Plain-language answer: Receiver overload occurs when strong input energy drives part of the receiver beyond its linear range, creating desensitization, false signals, distortion, or a raised noise floor.
Why the definition matters
The offending signal may be outside the tuned passband if front-end filtering is broad. Preamps and wide antennas can make overload worse.
Use the number correctly
Reduce gain, disable the preamp, add appropriate attenuation or preselection, identify the strong source, and compare the waterfall and audio after each change.
The common mistake
Assuming every visible signal is real while the receiver front end is overloaded.
Measurement and safety boundary
Keep reference units, bandwidth, detector, direction, averaging, and test conditions attached to every number. Current regulator requirements and the complete installed system control RF-exposure compliance.
