What installation or operating technique minimizes this effect?

Q4. Chapter 3 specifies particular component types for the MOTORIZED ANTENNA TUNER — HF AND VHF/UHF. Name two components where a wrong substitution would degrade RF performance and explain why.

Q5. What is the first step of the Chapter 4 assembly procedure? Why must assembly steps be performed in the specified order?

Q6. [Calculation] Using the formula from Appendix A (T-network with C1_max = C2_max = 365 pF, L_max = 28 μH:): Apply it to a realistic scenario with the MOTORIZED ANTENNA TUNER — HF AND VHF/UHF. Show all work and state the result with units.

Q7. [Calculation] Using the formula: At 14 MHz: matchable impedance range = ~5Ω to ~2000Ω Calculate a result for a specific installation scenario. Show all work.

Q8. [Calculation] During a performance check of the MOTORIZED ANTENNA TUNER — HF AND VHF/UHF, you observe a reading of X. The specification (acceptance criterion) is Y. Compute the deviation in % and in appropriate units. (Use X = your measured value from the Unit 5 lab; Y = the acceptance criterion.)

Q9. [Calculation] The Chapter 5 operating procedure requires a specific numerical computation to evaluate the component's performance. State the formula and solve it for a given set of inputs. Show all work.

Q10. What does Chapter 5 specify as the correct action if the MOTORIZED ANTENNA TUNER — HF AND VHF/UHF produces an unexpected result during normal operation?

Q11. What is the acceptance criterion stated in Chapter 7 for the MOTORIZED ANTENNA TUNER — HF AND VHF/UHF? State it exactly: value, units, and condition.

Q12. What is the difference between the Chapter 6 calibration procedure and the Chapter 7 verification procedure? Which permits adjustments?

Q13. During Chapter 7 verification, one check fails. You make an adjustment and re-check. Is this acceptable? What is the correct action per the TM?

Q14. List four items required in a calibration log entry per Chapter 7.

Q15. After completing Chapter 7 verification, all checks pass. What conclusion can you draw about the MOTORIZED ANTENNA TUNER — HF AND VHF/UHF? What conclusion can you NOT draw?

— Turn page for answer key —

Answer Key

All answers directly verifiable from TM-GEAR-012.

A1. See TM §2-1. The answer is the first substantive statement of Chapter 2. TM ref: §2-1

A2. See TM §2-1. The significance is in the paragraph following the principle statement. TM ref: §2-1

A3. See Chapter 2. The loss or degradation source is identified by words like "dominant," "primary," or as the first-listed limitation. TM ref: Ch. 2

A4. See Chapter 3. Look for items where the TM specifies "non-inductive," a specific ferrite material, or a minimum tolerance — these are where substitutions matter most. TM ref: Ch. 3

A5. See Chapter 4, step 1. The reason for sequence is usually stated in the introductory paragraph of Chapter 4 or implied by the physical dependencies between steps. TM ref: Ch. 4, step 1

A6. Formula: T-network with C1_max = C2_max = 365 pF, L_max = 28 μH:. Any physically plausible input values give a correct answer if the computation is done correctly. TM ref: App. A

A7. Formula: At 14 MHz: matchable impedance range = ~5Ω to ~2000Ω. Show substitution, arithmetic, and result with units. TM ref: App. A

A8. Deviation (%) = (measured − specification) / specification × 100. Deviation (units) = measured − specification. TM ref: App. A, Ch. 7

A9. See Chapter 5. The formula and its application are in Chapter 5 or Appendix A. TM ref: Ch. 5, App. A

A10. See Chapter 5. The correct action for an unexpected result is always: stop, diagnose the cause, do not proceed until the discrepancy is explained. TM ref: Ch. 5

A11. Criterion: within 60 seconds on any HF band. Check your wording against the TM — units and numeric value must match exactly. TM ref: Ch. 7

A12. Calibration (Ch. 6) allows adjustments to bring the component within specification. Verification (Ch. 7) confirms the result and allows no adjustments. Calibration permits adjustments; verification does not. TM ref: Ch. 6, Ch. 7

A13. No — making an adjustment during verification invalidates the verification. Correct action: stop verification, return to Chapter 6 calibration, then repeat the full Chapter 7 verification from the beginning. TM ref: Ch. 7

A14. See Chapter 7, final steps. Typical items: date, equipment used, measured values, acceptance criteria, pass/fail determination, operator name. TM ref: Ch. 7

A15. You CAN conclude: the component is performing within its specified parameters at this time and under these conditions. You CANNOT conclude: it will remain in spec indefinitely, or that it was in spec before this verification. TM ref: Ch. 7

Score Routing

Question → Unit map: Q1–Q3 → Unit 1 (Theory); Q4–Q5 → Units 2–3 (Construction/Assembly); Q6–Q9 → Unit 4 (Calculations); Q10 → Unit 4; Q11–Q15 → Unit 5 (Calibration/Verification).