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We have a Pettersson D240X, but it is picking up lots of road noise, I am trying to record bats on rocky cliffs next to a busy road. For noisy roadways, do we need another full spectrum detector?
The D240x does have a gain setting and trigger level setting, but it really was made for manual recording. If you are doing 1 night surveys then a Windows 10 device (such as a Surface Pro 4) running SonoBatLIVE https://batmanagement.com/products/sonobatlive connected to the Pettersson M500 microphone https://batmanagement.com/collections/pettersson-collection/products/pettersson-m500-microphone A huge advantage of this system is that it records -only- bat calls for the most part, thanks to a sophisticated noise rejection program. The second advantage is that if some care is done at the start of the session entering a field note and filename start, there is virtually no post processing that needs done and you can go straight to manually reviewing the bat calls of special interest. A disadvantage of this system is that while we are working on a passive solution, at the moment the only available solution runs of the Windows tablet, so you have to power it. If you need to leave the detector for a week or two at a time, the Pettersson D500x would be a good choice. It’s noise rejection system can be set to minimize the number of noise files but will not be as sophisticated as the SonoBatLIVE; so it will still record some noise files that will need removed using automated software such as the SonoBat Data Wizard during post processing. However, the D500x records constantly, unlike the D240x which must suspend for ~17 seconds, etc. so bats would not be “missed” like they potentially might be with the D240 in auto mode. The D500x can also be used manually if that’s what you're used to doing with the D240x, except there is no downtime between recordings and no realistic limit to file length.