LESSON 2
SIGNAL INPUT CIRCUITS
SCOPE ....................................Antenna coupling; interstage coupling; RF
amplifiers;
frequency
conversion
and
tracking;
stability;
transistorized RF amplifiers, mixers and
local oscillators.
CREDIT HOURS .............................2
TEXT ASSIGNMENT ..........................TM 11-665, para 107-112, 127-134, 149;
Attached Memorandum, para 2-1 through 2-4
MATERIALS REQUIRED .......................None
SUGGESTIONS ..............................Read assignment in TM 11-665
before
reading the attached memorandum.
LESSON OBJECTIVES
When you have completed this lesson, you will be able to:
1. Identify the various methods of antenna coupling and interstage coupling.
2. State the characteristics of triode and pentode RF amplifiers.
3. Explain the characteristics of mixers and frequency converters.
4. Perform frequency tracking adjustments in a receiver.
5. State the importance of stability in local oscillators.
6. Explain the
operation
of
transistorized
RF
amplifiers,
mixers,
and
local
ATTACHED MEMORANDUM
2-1.
TRANSISTORS USED IN AM RADIO RECEIVERS
Transistors used in AM radio receivers can be classified into two groups: low-
power and high-power. Junction types are preferred to the point-contact
322 L2
6
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