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richard.c.sewell
Jul 10, 2021
In Device Support
Hi everyone, I have been processing the sonograms of UK bats using Kaleidoscope and have detected the following bats: Common and Soprono pipistrelles, noctules, Leisler's, and serotines. I understand that some bats are louder than others, eg Noctules are loud. If I detect a just-detectable signal from a pipistrelle (say) what is its approximate distance from the Audiomoth. Has anyone got any advice on this or where I could get any information? Many thanks, Richard
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richard.c.sewell
Jun 16, 2021
In Device Support
Hi there, I have been using my audiomoth successfully to record bat calls from sunset to sunrise here in the UK. The audiomoth is configured to record for 15 seconds periods followed by a 5 second pause. All was going well until recently. Visually scanning the wav files using kaleidoscope after a nights recording reveal that the files are getting progressively shorter. Although configured to 15 seconds, last night the first file (at around sunset) recorded for 6 seconds and gradually the periods reducing to zero seconds by about 5 am. The same thing happened the night before, the actual recording period started at 15 seconds (at sunset) but reduced during the night to a recording period of less than a second. Has anybody got any thoughts what the problem might be? I have tried reconfiguring the AM. Perhaps I should re load the firmware? Best wishes, Richard
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richard.c.sewell
May 31, 2021
In Device Support
Hiya, I'm enjoying recording bats with my audiomoths which I've borrowed from my college. I have two AMs one of them is recording fine. The other is producing wav files containing no visible signals. Both have been configured identically and contain the latest firmware. I tested both side by side by switching to default and jangling keys above them. One gave a strong signal, the other nothing. Scanning the forum suggests this may indicate a microphone problem. I don't think the device is currently damp - but am drying it out just to be sure. Any other suggestions? Thanks in advance.
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richard.c.sewell
May 25, 2021
In Device Support
Hi, I have just downloaded the files from my Audiomoth which was set to record overnight. It produced 1600 plus files - most of which are noise - although I did pick up pipistrelle signals in some of them. The Audiomoth was housed in a case I downloaded from the internet and 3D printed (see attached photo). It incorporates an audio vent I bought from China. The weather was rainy. I attach one of the few traces (from kaleidoscope) that actually detected a pipistrelle (see 55 to 90 kHz) but the trace also shows a repetitive background signal at 10 to 20 kHz that is a feature of all files. Any clues what this signal is caused by and how I can avoid in future? Or is it a case of wading through all 1600 files to find the ones that contain bat signals? Should I adjust the amplitude threshold? I read on the forum that sound triggering is being developed presumably for this reason. Many thanks in advance .... (PS - this is the first time I have used an AM and I am new to this bat monitoring lark)
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