The phase noise components spread the power of a signal to adjacent frequencies, resulting in noise sidebands.

Conversely, the passage from one mode to another of adjacent frequency has little influence on the resultant frequency.

Interference from other stations on the same or adjacent frequencies.

Early radio receivers were not very selective and there were frequent disputes over interference between stations with adjacent frequencies.

The transmitted power is concentrated into a limited bandwidth so narrow receiver filters can be used to suppress interference from adjacent frequencies.

The translator has been relocated off-campus after the sale and moved to an adjacent frequency.

Poor rejection of strong signals at adjacent frequencies compared to a superheterodyne receiver.

There is a strong possibility that powerful emissions in the cellular-phone frequency range will spill into the adjacent frequencies essential to radio astronomy.

The nature of adjacent frequencies is not a simple rigid boundary.

The difference of the group time delay of a lightning pulse at adjacent frequencies is proportional to the distance between transmitter and receiver.