Originally the terms were used interchangeably but nowadays most radio users use the term "jamming" to describe the deliberate use of radio noise or signals in an attempt to disrupt communications (or prevent listening to broadcasts)
There is only one electromagnetic spectrum, but by using different carrier frequencies, numerous RF devices can coexist. The world of RF is a world of frequencies. This is true within a single system or even a single PCB, considering that one RF design may involve signals in multiple frequency ranges. But at this point we want to look at the broad context in which a particular RF system exists; the name we give to this concept is “the electromagnetic spectrum.”
Learn about how to transfer maximum power from your amplifier to your antenna, and how to estimate this power using an oscilloscope. An important characteristic of RF technology is the following: it is relatively easy for one person to impede, or even thoroughly ruin, another person’s wireless communication. Radio waves travel through the air and are available to everyone, including those who—intentionally or accidentally—are transmitting signals that could be described as interference.
The basic theory of a jamming system is that when the target receiver(handset devices, walkie talkie, IED, drone, etc.) receives an "effective interference signal" more than the "original signal" 6dB to 20dB in the target channel and location, at this time, target receiver can be jammed.
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