What is Transmitter Noise Interference?
Transmitter noise interference occurs because a transmitter radiates energy on its operating frequency as well as frequencies above and below the assigned frequency. The energy that is radiated above and below the assigned frequency is known as sideband noise energy and extends for several megahertz on either side of the operating frequency. This undesired noise energy can fall within the passband of a nearby receiver even if the receiver’s operating frequency is several megahertz away. The transmitter noise appears as “on-channel” noise interference and cannot be filtered out at the receiver. It is on the receiver’s operating frequency and competes with the desired signal, which in effect, degrades the operational performance.
