Hi! With an analysis of bat recordings using Kaleidoscope Pro, one particular species seems to show low frequency calls. I get a lot of social calls from the Nyctalus noctula (the research was conducted in the Netherlands), but the lowest band seems to be rather low for bat species (around 8-9kHz where they should be +- 15kHz). Do any of you have an explanation for this? I have attached a few examples of the NYCNOC calls, they are one of the more common species, so I get a lot of similar calls. I figured it might be other sounds (like birds) parallel to the bat call that cause the low band, but as you can see in the images of the spectrogram and considering the fact that the same thing is happening in tens or hundreds of calls, I'd say that is unlikely. Cheers! Koen

Hi, I am doing fieldwork with a few AudioMoths but unfortunately there is an issue with my recordings. It seems that after a few minutes or sometimes even after one minute the recording stops and the files show that the time switched to 1 January 1980. I have just changed the batteries, I get four flashes so that shouldn’t be the issue. The sd cards are empty so that can’t be it either. Any ideas? Thanks! Koen

Hi! I am trying out some different settings with the AudioMoth configuration app to see the most suitable setup for recording bat species. After the device is configurated, I play sounds running from 1-100kHz over a speaker to test whether the device picks it up. Afterwards, I uploaded the WAV files to ARBIMON, to visualize the high frequency sounds. I have attached my configuration and the spectrogram, as you can see, tones up until +- 16kHz are depicted, but tones with higher frequencies are not. Do you have any ideas on what is going wrong? Does it have something to do with my configuration, or maybe it has something to do with the tones I am playing? Or my speaker? I do not have any experience with this type of research, so any additional advice or comments are more than welcome! Thanks in advance! Koen