Apologies if a thread already exists -- I can't find it. I have next to zero experience recording bats, but would like to do so in parallel with some nocturnal flight call monitoring I am doing in eastern Canada. I'm looking for experience from users with threshold settings for recording bats. I used the suggested settings from the white paper (referenced on github) last night -- 50kHz high pass filter and threshold at '512'. Several bats were indeed recorded, but lots of other stuff (mostly apparent silence) that totaled 3GB (and so most of the night was actually recorded, in only three files).
I have access to a bunch of devices, so I'll set them all up with different thresholds tonight to see what happens, but I thought it would be useful for people to share their experiences with these settings, in different environments/locations. Any insight/pointers would be very welcome.
That's surprising. Here in California I use a 20kHz high filter with 512 threshold and it does a pretty good job of not recording bat-less periods. I record in periods of 595 seconds with 5 second breaks so it's easy to throw away bad recordings. I always end up with a lot of data but fortunately that's because there were lots of bats.