A-006-01: Single, double conversion superheterodyne architecture
A-006-01-01:
What are the advantages of the frequency-conversion process in a superheterodyne receiver?
Increased selectivity and optimal tuned circuit design
Automatic detection in the RF amplifier and increased sensitivity
Automatic soft-limiting and automatic squelching
Automatic squelching and increased sensitivity
A-006-01-02:
What factors should be considered when selecting an intermediate frequency?
Image rejection
Noise figure and distortion
Interference to other services
Cross-modulation distortion and interference
A-006-01-03:
One of the greatest advantages of the double-conversion over the single-conversion receiver is that it:
suffers less from image interference
is much more stable
is much more sensitive
produces a louder signal at the output
A-006-01-04:
In a communications receiver, a crystal filter would be located in the:
IF circuits
local oscillator
audio output stage
detector
A-006-01-05:
A multiconversion superheterodyne receiver is more susceptible to spurious responses than a single-conversion receiver because of the:
additional oscillators and mixing frequencies involved in the design
poorer selectivity in the IF caused by the multitude of frequency changes
greater sensitivity introducing higher levels of RF to the receiver
AGC being forced to work harder causing the stages concerned to overload
A-006-01-06:
Most superheterodyne receivers operating on the HF amateur bands through to 30 MHz use a standard intermediate frequency (IF) of:
455 kHz
200 kHz
500 kHz
355 kHz
A-006-01-07:
Which stage of a receiver has its input and output circuits tuned to the received frequency?
The RF amplifier
The local oscillator
The audio frequency amplifier
The detector
A-006-01-08:
Which stage of a superheterodyne receiver lies between a tuneable stage and a fixed tuned stage?
Mixer
Radio frequency amplifier
Intermediate frequency amplifier
Local oscillator
A-006-01-09:
A single conversion receiver with a 9 MHz IF has a local oscillator operating at 16 MHz. The frequency it is tuned to is:
7 MHz
16 MHz
21 MHz
9 MHz
A-006-01-10:
A double conversion receiver designed for SSB reception has a beat frequency oscillator and:
two IF stages and two local oscillators
one IF stage and one local oscillator
two IF stages and three local oscillators
two IF stages and one local oscillator
A-006-01-11:
The advantage of a double conversion receiver over a single conversion receiver is that it:
suffers less from image interference
does not drift off frequency
is a more sensitive receiver
produces a louder audio signal
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