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Why? What happens?

The Qansheng's that I've tested have been fine, first harmonic down 44dB, which is OK for the FCC.

However, if you hack the firmware and transmit outside the bands the radio's RF is designed to transmit on, then you will probably see all sorts of spectral weirdness.

Sure, of course, that's to be expected.

I have one too, and it gives off tons of spurious emissions (RF interference).

I pretty much only use it for experimentation and receive.

Did you actually see the spurious emissions on a spectrum analyser?

The old Baofengs had that problem, not Quansheng which are actually clean and the harmonics are within FCC specs.

Another issue is people were “testing” them using an RTLSDR which very easily gets overloaded and shows harmonics where there are none. Even my local FM station shows up on my SDR at frequencies I know they’re not actually transmitting on.

I admit that I have not. But I have used it near other equipment and it causes interference. My Kenwood HT does not.

Ah, ouch. I have two Baofengs as well, I think they're a bit better, but probably not too much better.

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