ELECTRONICS
Quarter 3 Module 2 Signal Transmission and
Reception of RADAR and LASER
Name:______________________________
Section:_____________________________
You are expected to:
• Describe the principles of signal transmission of radar and lasers
Explorative Activities:
Its Laser time!
Direction: Label the components of the laser transmitter and describe the three main component
Components:
1. Lasing Medium-_______________________________________________________________
2. Optical resonator-_____________________________________________________________
3. Stimulating energy source-______________________________________________________
Know your signal maker
Direction: Draw a simple block diagram of a RADAR and LASER transmission and reception
process on the boxes provided.
1. What components are found in the RADAR and LASER block diagrams that are similar to each
other? Explain the similarities between the components.
2. Which of the two block diagrams will have a faster response to the signal transmitted?
Explain.
Fill in the gaps
Direction: Complete the sentences by putting the correct word/s from the box.
1. A transmitter is a set of equipment used to generate and transmit electromagnetic waves
carrying messages or__________, especially those of radio or television.
2. Electromagnetic waves are usually holders of __________formed by the movement of
charged particles such as electrons.
3. Demodulation is the process of _____________the original information-bearing signal from a
carrier wave.
4. The receiver involves a ________________and detector that will capture and read the
incoming laser signal.
5. When the radio waves reach the receiving antenna, it induces _____ in it, which is very small
in magnitude and is fed to the radio receiver.
6. The transmitters can be classified into _________ and power amplifiers while the function of
the radar receiver is to accept weak target signals.
7. Receivers use _________________ to separate the desired radio frequency signal from all the
other signals picked up by the antenna.
8. A LASER is a device that emits light through a process of _______________________ based
on the stimulated emission of electromagnetic radiation.
9. A ___________________has more energy than a lower-frequency wave with the same
amplitude.
10. The extracted signal that is amplified by _________________and then fed to the speaker for
reproduction into sound waves.
ELECTRONICS
Quarter 3 Module 3 Radio Receiver Circuit
Name:______________________________
Section:_____________________________
You are expected to:
Describe the uses and characteristics of fundamental receiver sensor circuits
● Tuner
● Audio detector
● Audio amplifier
● Reproducer
Explorative Activities:
Activity 1
Directions: Study the illustration of a radio receiver block diagram below. Given the functions in
the second column of the table, identify the components in the first column.
Guide Questions:
1. What will happen if an antenna is not a part of the radio receiver circuit?
2. What is the effect of the RF amplifier if it is not a part of the circuit?
3. What do you think is the most important part of the radio receiver circuit?
Explain your answer.
Assessment 2
Truth or Lie. Write Truth if the statement about the Tuned Radio Frequency and
superheterodyne receiver is correct and Lie if it is incorrect.
1. In a TRF receiver, the antenna amplifies the radio signal.
2. The tuned radio frequency stages consisted of one or more amplifying and tuning stages.
3. Increasing one or more turned circuits will increase the selectivity of the radio receiver.
4. Difficulty in designing at very high frequency, poor audio quality, instability, and poor
selectivity are the problems in TRF receivers.
5. The audio amplifier enables the audio from the amplitude modulation signal to be extracted.
6. Through the process of ganged tuning, tuned amplifiers are tuned to a single frequency (IF).
7. Tuning of the superheterodyne receiver is through the changing of the local oscillator.
8. A supersonic heterodyne wireless receiver was developed to provide an additional level of
fidelity.
9. The IF signals are transmitted through an RF amplifier, and the RF amplifier amplifies the
signal and sends it to the mixer.
10. An audio amplifier amplifies the video signal.
Let us summarize your insights by doing this activity.
Compare and contrast the Tuned Radio Frequency receiver from Supersonic heterodyne
wireless receiver by enumerating their similarities and differences.
ELECTRONICS
Quarter 3 Module 4 Circuit Diagram and Layout of
an AM/FM Receiver
Name:______________________________
Section:_____________________________
You are expected to:
• Interpret the diagram and layout of the components of an AM/FM receiver for accurate
circuit assembly.
Explorative Activities:
Activity 1. Guess What
DIRECTION: Read the statement carefully and identify the correct answer.
__________1. It intercepts and collects the radio signals coming from the radio broadcasting or
transmitting radio stations.
__________2. It selects which of the collected radio signals at the antenna should enter the
radio tuner.
__________3. It prevents the signal from radiating to other circuits in the radio tuner.
__________4. It mixes the signals coming from the antenna that tuned-in by the tuning
capacitor and the signals that come from the local oscillator.
__________5. This section of the radio tuner is like an electronic gate.
__________6. It is also called the demodulator. Its work is to detect and recover the audio
information from the radio signal received by the radio tuner.
__________7. This is found in transistor radio receivers that are made up of a coil of small
wires.
__________8-9. These are two wires wind around the iron core.
__________10. The part of the receiver that is also called as variable capacitor.
Activity 2: NAME THAT SYMBOLS
Direction: Identify each electronic symbol found in AM Radio Receiver’s schematic diagram by
writing the names and the value of the com ponents.
1. Where do you think the reception of radio waves start in the diagram? List down the
components involved.
2. How do L2-2.2µH, TR2, R3-1M, and C3-10nF work in the radio receiver system?
Go with the flow
Direction: Fill out the missing parts of the FM radio receiver block diagram.
1. What is the role of the local oscillator in the block diagram?
2. How does the radio signal received by the antenna convert into sound in the loudspeaker?
ELECTRONICS
Quarter 3 Module Module 5: Steps in Tracking and Aligning
AM/FM Receivers
Name:______________________________
Section:_____________________________
You are expected to:
• Describe the steps in tracking and aligning AM/FM receivers
Explorative Activities:
Let’s do it this way
Directions: Provide the correct words inside the box to complete the figure.
