Canadian Basic Qualification pool, section B-008-005

Subelement B-008

B-008

Section B-008-005

B-008-005-001

What is the frequency response of an ideal notch filter?

Correct Answer
A.
Attenuate one frequency and pass all others
B.
Attenuate all frequencies except one single frequency
C.
Attenuate a range of frequencies and pass all others
D.
Attenuate all frequencies except a range of frequencies

B-008-005-001

The particular narrowness of the notch filter distinguishes it from a band-reject filter. An "ideal" notch filter would reject one frequency only.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-008-005-002

A filter attenuates frequencies below its cut-off frequency of 60 MHz. What type of filter is it?

A.
Low-pass
B.
Notch
C.
Band-pass
Correct Answer
D.
High-pass

B-008-005-002

The clues: attenuation below a single cut-off frequency. Hence, the filter passes frequencies above that cut-off frequency.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-008-005-003

What type of filter attenuates RF energy above and below a certain range of frequencies?

Correct Answer
A.
Band-pass
B.
Notch
C.
High-pass
D.
Low-pass

B-008-005-003

Key words: BLOCKS ABOVE AND BELOW. A 'band-pass' filter lets frequencies between two design limits pass unaffected. Outside of that range, attenuation is present. A 'high-pass' filter passes frequencies above a certain limit but attenuates lower frequencies. A 'low-pass' filter lets frequencies below its cut-off frequency pass unimpeded but attenuates higher frequencies.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-008-005-004

Why should the impedance of a filter match the transmission line where it is inserted?

A.
To minimize noise in the receiver
Correct Answer
B.
To avoid unwanted reflection
C.
To prevent spurious emissions
D.
To preserve the balance of the line

B-008-005-004

All filters are designed with a given impedance in mind. The source impedance and load impedance must match the design criteria of the filter to prevent reflections, giving rise to a standing wave ratio (SWR), and to allow the filter to deliver the expected frequency response.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-008-005-005

Listening to shortwave on a low-cost software defined receiver (SDR), you hear several stations known to operate on much higher frequencies. What type of filter could help?

A.
Band-reject
B.
Band-pass
Correct Answer
C.
Low-pass
D.
High-pass

B-008-005-005

You wish to retain access to a large swath of frequencies below a certain limit: the low-pass filter is the most appropriate.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-008-005-006

You need to install an AC line filter to reduce radio frequency noise heard in your station equipment. What type of frequency response should it have?

A.
Band-pass
Correct Answer
B.
Low-pass
C.
Band-reject
D.
High-pass

B-008-005-006

The AC line filter must pass current at 60 Hz, but reject all radio signals: this is an extreme case of a low-pass filter!

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-008-005-007

A strong interfering signal is very close to your receive frequency. Which type of filter can effectively suppress it?

A.
Low-pass
B.
High-pass
Correct Answer
C.
Notch
D.
Band-reject

B-008-005-007

Eliminating a single signal close to a desired frequency is the purpose of a notch filter. The particular narrowness of the notch filter distinguishes it from a band-reject filter.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-008-005-008

In a Field Day operation with separate transmitters assigned to specific bands, what type of filter is needed on the receivers to minimize interference?

Correct Answer
A.
Band-pass
B.
Low-pass
C.
Band-reject
D.
High-pass

B-008-005-008

To retain the ability to operate across an entire band while attenuating signals on adjacent bands, the band-pass filter is the ideal choice.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-008-005-009

A nearby high-power HF broadcast station in the 31-metre band is interfering with your reception on the 40-metre and 30-metre bands. What type of filter is needed on the receiver to minimize interference?

A.
Band-pass
B.
Low-pass
C.
High-pass
Correct Answer
D.
Band-reject

B-008-005-009

The most expedient solution is to strongly attenuate the offending signal rather than build separate pass-band filters for your two target bands. A notch filter is a special case of a band-reject filter.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-008-005-010

Your 2-metre station suffers receiver overload from several land mobile service transmitters on adjacent bands. What type of filter could help?

A.
Low-pass
Correct Answer
B.
Band-pass
C.
Notch
D.
High-pass

B-008-005-010

You want access to an entire band while eliminating signals on adjacent bands above and below the desired band: the band-pass is the most appropriate.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-008-005-011

A filter attenuates frequencies above its cut-off frequency of 40 MHz. What type of filter is it?

Correct Answer
A.
Low-pass
B.
Notch
C.
High-pass
D.
Band-pass

B-008-005-011

The clues: attenuation above a single cut-off frequency. Hence, the filter passes frequencies below that cut-off frequency.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

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