Although the Zoom F3 field recorder is not primarily designed to record ultrasound, the specification is such that the unit can actually create high quality ultrasonic recordings, when fitted with a suitable ultrasonic microphone.
The intention here is to record and monitor the ultrasonic echo-location calls of bats. The 32 bit float format of the F3 is ideally suited to that task, as the bat calls have a notoriously unpredictable dynamic range.
As most ultrasonic bat calls are beyond the range of human hearing, it is also useful to be able to audibly monitor what is being recorded - in real time .... A frequency shifting 'heterodyne' style bat detector can perform that task.
Click on the appropriate image below to view details of simple 'add on' hobby projects for both an 'Ultrasonic Microphone' and a 'Heterodyne Monitor' - as well as 'System Set-Up' details.
