Strong broadcast station bandwidth
Purely a curiosity question about bandwidth on a VERY strong AM broadcast station signal. I have a local AM station on 1340 kHz which is around -19 dBm strength, i.e. just below the overload point for the ADC. As the waterfall illustrates, there is a sharp cutoff at the the standard +/- 10 kHz points. But there are still some visible "remnants beyond that during the audio peaks, at much lower strength. I've always wondered if those weak "tails" are actually present in the incoming signal, or is it just a limitation of the FFT on such a powerful signal, close to the ADC overload point? Even if it is truly part of the raw signal, I'm sure it would fully comply broadcast regulations, given the decades lower strength versus the carrier.