10. The various mixer circuits used in frequency conversion in FM receivers offer
varying degrees of noise, gain, and simplicity of construction. Because of their
similarity in construction, a minimum number of additional circuit elements is
required when interchanging the
a. pentagrid converter and pentagrid mixer.
b. triode mixer and dual-triode mixer.
c. diode mixer and crystal mixer.
d. diode mixer and triode mixer.
b. triode mixer.
12. Frequency conversion in a superheterodyne receiver may be accomplished by
either a mixer or a converter. In contrast to a mixer that is used to produce the
IF, a converter is characterized by its
b. high gain at high frequencies.
d. resistance to pulling with a strong input signal.
13. The mixer that provides the least amount of conversion gain
a. triode mixer.
14. The local oscillators in most VHF receivers utilize some form of a Colpitts
a. has a broad tuning range.
c. is immune to supply voltage variations.
d. generates a frequency that is not affected by tube reactances.
15. Assume that a crystal oscillator is to be used as the local oscillator for
The characteristics of the
crystal oscillator must include