Frequency components much less prominent at the receiver for multiple tones

1. What type of receiver uses a mixer to convert the received signal to a lower frequency?
2. How can you improve selectivity of a receiver?
3. Why is frequency diversity useful?
4. What determines the selectivity of a receiver?

What type of receiver uses a mixer to convert the received signal to a lower frequency?

The superheterodyne receiver uses one or more mixers and local oscillators to convert the received signal channel to another frequency band for more convenient filtering and amplification.

How can you improve selectivity of a receiver?

More tuned circuits in series lead to the better selectivity of the receiver.

Why is frequency diversity useful?

Frequency diversity allows the transmission of the same message signal at different carrier frequencies. In order for the received signals to be statistically independent or at least uncorrelated, the carrier frequencies must have a separation that is greater than the coherence bandwidth of the radio channel.

What determines the selectivity of a receiver?

The selectivity of a radio receiver is the characteristic of the receiver which determines the extent to which the receiver is capable of distinguishing between a signal, that is a signal in a channel to which the radio receiver is tuned, and other signals, that is, signals in channels to which the receiver is not ...