To be able to ascertain the existence with the DARC signal we likely have to dig further (like opening Yet another Section of a matroska doll) and demodulate/decimate this WBFM signal right down to ninety six kHz and look at the spectrum once again, Specially all-around seventy six kHz.
When you are in Munich and use public transportation, Primarily Buses and Trams, you'll have recognized that during the past handful of month plenty of new shows appeared at Nearly any station which experienced no real-time data Exhibit in advance of. They clearly don't have any cables/connections and no seen antennas, so I retained wanting to know:
In addition there was also this radio board article which amplified the level of perceived likelihood that there is likely to be a signal on 90 MHz (B5 Aktuell) transmitted from Ismaning.
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The large surprise in this article is always that B5 is apparently a mono sign, all stereo parts are lacking within the multiplex blend. Nonetheless, to the 4th we can Obviously see a digital signal that matches the characteristics we might expect from the DARC sign.
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LMSK modulation would want a pilot tone for synchronization but as it is a mono sign there is no pilot tone. Based on ETSI EN three hundred 751 DARC will just merely be MSK modulated. Let's see how it appears to be like after we get even closer:
Considering the fact that this particular signal can only be gained in Munich, Here are a few dump files 123maxx to download, for intelligent, Artistic or bored minds anyplace else, who might benefit from the obstacle to go just after it way too. If you need far more or other resources/parameters, just fall a Take note.
At least considerably ample to hack a crude a 3m dipole (aligned horizontally!), pick up an RTL-SDR/E4K stick and hack a receiver in GNU Radio to try to verify which the signal actually exists. Verification
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When GNU Radio creates choppy audio with pulseaudio and logs plenty of aUaUaUaU's within the console, you may check out the subsequent resolve, it assisted below: