2016-E7C: Filters and matching networks: types of networks; types of filters; filter applications; filter characteristics; impedance matching; DSP filtering
How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network's input and output?
A capacitor is connected between the input and ground, another capacitor is connected between the output and ground, and an inductor is connected between input and output
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 connected between the input and ground, another inductor is connected between the output and ground, and a capacitor is connected between the input and output
Which of the following is a property of a T-network with series capacitors and a parallel shunt inductor?
It is a high-pass filter
It is a low-pass filter
It is a band-pass filter
It is a notch filter
What advantage does a Pi-L-network have over a regular Pi-network for impedance matching between the final amplifier of a vacuum-tube transmitter and an antenna?
Greater harmonic suppression
Greater transformation range
How does an impedance-matching circuit transform a complex impedance to a resistive impedance?
It cancels the reactive part of the impedance and changes the resistive part to a desired value
It introduces negative resistance to cancel the resistive part of impedance
It introduces transconductance to cancel the reactive part of impedance
Network resistances are substituted for load resistances and reactances are matched to the resistances
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
What are the distinguishing features of an elliptical filter?
Extremely sharp cutoff with one or more notches in the stop band
Gradual passband rolloff with minimal stop band ripple
Extremely flat response over its pass band with gradually rounded stop band corners
Gradual passband rolloff with extreme stop band ripple
What kind of 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
Which of the following factors has the greatest effect in helping determine the bandwidth and response shape of a crystal ladder filter?
The relative frequencies of the individual crystals
The DC voltage applied to the quartz crystal
The gain of the RF stage preceding the filter
The amplitude of the signals passing through the filter
What is a Jones filter as used as part of an HF receiver IF stage?
A variable bandwidth crystal lattice filter
An automatic notch filter
A special filter that emphasizes image responses
A filter that removes impulse noise
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
Which of the following is the common name for a filter network which is equivalent to two L-networks connected back-to-back with the two inductors in series and the capacitors in shunt at the input and output?
Which describes a Pi-L-network used for matching a vacuum tube final amplifier to a 50 ohm unbalanced output?
A Pi-network with an additional series inductor on the output
A Phase Inverter Load network
A network with only three discrete parts
A matching network in which all components are isolated from ground
What is one advantage of a Pi-matching network over an L-matching network consisting of a single inductor and a single capacitor?
The Q of Pi-networks can be varied depending on the component values chosen
L-networks cannot perform impedance transformation
Pi-networks have fewer components
Pi-networks are designed for balanced input and output
Which mode is most affected by non-linear phase response in a receiver IF filter?
What is a crystal lattice filter?
A filter with narrow bandwidth and steep skirts made using quartz crystals
A power supply filter made with interlaced quartz crystals
An audio filter made with four quartz crystals that resonate at 1kHz intervals
A filter with wide bandwidth and shallow skirts made using quartz crystals
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