Guide Questions:
1. What is the importance of each illustrated box in the set up?
2. What will happen in the alignment if one of the boxes is not in the setup?
3. What is in the first box? What is its use in the alignment of Intermediate frequency (IF)?
4. What is in the last box? What is its function in the setup?
Assessment 2
Direction: Read each step of intermediate frequency (IF) alignment. Tell whether each step is
correct or incorrect. Write OK if the step is correct and NOT OK if it is incorrect.
1. The signal generator is to be tuned to the very high frequency (VHF) of the radio receiver.
2. The signal generator should be kept in the internal modulation position. The modulation
depth should be adjusted to 30% or above.
3. The attenuator is to be adjusted to a maximum value.
4. The intermediate frequency (IF) signal is to be applied to the collector of the second
intermediate frequency (IF) amplifier through the 0.1 µF capacitance capacitor.
5. The intermediate frequency (IF) signal should be shifted to the second intermediate
frequency (IF) modulator base.
6. The same procedure is to be repeated at the collector and base of the first intermediate
frequency (IF) amplifier. The cores of the corresponding intermediate frequency (IF)
transformer are to be adjusted for maximum output in the power output meter.
7. The signal should be shifted now to the base of the frequency converter transistor. In this
case, the attenuator is to be kept in the minimum position. Now, adjustment of the core of
the intermediate frequency (IF) transformer in the collector of the frequency converter
should be adjusted to get maximum response.
8. Finally, the radio frequency (RF) probe must be kept at a short distance from the ferrite
antenna. The power output meter is to be disconnected and the loudspeaker is to be
connected. A reasonable 800 Hz note will be heard from the speaker showing the receiver’s
sensitivity for intermediate frequency (IF).
9. The alignment of the intermediate frequency (IF) stages should be repeated not more than
twice to finally arrive at the correct setting.
10.Once arrived at the final setting, the cores are to be sealed to prevent tampering of cores by
the user.
Let’s do it this way
Inside the box are words /phrases that are found in the discussion. Make a statement to
describe the word/s or phrases.
ELECTRONICS
Quarter 3 Module Module 6: Testing the Functionality of an
AM/FM Receiver
Name:______________________________
Section:_____________________________
You are expected to:
• Explain the procedure in testing the functionality of an AM/FM receiver
Explorative Activities:
Activity 1: Fact or Bluff
Direction: Write FACT if the statement is correct and write BLUFF if it is incorrect. Write the
answer on the space provided before the number.
__________1. FM is essentially an analog transfer function between audio and RF.
__________2. Testing RSSI involves injecting an RF signal of known power and seeingwhether
the RSSI returns an expected indication-level result within design tolerances.
__________3. To find the FM receiver sensitivity, use a 30 or 60% audio deviation, and measure
the ratio of signal + noise /noise.
__________4. The higher the signal strength that still provides a minimum ratio, the higher the
receiver’s sensitivity.
__________5. Testing for selectivity would involve injecting discrete FM signals of
different carrier frequencies and different signal levels so that one can simulate weak-signal
selection with a strong adjacent-channel signal.
Clue in a Box
Direction: Identify the word/s described in each statement below. Choose your answer in the
box and write it on the blank provided before the number.
____________1. It contains a group of stations spread across the band in any locality.
____________2. It is the relative measure of incoming RF signal strength.
____________3. It is considered a more telling measure of design performance because it
measures everything on the output signal rather than individual harmonics.
____________4. They are also included primarily as a means for sending stored music content
to another FM receiver.
____________5. It is defined as the rms voltage of the harmonics compared to that of the
fundamental tone.
____________6. It is the process whereby one varies the frequency of an RF signal in
accordance with the changes in amplitude of an analog signal.
____________7. It can carry narrow-bandwidth data signals (sent at 1187.5 bps and the
remainder is used for direct band and other subcarrier services.
____________8. This type of test results in a very accurate and stable signal source.
____________9. It is not produced by transmitting separate right- and left-channel signals but,
rather, by a sum and difference of L+R and L-R signals.
____________10. The function of it is to provide a signal that is stable and minimally distorted.
Activity 2: True or False
Direction: Write TRUE if the statement is correct and write FALSE if it is incorrect. Write the
answer on the space provided before the number.
__________1. It is possible to limit the extent of unintended signal energy in the selected
signal’s channel through careful design.
__________2. In an end-user device, the tester must not work through an intermediary (the
device’s CPU or control processor), and the analog output must be accurately digitized for
analysis by the PC.
__________3. Strong adjacent stations, particularly in the presence of a weaker selected signal,
can produce sideband signal energy in the latter’s channel and result in de-sensitization.RSSI FM
broadcast band FM THD+N Module Testing THD Modulation Accuracy FM Transmitters RDS FM
Stereo FM TX
__________4. To test the suppression of AM signals, supply the device with an AM signal having
known FM modulation.
__________5. The objective of verification testing is to fully stimulate and accurately measure
the response to prove the design.
__________6. How accurate is the receiver’s data demodulation? To find out, one sends 26-bit
data blocks to the receiver and compares the decoded result.
__________7. An adequately sensitive receiver is only a partial solution.
__________8. Harmonically related signal products can be caused by inter modulation.
__________9. In AM suppression testing, one wants to measure the FM receiver’s rejection of
amplitude modulation of the signal.
__________10. Crosstalk in a stereophonic system relates to the presence of one channel’s
signal on the other channel.
