E7C: Filters and matching networks: filters and impedance matching networks: types of networks; types of filters; filter applications; filter characteristics; impedance matching; DSP filtering
E7C01:
How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network's input and output?
A capacitor is in parallel with the input, another capacitor is in parallel with the output, and an inductor is in series between the two
Two inductors are in series between the input and output and a capacitor is connected between the two inductors and ground
Two capacitors are in series between the input and output and an inductor is connected between the two capacitors and ground
An inductor is in parallel with the input, another inductor is in parallel with the output, and a capacitor is in series between the two
E7C02:
A T-network with series capacitors and a parallel (shunt) inductor has which of the following properties?
It transforms impedance and is a high-pass filter
It transforms impedance and is a low-pass filter
It transforms reactance and is a low-pass filter
It transforms reactance and is a narrow bandwidth notch filter
E7C03:
What advantage does a Pi-L-network have over a Pi-network for impedance matching between the final amplifier of a vacuum-tube type transmitter and an antenna?
Greater harmonic suppression
Higher efficiency
Lower losses
Greater transformation range
E7C04:
How does a network transform a complex impedance to a resistive impedance?
It cancels the reactive part of an impedance and transforms the resistive part to the desired value
It introduces negative resistance to cancel the resistive part of an impedance
It introduces transconductance to cancel the reactive part of an impedance
Network resistances are substituted for load resistances
E7C05:
Which filter type is described as having ripple in the passband and a sharp cutoff?
A Chebyshev filter
A Butterworth filter
An active LC filter
A passive op-amp filter
E7C06:
What are the distinguishing features of an elliptical filter?
Extremely sharp cutoff, with one or more infinitely deep notches in the stop band
Gradual passband rolloff with minimal stop-band ripple
Extremely flat response over its passband, with gradually rounded stop-band corners
Gradual passband rolloff with extreme stop-band ripple
E7C07:
What kind of audio filter would you use to attenuate an interfering carrier signal while receiving an SSB transmission?
A notch filter
A band-pass filter
A Pi-network filter
An all-pass filter
E7C08:
What kind of digital signal processing audio filter might be used to remove unwanted noise from a received SSB signal?
An adaptive filter
A crystal-lattice filter
A Hilbert-transform filter
A phase-inverting filter
E7C09:
What type of digital signal processing filter might be used in generating an SSB signal?
A Hilbert-transform filter
An adaptive filter
A notch filter
An elliptical filter
E7C10:
Which of the following filters would be the best choice for use in a 2-meter repeater duplexer?
A cavity filter
A crystal filter
A DSP filter
An L-C filter
E7C11:
Which of the following is the common name for a filter network which is equivalent to two L networks back-to-back?
Pi
Pi-L
Cascode
Omega
E7C12:
What is a Pi-L network, as used when matching a vacuum-tube final amplifier to a 50-ohm unbalanced output?
A network consisting of two series inductors and two shunt capacitors
A Phase Inverter Load network
A network with only three discrete parts
A matching network in which all components are isolated from ground
E7C13:
What is one advantage of a Pi matching network over an L matching network?
Q of Pi networks can be varied depending on the component values chosen
L networks can not perform impedance transformation
Pi networks have fewer components
Pi networks are designed for balanced input and output
E7C14:
Which of these modes is most affected by non-linear phase response in a receiver IF filter?
Digital
Meteor Scatter
Single-Sideband Voice
Video
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