如图：[upl-image-preview uuid=1009b3e0-f957-4aa9-8850-825fdd288281 url=https://storage.hamcq.cn/2026-07-18/1784384838-255727-img-8754.jpg alt={TEXT?}] 该信号自2025年9月出现，截至今日仍在持续发射，此信号每两条竖线间间隔21KHz，偶有功率变化，带宽约0.4MHz，信号的其他信息随时间基本不变，每竖线间是连续的，应该不是跳频信号；视频无法上传，信号可以打开对讲机静噪，听起来是类似大型电动机或水泥泵车工作时的声音，该干扰覆盖及其巨大，在宝鸡，渭南，西安等地都能收到，严重干扰业余通信，向西安监测站求助，监测站的工作人员协助利用固定站测向，发现位于西安高新区，但真当我们去了，却发现此处干扰信号强度较低，怀疑多径效应和山体反射导致。现在我们自己测向，方向是几百公里外的彬县，永寿县，乾县，长武，甚至甘肃庆阳宁县，都有可能，如果有居住在以上地区的ham，能否帮忙监听一下是否有信号？如果有熟悉各种信号制式的ham，能否识别出此信号的类型等信息？非常感谢！

433附近么，是不是什么lora信号或者信标信号

@"BG6HFD"#p99481 直接就在438.5，没在433

如果信号源附近山体/大型金属物体多（变电站、厂房、工厂高塔等），测向可能不准确。看描述推测，要不是数传设备，但21kHz这样的间隔也有点像什么直流电机的干扰。也许要重点看看附近的工厂，同时也建议看看其它频段有无类似特征的干扰信号存在

这玩意就是各种电器设备发出来的干扰信号，应该叫电磁泄露吧。按理说应该是很小的，不应该这么大面积，如果到处都能收到，那它的功率将会非常惊人，而且你在不同地方收到的大小应该也有较大变化。参考一下广播信号，千瓦级别的功率，覆盖范围也就上百公里（广播频段更低，传播更远），而且不同地方接收到的强度变化也非常明显。

@"BG9OWJ"#p99487 基本没啥变化，非常离谱，不偏不倚刚好在438.5上，在其他频率（无委最开始怀疑219.25）也没找到一丁点信号类似这样的，最大就是+20dBμV我们自己测的，无委监测站测出来十几公里外是13左右，三十公里外差不多10左右

@"BG6HFD"#p99483 他每回发射就是固定三十秒，但每回发射的间隔不一样

@"BG9OWJ"#p99487 目前怀疑是在西安北边方向，但是测向站全测的朝西南，不知道为啥，南边秦岭全是山

对比一下433的信号一样就是LORA 不一样就是其他形式的数传

@"BG2EFX"#p99500 不一样，433很杂乱，我们这个规律非常强

@"BG2EFX"#p99500 关键不知道这是什么调制的，连是不是数传都说不来

Could you please identify this signal?

BI9BUM

BD6JYO Because the signal strength was still fluctuating around approximately 5 dBu during transmission, I suspected that it might be radar.

BD6JYO

BI9BUM If it's present on my end, it's likely a radar. However, I suspect it might be a specialized jamming device produced by a small workshop, which falls outside of our main business scope. But then I thought about using 430MHz for radar and wondered if it would work effectively. I want to try capturing this signal and determine its direction.

BG7NQF

I was in the high-tech zone... shivering. I had heard something near West Avenue before, but I didn't use frequency 438.500 and just moved away.

BA4JPR

I am also experiencing this issue. After investigation, I found that it was caused by interference from my mouse while charging.
It will produce a "buzzing" sound at 438.5 MHz, which is sufficient to overcome the noise, and using the spectrum function of the k6, it will generate a series of small peaks that move to the left, similar to what you are experiencing. However, I cannot confirm this definitively because I don't have an SDR.
I hope this helps! If you are experiencing similar signals, it can be confirmed that the issue is actually caused by electromagnetic leakage from small appliances. This is a common problem in many cities due to the large number of these devices.
The video is too large to upload.😂

BD6JYO

BA4JPR The power interference doesn't cover such a wide area; the interference from small appliances can be eliminated.

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