Noise in RF systems can generally be regarded as any RF energy that is not the desired signal. Two terms commonly used to describe RF noise are
- Electromagnetic Interference (EMI)
- Radio Frequency Interference (RFI).
EMI is random, broadband noise whereas RFI is narrowband noise broadcast at specific frequencies.
RFI differs to EMI in that it is not unintentionally radiated energy at random power levels, but rather, is simply the presence of unwanted RF signals broadcast by RF transmitter
The good thing about RFI, as opposed to EMI, is that it can often be accommodated as the interfering frequencies usually remain constant. Local television stations, for example, are reasonably easy to identify and avoid.
jnmakuru Changed status to publish March 21, 2023