A-002-09: Mixers, frequency multipliers
A-002-09-01:
What is the mixing process?
The combination of two signals to produce sum and difference frequencies
The elimination of noise in a wideband receiver by phase differentiation
The recovery of intelligence from a modulated signal
The elimination of noise in a wideband receiver by phase comparison
A-002-09-02:
What are the principal frequencies that appear at the output of a mixer circuit?
The original frequencies and the sum and difference frequencies
1.414 and 0.707 times the input frequencies
The sum, difference and square root of the input frequencies
Two and four times the original frequency
A-002-09-03:
What occurs when an excessive amount of signal energy reaches the mixer circuit?
Spurious signals are generated
Automatic limiting occurs
A beat frequency is generated
Mixer blanking occurs
A-002-09-04:
In a frequency multiplier circuit, the input signal is coupled to the base of a transistor through a capacitor. A radio frequency choke is connected between the base of the transistor and ground. The capacitor is:
a DC blocking capacitor
part of the input tuned circuit
a by-pass for the circuit
part of the output tank circuit
A-002-09-05:
A frequency multiplier circuit must be operated in:
class C
class AB
class B
class A
A-002-09-06:
In a frequency multiplier circuit, an inductance (L1) and a variable capacitor (C2) are connected in series between VCC+ and ground. The collector of a transistor is connected to a tap on L1. The purpose of the variable capacitor is to:
tune L1 to the desired harmonic
by-pass RF
tune L1 to the frequency applied to the base
provide positive feedback
A-002-09-07:
In a frequency multiplier circuit, an inductance (L1) and a variable capacitor (C2) are connected in series between VCC+ and ground. The collector of a transistor is connected to a tap on L1. A fixed capacitor (C3) is connected between the VCC+ side of L1 and ground. The purpose of C3 is to:
keep RF out of the power supply
form a pi filter with L1 and C2
resonate with L1
by-pass any audio components
A-002-09-08:
In a frequency multiplier circuit, an inductance (L1) and a variable capacitor (C2) are connected in series between VCC+ and ground. The collector of a transistor is connected to a tap on L1. C2 in conjunction with L1 operate as a:
frequency multiplier
frequency divider
voltage divider
voltage doubler
A-002-09-09:
In a circuit where the components are tuned to resonate at a higher frequency than applied, the circuit is most likely a:
a frequency multiplier
a VHF/UHF amplifier
a linear amplifier
a frequency divider
A-002-09-10:
In a frequency multiplier circuit, an inductance (L1) and a variable capacitor (C2) are connected in series between VCC+ and ground. The collector of a transistor is connected to a tap on L1. A fixed capacitor (C3) is connected between the VCC+ side of L1 and ground. C3 is a:
RF by-pass capacitor
DC blocking capacitor
tuning capacitor
coupling capacitor
A-002-09-11:
What stage in a transmitter would change a 5.3-MHz input signal to 14.3 MHz?
A mixer
A linear translator
A frequency multiplier
A beat frequency oscillator
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