B-008-05: Use of filters: low-pass, high-pass, band-pass, band-reject
B-008-05-01:
What type of filter might be connected to an amateur HF transmitter to cut down on harmonic radiation?
A low pass filter
A key-click filter
A high pass filter
A CW filter
B-008-05-02:
Why do modern HF transmitters have a built-in low pass filter in their RF output circuits?
To reduce harmonic radiation
To reduce fundamental radiation
To reduce low frequency interference to other amateurs
To reduce RF energy below a cut-off point
B-008-05-03:
What circuit blocks RF energy above and below a certain limit?
A band pass filter
A high pass filter
An input filter
A low pass filter
B-008-05-04:
What should be the impedance of a low pass filter as compared to the impedance of the transmission line into which it is inserted?
About the same
Substantially lower
Twice the transmission line impedance
Substantially higher
B-008-05-05:
In order to reduce the harmonic output of a high frequency (HF) transmitter, which of the following filters should be installed at the transmitter?
Low pass
Band pass
High pass
Rejection
B-008-05-06:
To reduce harmonic output from a transmitter, you would put a ____________ in the transmission line as close to the transmitter as possible.
low pass filter
high pass filter
band reject filter
wave trap
B-008-05-07:
To reduce energy from an HF transmitter getting into a television set, you would place a ____________ as close to the TV as possible.
high pass filter
low pass filter
wave trap
band reject filter
B-008-05-08:
A band pass filter will:
allow only certain frequencies through
attenuate high frequencies but not low
pass frequencies each side of a band
stop frequencies in a certain band
B-008-05-09:
A band reject filter will:
pass frequencies each side of a band
allow only two frequencies through
pass frequencies below 100 MHz
stop frequencies each side of a band
B-008-05-10:
A high pass filter would normally be fitted:
at the antenna terminals of the TV receiver
between microphone and speech amplifier
at the Morse key or keying relay in a transmitter
between transmitter output and feed line
B-008-05-11:
A low pass filter suitable for a high frequency transmitter would:
attenuate frequencies above 30 MHz
pass audio frequencies above 3 kHz
attenuate frequencies below 30 MHz
pass audio frequencies below 3 kHz
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