Canadian Advanced pool, section 7-01

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Subelement 7

Feedlines - Matching and Antennas

Section 7-01

antenna tuner/transmatch, impedance matching circuits

7-01-01

For an antenna tuner of the "Transformer" type, which of the following statements is False?

A.
The input is suitable for 50 ohm impedance
B.
The output is suitable for impedances from low to high
Correct Answer
C.
The circuit is known as a Pi-type antenna tuner (transmatch)
D.
The circuit is known as a transformertype antenna tuner (transmatch)

7-01-01

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7-01-02

For an antenna tuner of the "Series" type, which of the following statements is False?

A.
The circuit is known as a Series-type antenna tuner (transmatch)
B.
The output is suitable for impedances from low to high
C.
The input is suitable for impedance of 50 ohms
Correct Answer
D.
The circuit is known as a Pi-type antenna tuner (transmatch)

7-01-02

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7-01-03

For an antenna tuner of the "L" type, which of the following statements is False?

A.
The transmitter input is suitable for 50 ohms impedance
B.
The antenna output is high impedance
Correct Answer
C.
The circuit is suitable for matching to a vertical groundplane antenna
D.
The circuit is known as an L-type antenna tuner (transmatch)

7-01-03

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7-01-04

For an antenna tuner of the "Pi" type, which of the following statements is False?

A.
The transmitter input is suitable for impedance of 50 ohms
B.
The antenna output is suitable for impedances from low to high
Correct Answer
C.
The circuit is a series-type antenna tuner (transmatch)
D.
The circuit is a Pi-type antenna tuner (transmatch)

7-01-04

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7-01-05

What is a pi-network?

A.
An antenna matching network that is isolated from ground
B.
A network consisting of four inductors or four capacitors
Correct Answer
C.
A network consisting of one inductor and two capacitors or two inductors and one capacitor
D.
A power incidence network

7-01-05

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7-01-06

Which type of network offers the greatest transformation ratio?

A.
Chebyshev
B.
Butterworth
Correct Answer
C.
Pi-network
D.
L-network

7-01-06

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7-01-07

Why is an L-network of limited utility in impedance matching?

A.
It is thermally unstable
Correct Answer
B.
It matches only a small impedance range
C.
It is prone to self-resonance
D.
It has limited power handling capability

7-01-07

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7-01-08

How does a network transform one impedance to another?

A.
It produces transconductance to cancel the reactive part of an impedance
B.
It introduces negative resistance to cancel the resistive part of an impedance
Correct Answer
C.
It cancels the reactive part of an impedance and changes the resistive part
D.
Network resistances substitute for load resistances

7-01-08

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7-01-09

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?

Correct Answer
A.
Greater harmonic suppression
B.
Higher efficiency
C.
Lower losses
D.
Greater transformation range

7-01-09

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7-01-10

Which type of network provides the greatest harmonic suppression?

A.
Inverse pi-network
B.
Pi-network
Correct Answer
C.
Pi-L network
D.
L-network

7-01-10

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7-01-11

Which three types of networks are most commonly used to match an RF power amplifier to a transmission line?

A.
T, M and Q
B.
M, pi and T
Correct Answer
C.
L, pi and pi-L
D.
L, M and C

7-01-11

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