KE7IZL
Member
I hate to have to put this question in a general wireless section of the forum, but I couldn't find a proper section anywhere else for asking about identifying a signal type.
I found this unusual signal in the FM band while using my HackRF SDR radio and tuning through the normal FM broadcast band. It appears both above and below the main FM carrier for a particular station. Unlike the digital signal that's modulated onto the FM carrier that carries information about the station such as the name of the currently playing song, this signal is separate from the main carrier, and it appears there's 2 copies, one above and one below the FM carrier. The signal looks spectrally flat across its bandwidth, with sharp cutoffs at its upper and lower edge, and it's about 70kHz wide. I live in the US, but was unaware of any digital radio service used in the FM band here. I've read that in Europe they have something called DRM (digital radio mondiale), but I didn't know of anything like that being used in the US. Can someone here explain what this signal might be?
I found this unusual signal in the FM band while using my HackRF SDR radio and tuning through the normal FM broadcast band. It appears both above and below the main FM carrier for a particular station. Unlike the digital signal that's modulated onto the FM carrier that carries information about the station such as the name of the currently playing song, this signal is separate from the main carrier, and it appears there's 2 copies, one above and one below the FM carrier. The signal looks spectrally flat across its bandwidth, with sharp cutoffs at its upper and lower edge, and it's about 70kHz wide. I live in the US, but was unaware of any digital radio service used in the FM band here. I've read that in Europe they have something called DRM (digital radio mondiale), but I didn't know of anything like that being used in the US. Can someone here explain what this signal might be?
