Talk:Digital Audio Broadcasting Plus (DAB+)
Probably a DAB+ channel? See http://www.broadcast.ch/data_program_dab.aspx?lang=en, channel 7D/194.064 MHzMegaHertz (MHz) 10^6 Hz (Band III) EID 4002
Signal Quality[edit]
The plots show wildly "swinging" carriers – this looks like either the receiver was subject to *extreme* local oscillator fluctuation, or was strapped to a high-velocity centrifuge.
There's nothing in these OFDMOrthogonal Frequency-Division Multiplexing signals that makes them meander in spectrum.
Pictures[edit]
Commented out pictures and Youtube video at bottom of page, removed signal template picture entry – the receiver not only exhibited bad frequency stability, in my experience, with sufficient SNR, the very high number of subcarriers also leads to a much crisper signal shape, so that the pictures were actually a really unsuitable representation of the signal at hand. It looks like the pictures/video only show a very small excerpt of the overall signal, too – so I'm pretty sure we *cannot* say that the former pictures "show" a DAB+ signal's spectral shape – they show a badly cut excerpt of a badly recorded signal, and hence are more confusing than clarifying.
Fair enough. I do not live in Europe, so I cannot grab better DAB+ samples on my own. I am at the mercy of whatever DAB+ IQQuadrature signals form the basis of complex RF signal modulation and demodulation, both in hardware and in software, as well as in complex signal analysis. samples exist on the internet or what users submit. Not everyone knows how to avoid multi-path interference like that. --Cartoonman (talk) 15:18, 16 September 2017 (NZST)
