Thanks Alex again. I had tried your method but it didn't change anything. But I found that: Some apps are working but not all. I'm now trying receiver examples from: http://www.oz9aec.net/index.php/gnu-radio/grc-examples For example, ssb_rx.py doesn't work but ssb_rx_play works fine. So I guess maybe it's because the source code I down from oz9aec.net is something wrong. I'm trying to figure out where the problem is. Thanks for all and best wishes.
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