FWIW, I am an electrical engineer, but I don't tend to advertise that much because we aren't infallible. My field of expertise has shifted to IT and management over the past 20 years so my EE background can be challenged at any time and I have to do research just like anyone else to counter this arguments. It's apparently difficult to understand the concept of the constant carrier signal at 50Hz. It's always there no matter what. This is classic behavior of a PAM device. Keep in mind, typically PFM and PAM are used for data transmission and have a signal decoder on the other end of the transmission. In this application the decoder is our mouth! LoL
I should say, rather than decoder the correct term would be "demodulator"
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You're kind of the same as me Dam718, Did the electronics thing back in 89 was when I took my CET test then moved over to IT and over the past 25yrs forgot more than I had learnt. So I know exactly where your coming from. And that's not even counting old age. lol