Our spectrum analyser picked up a large burst of electrical interference coming from a house.

This deactivates the bell wire, an obsolete part of telephone wiring that was once used to make phones ring, but now merely creates electrical interference.

Proponents of discrete circuits argue that because discrete components are larger, they carry a higher voltage and are less susceptible to electrical interference.

Check if there are radio transmitters in close proximity and also consider electrical interference from power plants or lift rooms, etc.

A system was also installed inside a steel works and worked reliably despite the very high levels of electrical interference.