yjun 最近,我用SDR在8MHZ-12MHZ频段,频繁捕捉到一个奇怪的信号(如下图所示),其在瀑布图上呈现出如弹簧般的形状（详见下图）。 经观察，该信号以 40 - 45 秒的周期规律重现。当采用 USB 模式，将带宽设置为 10KHZ 进行解码后，其声音类似快速吐泡泡的声响。 我在网上搜索，发现一个与之极为相似的信号 ——sigidwiki - ROTHR ，无论是从瀑布图的形态，还是声音特征来判断，两者都高度吻合。然而，我不确定它们是否为同一信号,因为根据描述,ROTHR跟美国军方有些关系,这就有点微妙了。不知各位经验丰富的 HAM对此有何见解？这究竟是何种信号呢？
BG2EFX This thing... my principle is Do not operate at frequencies specified on the license. It is recommended to avoid operating, listening, or viewing.
BG5ELQ Why don't you ask the U.S. Department of Defense to do it for you, and also send you a QSL card?
yjun This topic seems inappropriate and isn't generating much interest. Could you please ask the administrator to delete it?😓
BI4MIG It reminds me of the Soviet-era woodpecker. The website you shared is quite interesting, but I think it could also be used for military purposes?
YAOQI Using an SDR to scan frequencies doesn't require a ham radio license or similar, because an SDR is not a ham radio device and does not transmit; it is also not subject to relevant laws and regulations.
tudoubocai YAOQI Is posting on forums considered spreading information? Previously, someone transmitted aviation-related information, including frequencies and content, online, and was penalized as a result.
BloodBlade If I don't know the answer, I can't answer it. And if I do know the answer, I still can't answer it... If you have any questions about things related to mold, ask on Xiaohongshu.
YAOQI tudoubocai Spreading rumors; being penalized was self-inflicted. Just use an SDR to listen in yourself; don't record anything, and don't share it. This won't break any laws.
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