B-008
Subelement B-008
Section B-008-005
Section B-008-005
What is the frequency response of an ideal notch filter?
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Correct AnswerAttenuate one frequency and pass all others
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Attenuate all frequencies except one single frequency
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Attenuate a range of frequencies and pass all others
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Attenuate all frequencies except a range of frequencies
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.
Tags: none
A filter attenuates frequencies below its cut-off frequency of 60 MHz. What type of filter is it?
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Low-pass
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Notch
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Band-pass
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Correct AnswerHigh-pass
What type of filter attenuates RF energy above and below a certain range of frequencies?
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Correct AnswerBand-pass
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Notch
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High-pass
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Low-pass
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.
Tags: none
Why should the impedance of a filter match the transmission line where it is inserted?
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To minimize noise in the receiver
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Correct AnswerTo avoid unwanted reflection
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To prevent spurious emissions
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To preserve the balance of the line
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.
Tags: none
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?
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Band-reject
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Band-pass
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Correct AnswerLow-pass
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High-pass
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?
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Band-pass
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Correct AnswerLow-pass
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Band-reject
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High-pass
A strong interfering signal is very close to your receive frequency. Which type of filter can effectively suppress it?
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Low-pass
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High-pass
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Correct AnswerNotch
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Band-reject
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
In a Field Day operation with separate transmitters assigned to specific bands, what type of filter is needed on the receivers to minimize interference?
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Correct AnswerBand-pass
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Low-pass
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Band-reject
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High-pass
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
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?
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Band-pass
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Low-pass
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High-pass
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Correct AnswerBand-reject
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
Your 2-metre station suffers receiver overload from several land mobile service transmitters on adjacent bands. What type of filter could help?
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Low-pass
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Correct AnswerBand-pass
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Notch
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High-pass
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
A filter attenuates frequencies above its cut-off frequency of 40 MHz. What type of filter is it?
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Correct AnswerLow-pass
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Notch
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High-pass
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Band-pass
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