UUS Practice Tests⌕ Search
Radio Operator Licensing · Written Element 9

FCC Written Element 9 Examination — GMDSS Radio Maintenance Practices and Procedures Practice Test

The FCC Written Element 9 Examination concerns maintenance practices and procedures for Global Maritime Distress and Safety System (GMDSS) radio equipment. Its practice questions address hands-on troubleshooting, electrical and RF measurements, cable and connector work, equipment mounting, grounding, and safe handling of components that are not intended for field service.

Exam overview

Exam providerFederal Communications Commission
Exam codeWritten Element 9
CategoryRadio Operator Licensing

About the FCC Written Element 9 Examination — GMDSS Radio Maintenance Practi… Exam

Maintenance work requires choosing measurements that reveal the fault without exposing the technician or equipment to unnecessary risk. Practice topics include checking an oscillator output with a frequency-measuring instrument, diagnosing power-wiring voltage drop under load, and testing bonding with equipment isolated as required. Other scenarios focus on restoring a seated control-panel connection, matching antenna feed-line characteristics, securing mounts, and selecting replacement indicators in accordance with equipment instructions. Questions also call for recognizing when a sealed, pressurized, non-serviceable component must be referred for appropriate service rather than opened. These decisions draw on interpreting service documentation, distinguishing RF, audio, and power circuits, and applying instrument ratings suitable for the measurement environment.

Sample Practice Questions

Review a selection from this exam's published US Practice Tests practice bank.

Question 1

A technician wants to determine whether a radio's receiver is intermittently losing its local oscillator signal. Which instrument is most directly suited to checking the frequency of an accessible oscillator output?

  1. AFrequency counter
  2. BClamp ammeter
  3. CInsulation resistance tester
  4. DSound-level meter
Show answerCorrect answer: A

A frequency counter measures the frequency of a suitable electrical signal. The signal level and waveform must be compatible with the instrument, and probing should not disturb the circuit or exceed ratings.

Question 2

A technician notices that a radio’s removable control-panel cable is not fully seated. What is the best way to restore the connection?

  1. APull the cable by its wires until it clicks into place
  2. BDe-energize the equipment as instructed, inspect the connector, and seat it using the connector body and proper latch
  3. CForce the connector in at an angle
  4. DAdd conductive grease to the contacts without checking the product instructions
Show answerCorrect answer: B

A connector should be inspected for alignment or damage and seated by its body, using its designed latch. De-energizing as directed and avoiding force helps prevent bent contacts, broken latches, and electrical damage.

Question 3

Why is it important to use a test instrument with an adequate measurement category and voltage rating when checking a vessel's electrical system?

  1. ATo reduce the risk of instrument failure or electric shock from transient or excessive voltage
  2. BTo make the instrument display more decimal places
  3. CTo prevent the radio from receiving weak signals
  4. DTo ensure the circuit's fuse will not open
Show answerCorrect answer: A

An instrument with appropriate safety ratings is designed for the electrical environment in which it is used. A rating that is inadequate for the voltage or transients can create hazards for both the technician and the equipment.

Question 4

Why should a technician avoid routing a radio's RF feed line tightly alongside sensitive low-level audio wiring for a long distance?

  1. AIt can increase unwanted RF coupling and interference in the audio circuit
  2. BIt makes the audio wiring carry less DC current
  3. CIt changes the transmitter's assigned frequency
  4. DIt prevents the receiver from tuning to its channel
Show answerCorrect answer: A

Close, extended parallel routing can couple RF energy into sensitive audio circuits, potentially producing interference or unwanted noise. Good installation practice separates susceptible wiring from RF paths where practical.

Question 5

During a scheduled inspection, a technician finds that a radio’s mounting fasteners have loosened. Why should the fasteners be restored to the specified condition?

  1. ATo maintain secure mounting and reduce stress on the equipment and its connections
  2. BTo make the radio’s receiver more sensitive
  3. CTo increase the transmitter’s rated output power
  4. DTo change the equipment’s operating frequency
Show answerCorrect answer: A

Secure mounting helps prevent movement, vibration damage, and strain on wiring or connectors. Fasteners should be tightened according to the manufacturer’s requirements rather than arbitrarily over-tightened.

Question 6

A technician must replace a radio's antenna feed-line cable. Which cable property is most important to match to the radio and antenna system?

  1. AThe cable's nominal characteristic impedance
  2. BThe cable's jacket color
  3. CThe cable's spool diameter
  4. DThe cable's printed length units
Show answerCorrect answer: A

The feed line should have the characteristic impedance specified for the radio and antenna system, commonly 50 ohms for many radio installations. An impedance mismatch can cause reflections and degrade power transfer.

Question 7

A radio’s service instructions call for a particular replacement lamp or indicator. Which replacement choice is appropriate?

  1. AA part with matching appearance, regardless of electrical rating
  2. BA part that meets the specified electrical and mechanical requirements
  3. CThe highest-wattage lamp that fits the opening
  4. DA lamp intended for a different voltage, provided it lights briefly
Show answerCorrect answer: B

Replacement parts should meet specified electrical and mechanical requirements. A part that merely fits may operate incorrectly, overheat, or damage the equipment.

How to use this practice test

The free practice bank contains 50 published questions. A session presents up to 20 random questions, and results appear after the session. Use the questions to check how you select test instruments, isolate electrical faults, handle connections, and apply equipment service instructions.

Preparation tips

  • For frequency-measurement scenarios, identify the accessible oscillator output and choose an instrument suited to measuring its frequency.
  • Practice diagnosing power faults by comparing voltage-drop measurements under load with checks made on de-energized, isolated equipment.
  • Review coaxial feed-line characteristics and RF routing practices, including separation from sensitive low-level audio wiring.
  • Use equipment service instructions to guide connector seating, specified fasteners, and replacement lamps or indicators.
  • Distinguish field-serviceable parts from sealed, pressurized components labeled non-serviceable; do not treat visible damage as permission to open them.
Official sourceOfficial exam page ↗