On: The truth about ferrites

For people wondering what QRM stands for, it is an old code word, not an abbreviation.

https://www.onallbands.com/word-of-the-day-qrm-what-is-qrm-i...

Thanks. >> "QRM stands for human-made noise, as opposed to QRN, which indicates noise from natural sources."

You beat me to it. I had it in my clipboard.