A strange phenomenon

#1

A strange phenomenon occurs on my LIMESDR. FM signals can be received at the HF frequency. For example, a 90M FM radio can be received at 3M frequency. Is this a hardware problem? My LIME version is 1.4S.

#2

No, this is to be expected with an SDR and strong signals, due to aliasing. If it causing you problems you can reduce/remove this with filtering. There are vendors that sell e.g. “band stop” filters for broadcast radio and TV bands, which are the most common source of problems.

#3

Thank you very much

#4

Bandpass filtering will help in all regions that you recieve in. It filters out frequencies higher & lower than the ones you are interested in.

Ed

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