LESSON 1
RADIO RECEIVER CHARACTERISTICS
SCOPE ....................................Reception of radio waves; block diagram
of AM radio receiver; beat frequencies;
mixers;
selectivity;
sensitivity;
fidelity; signal-to-noise ratio.
CREDIT HOURS .............................1
TEXT ASSIGNMENT ..........................TM 11-665, para 102, 106, 122-126
MATERIALS REQUIRED .......................None
SUGGESTIONS ..............................Disregard references to trf receivers in
the text. This subcourse deals only with
superheterodyne receivers.
LESSON OBJECTIVES
When you have completed this lesson, you will be able to:
1. Describe the characteristics of a mixer.
2. Describe the effects of selectivity, sensitivity, and signal-to-noise ratio on
radio reception.
3. Explain the principles of heterodyne action.
4. Analyze each stage of a radio receiver, using the block diagram.
DNI CORRECTIONS TO TM 11-665
Page 167, para 102b, line 8, delete "I-C (inductance-capacitance)" and substitute
L-C (inductance-capacitance) circuits.
LESSON EXERCISES
In each of the following exercises, select the ONE answer that BEST completes
the statement or answers the question.
Indicate your solution by circling the
letter opposite the correct answer in the subcourse booklet.
322 L1
2
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