As a long time radio amateur (who is no longer very active) I "fight" this kind of thing all the time. Many MANY components we deal with every day affect radio reception at some level. AT HF one of the worst offenders in my home was my old cellphone charger--a tiny switch mode charger that created havoc on HF from the AM broadcast band on up through 7 Mhz (the amateur 40M band)
Another aspect that diodes--whether LE(diodes) or some other type, or any other solid state digital device containing transistors--which can ACT like diodes, can be the cause of (one term) "external mixing." This is in other words the "crystal radio effect" or also called the "rusty drainpipe."
For those of us who have seen/ heard this, and worked in the industry, once example is this:
You are doing a job/ install/ repair at a radio site, with multiple transmitters. You tune in a weak signal on your wide-band hand held radio, which you carry with you for testing as well as communication. You take two screwdrivers and rub them together. This "makes" a poor contact "crystal radio" effect, and causes various active transmitters at the site to develop spurious mixing products both harmonic and sum/ difference products of either or both transmitters..........AND JUST LIKE THAT you have noise in your receiver.
There are LOTS of electronic devices that can cause interference to and from radio communications.
Another "good" example of how bad things are is the "new" digital TV. "In the old days" we had ghosts, noise in the audio, abberations of various kinds on our TV tube. But now we don't SEE those--the digital TV simply blanks audio, freezes, or the display goes black. BUT THE SAME types of interference that existed "then" still serves to disrupt over-the-air TV signals now!!
