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For the purpose of this answer, I'll lump interesting unknown signals and RFI together and call them "mysterious signals", since the techniques for finding where they come from are often the same. Some of the techniques listed below may not work for all bands and power levels. Often it would help to know how local the mysterious signal is. If you ...


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One thing most certain is that you need a directional antenna (most popular is Yagi). They are pretty easy and cheap to build and will help tremendously because you can triangulate the signal. The remaining answer depends how much money you want to spend. The cheapest would probably be a $20 RTL SDR dongle (if you have a laptop). Many people use an actual ...


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From the wide spectrum screenshot it's evident your receiver is seriously overloaded. Note: the signal around 445.982 which appears to be identical other than being "flipped", and a little stronger. This comes from IQ imbalance in the receiver. additional copies of the signal all over the place. These are caused by intermodulation and harmonic ...


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Short answer: No. Long answer: Your accidental receiver can't see the data that's being received. Also, you're listening to an effect of the uplink, not the downlink. Also, cryptography. Longer answer: What you're referring to is interference where you can hear the power modulation by data bursts emitted by your phone. Why your phone and not the mast? Your ...


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