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Arguably also the more boring use of SDR; at least for me the interesting bits come from the ability to (de)modulate, filter, process and otherwise mangle signals in a way that would not be feasible with traditional radios. Using SDR to "just" listen in on old modes and bands seems like a waste in comparison.

There are several technical advantages to using SDR (and some downsides), but the benefits are greater. By SDR I mean direct sampling of the HF, such as a Flexradio or HPSDR.

Use an audio pipe an practice demodulating the various modes you can hear.

Also try websdr.org which lists a lot more than just the U. Twente one.

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