A-007-01: Antenna tuner/transmatch, impedance matching circuits
A-007-01-01:
For an antenna tuner of the "Transformer" type, which of the following statements is FALSE?
The circuit is known as a Pi-type antenna tuner (transmatch)
The input is suitable for 50 ohm impedance
The output is suitable for impedances from low to high
The circuit is known as a transformer-type antenna tuner (transmatch)
A-007-01-02:
For an antenna tuner of the "Series" type, which of the following statements is FALSE?
The circuit is known as a Pi-type antenna tuner (transmatch)
The circuit is known as a Series-type antenna tuner (transmatch)
The output is suitable for impedances from low to high
The input is suitable for impedance of 50 ohms
A-007-01-03:
For an antenna tuner of the "L" type, which of the following statements is FALSE?
The circuit is suitable for matching to a vertical groundplane antenna
The transmitter input is suitable for 50 ohms impedance
The antenna output is high impedance
The circuit is known as an L-type antenna tuner (transmatch)
A-007-01-04:
For an antenna tuner of the "Pi" type, which of the following statements is FALSE?
The circuit is a series-type antenna tuner (transmatch)
The transmitter input is suitable for impedance of 50 ohms
The antenna output is suitable for impedances from low to high
The circuit is a Pi-type antenna tuner (transmatch)
A-007-01-05:
What is a pi-network?
A network consisting of one inductor and two capacitors or two inductors and one capacitor
An antenna matching network that is isolated from ground
A network consisting of four inductors or four capacitors
A power incidence network
A-007-01-06:
Which type of network offers the greatest transformation ratio?
Pi-network
Chebyshev
Butterworth
L-network
A-007-01-07:
Why is an L-network of limited utility in impedance matching?
It matches only a small impedance range
It is thermally unstable
It is prone to self-resonance
It has limited power handling capability
A-007-01-08:
How does a network transform one impedance to another?
It cancels the reactive part of an impedance and changes the resistive part
It produces transconductance to cancel the reactive part of an impedance
It introduces negative resistance to cancel the resistive part of an impedance
Network resistances substitute for load resistances
A-007-01-09:
What advantage does a pi-L network have over a pi-network for impedance matching between a vacuum tube linear amplifier and a multiband antenna?
Greater harmonic suppression
Higher efficiency
Lower losses
Greater transformation range
A-007-01-10:
Which type of network provides the greatest harmonic suppression?
Pi-L network
Inverse pi-network
Pi-network
L-network
A-007-01-11:
Which three types of networks are most commonly used to match an RF power amplifier to a transmission line?
L, pi and pi-L
T, M and Q
M, pi and T
L, M and C
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