Question

Which of the following is an important reason for using a VHF intermediate frequency in an HF receiver?

a. To improve signal clarity and reduce interference.
b. To increase the range of the receiver.
c. To decrease the overall size of the receiver.
d. To enhance the sensitivity of the receiver to low-frequency signals.

Answer 1

Using a VHF intermediate frequency in an HF receiver helps improve signal clarity and reduce interference by making it easier to reject noise from stray radio sources.

Step-by-step explanation:

An important reason for using a VHF intermediate frequency in an HF receiver is to improve signal clarity and reduce interference. This is because, as we know from FM radio, signals in the VHF range are inherently less subject to noise from stray radio sources compared to those in AM radio. FM receivers can be adjusted to reject amplitudes other than that of the basic carrier wave and only look for variations in frequency, hence more easily rejecting noise which produces a variation in amplitude.