Hi - I've been using my Audiomoth for several weeks now and I'm recording nocturnal bird migration over my house. Normally, my track gets split during midnight and continues the second half directly after, despite the configuration app says it will produce just one file. Since a couple of days, my Audiomoth stops at midnight and doesn't continue with the second half of the recording. Any idea what's wrong? Thank you in advance!
1) Does the AM have a resonance, or excess gain at 20kHz? I tried a dozen indoor/outdoor settings, and there is always a band at 20kHz. The spectrum below is inside a quiet room. 2) In most of the indoor, quiet room, recordings, I see a rising thin line in the 30-50kHz range, see the above spectrum, the five panels cover about 20 minutes. Could this be a form of self-noise? 3) The clicking noise, I saw on other posts that this is SD card writing? I only see this occasionally. The image below was from inside a parked car at night - very quiet. Is the suggestion still to get the "Extreme" version of the SD card? Thanks - I love the unit. Keep up the good work - you are making a lot of research possible.