I, along with many other friends who use APRSDroid, have encountered the same issue: we can only transmit signals, but we cannot decode any received signals. The volume bar indicates that audio is being input, and it reaches 50% length, but many users of APRSDroid report no decoding problems. Therefore, I'm not sure what determines whether or not a signal can be decoded – is it the quality of the signal, or the signal strength? Despite having the same receiving conditions, Direwolf, Soundmodem, and AGWpe on my computer, as well as APRS Pro on my iPhone, all decode successfully. I have confirmed that APRSDroid can indeed decode signals, but only once: when I was testing a remote repeater, I discovered that it also received a beacon from the repeater itself. At that time, I didn't understand why this happened. Does anyone else in the forum have any experience with this?