Question 2

• AIM: To test the knowledge of candidates on fault finding in a radio receiver.

  1. You are provided with a multichannel radio receiver.
  2.   Connect the radio receiver to the power source.
  3. Copy Table 2 into your answer booklet.

   

  Table 2

  Conditions for tests	Observation
  	Stations Received	Frequency	Signal strength
  with the antenna connected	1 2 3
  with the antenna disconnected	1 2 3

   

  1. Switch ON the radio set.
  2. Set the radio receiver to FM band.
  3. Tune the radio set to any station in your locality and mark it station 1.
  4. Note the frequency of the tuned station and record the value in Table 2.
  5. Search for two other stations by tuning the radio across the band and mark stations 2 and 3.
  6. Observe and record in Table 2, the signal quality of each station recorded in terms of sensitivity, selectivity and fidelity.
  7. The supervisor should monitor the activities in steps (k) to (n).
  8. Switch OFF the radio set and unplug it from the mains.
  9. Open the back cover of the set.
  10. Disconnect the antenna connecting wire.
  11. Re-plug the set and switch it ON.
  12. Repeat steps (e) to (i).
  13. Switch OFF the radio and unplug it.
  14. Compare and comment on the results obtained in Table 2 for steps (i) and (o).
  15. Identify and state three components on the circuit board.
  16. State the stages of each identified component in (r).
  17. The supervisor should reconnect the antenna.
  18. State two precautions taken when carrying out the activities listed above.