10
5. Supplement
Technical specifications
Microphone-frequency range
The graph shows the sensitivity of the built-in ultrasound microphone in the range of
interest for bat calls. Maximum sensitivity is around 50 kHz.
The maximum sensitivity of the elektret-microphones normally used in more simple
detectors is from15 to 20 kHz.
Frequency response of the pre-amplifier
The pre-amplifier is optimised for the amplification of ultrasound signals over 15 kHz.
Background noise, that could lead to overmodulation of the sensitive pre-amplifier will
be masked out.
Summary of Contents for BAT 2
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