Question
Download Solution PDFWhy crystal receiver has poor selectivity?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct option is 4
Concept:
The selectivity of a radio receiver is its ability to select a particular signal station and reject others in the frequency spectrum.
- A crystal radio receiver, or crystal set, is a very simple radio receiver, popular in the early days of radio. It needs no other power source but that received from radio waves by an antenna.
- It uses a crystal detector (composed of a piezoelectric crystal such as galena) to demodulate the signal.
- In a crystal receiver, there oftentimes isn't a clear, defined "tuned circuit." A tuned circuit (like an LC circuit) allows for specific frequencies to be selected and others to be rejected, improving the selectivity of the receiver.
The other options:
1) No loudspeaker is used: This might affect the volume or audibility but not the selectivity.
2) No battery is used: The absence of batteries is a defining feature of crystal radios, but this doesn't directly impact their selectivity.
3) It has a long antenna: The length of the antenna can affect reception, but doesn't directly correlate to the selectivity of the receiver.
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