I am using a Audiomoth dev + GPS Board which needs to specify the configuration via a txt-file instead of the app. The application note (https://github.com/OpenAcousticDevices/Application-Notes/blob/master/Using_AudioMoth_GPS_Sync_to_Make_Synchronised_Recordings/Using_AudioMoth_GPS_Sync_to_Make_Synchronised_Recordings.pdf) explains the settings well but it seems that it is not possible to specify sleep cycles. Within each recording period the device is permanently recording. I know it would be possible to specify multiple recording periods with start and end but the number of periods is limited to only 10 periods per day. I´d like to specify sleep/wakeup cycles within recording periods or alternatively specify an unlimited number of recording periods (or let´s say at least 100 instead of 10 recording periods). I´d appreciate any advice to solve the issue. Thanks in advance.

When being in the Advanced TAB of the configuration tool there is a checkbox called: Enable Low Gain Range. What exactly happens when this box is checked? I have searched the manual, but can't find a definite explanation. From some comparitive measurements it looks as if the overall gain is reduced by 12 dB. Can someone here confirm this or correct me otherwise, please? A second question relates to the Frequency Trigger Type under Filtering. When selecting this option I can set the threshold only as a percentage. The other two options (dB and linear value) are not available in this case. They are when using the Amplitude Triggering method. Is this intentional or a bug? If intentional, why are the other two methods not available? Some clarfication would be much appreciated.

Hi! My team and I are working on a research project on marine bioacoustics. We are using Hydromoths both in an aquarium and deploying them at sea. The one we deployed at sea was left for one month and a half. When we retrieved it we saw that the green and red lights were flashing, indicating some kind of recording failure. We checked it and indeed only 10 days had been recorded properly (15min every hour); the 11th day did not record properly producing files of only a couple of minutes; and from there on, there were empty files for the following days. The ones we used in the aquarium (2 devices) were left to record for 24 hours nonstop, generating 24 files of 1 hour each, and we had no problems for 2 complete days. However, the third day that we set it to record, they both showed an error flashing the red and green lights as well. We saw that no files had been recorded properly on any of the devices, either only recording some minutes or just recording empty files. The SD cards are all Samsung 256G, they are not full and still work when connected to the computer. For the one we deployed at sea we tried changing the batteries only (still showed an error) and the SD card only (still showed and error) and then both things and it finally worked. Based on both cases, we concluded that either the device is not reading well the SD cards or the SD cards produce a recording error after some time. Why would the device when using Samsung SD Cards produce this error? Any ideas how we could solve this problem?