I get a repetitive rapid ticking noise in a well-defined band between 52-56 kHz. It comes and goes but mostly it continues for long periods (over 30 mins). Sample rate 250000 - recording just outside my house from sunset through the night. Any ideas what this might be?
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Just reading some other similar posts and I see it might be to do with SD card writing or batteries? - my card is a SanDisk Ultra 32 GByte and batteries are Energizer rechargeable. Device ID 249BC30461CBBA03 Firmware: 1.8.0