B-003-10: Receiver fundamentals
B-003-10-01:
Which list of emission types is in order from the narrowest bandwidth to the widest bandwidth?
CW, RTTY, SSB voice, FM voice
CW, SSB voice, RTTY, FM voice
CW, FM voice, RTTY, SSB voice
RTTY, CW, SSB voice, FM voice
B-003-10-02:
The figure in a receiver's specifications which indicates its sensitivity is the:
signal plus noise to noise ratio
audio output in watts
bandwidth of the IF in kilohertz
number of RF amplifiers
B-003-10-03:
If two receivers of different sensitivity are compared, the less sensitive receiver will produce:
less signal or more noise
a steady oscillator drift
more than one signal
more signal or less noise
B-003-10-04:
Which of the following modes of transmission is usually detected with a product detector?
Single sideband suppressed carrier
Double sideband full carrier
Frequency modulation
Pulse modulation
B-003-10-05:
A receiver designed for SSB reception must have a BFO (beat frequency oscillator) because:
the suppressed carrier must be replaced for detection
it beats with the received carrier to produce the other sideband
it reduces the passband of the IF stages
it phases out the unwanted sideband signal
B-003-10-06:
A receiver receives an incoming signal of 3.54 MHz, and the local oscillator produces a signal of 3.995 MHz. To which frequency should the IF be tuned?
455 kHz
7.435 MHz
3.995 MHz
3.54 MHz
B-003-10-07:
What kind of filter would you use to attenuate an interfering carrier signal while receiving an SSB transmission?
A notch filter
A band pass filter
An all pass filter
A pi-network filter
B-003-10-08:
The three main parameters against which the quality of a receiver is measured are:
sensitivity, selectivity and stability
selectivity, stability and frequency range
sensitivity, stability and cross-modulation
sensitivity, selectivity and image rejection
B-003-10-09:
A communications receiver has four filters installed in it, one at 250 Hz, one at 500 Hz, one at 2.4 kHz, and one at 6 kHz. If you were listening to single sideband, which filter would you utilize?
2.4 kHz
250 Hz
6 kHz
500 Hz
B-003-10-10:
A communications receiver has four filters installed in it, one at 250 Hz, one at 500 Hz, one at 2.4 kHz and one at 6 kHz. You are copying a CW transmission and there is a great deal of interference. Which one of the filters would you choose?
250 Hz
500 Hz
2.4 kHz
6 kHz
B-003-10-11:
Selectivity can be placed in the audio stages of a receiver by the utilization of RC active or passive audio filters. If you were to copy CW, which of the following bandpasses would you choose?
750 - 850 Hz
2100 - 2300 Hz
300 - 2700 Hz
100 - 1100 Hz
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