c. radio-frequency choke RFC.
d. capacitors C1 and C2, and inductor L1.
2. Figure 74 of TM 11-665 is a schematic representation of an untuned impedance
coupling circuit. In this type of coupling circuit, harmonic frequencies will
a. not be generated.
b. be amplified by the second tube.
c. be filtered by the RF choke in the grid circuit of the second tube.
d. be filtered by the capacitor in the grid circuit of the second tube.
3. The unity-coupled (one-to-one turns ratio) RF transformer is seldom used in
military transmitters because
a. it is very expensive.
b. the coupling cannot be changed.
c. it is too bulky and heavy for portable equipment.
d. the coupling is difficult to adjust for proper excitation.
4. Interstage coupling is used to insure that when RF energy is transferred from
one stage to the next, it is done with a minimum amount of loading and power loss,
providing sufficient energy to excite the next stage.
If the two stages are
separated by any appreciable distance, it would be advantageous to use
b. impedance coupling.
d. link coupling.
5. Assume that a series-resonant circuit has a capacitive reactance of 600 ohms
and a circuit resistance of 4 ohms.
If 2 volts are developed across the
resistance, how much voltage is developed across the reactance?
a. 4 volts
c. 300 volts
b. 150 volts
d. 600 volts
6. The method of interstage coupling that can be used in a transmitter to
produce a voltage increase between the output of one stage and the input of the
next is
a. link coupling.
b. impedance coupling.
321 L3
14
Previous Page
