The D500X Bat Detector/Recorder Mk I is an ultrasound recording unit intended for long-term, unattended recording of bat calls. In contrast to time expansion bat detectors, the D500X records full-spectrum ultrasound in real time with virtually no gaps between recordings. The recorder is equipped with four slots for CF cards, which typically makes it possible to leave the unit in the field for more than a month. The triggering system allows the device to automatically start recording as a sound is detected.
The recording length can be selected in steps from 0.3 up to 20 seconds. In order not to fill the card too fast at locations with high activity, a minimum time between two recordings can be applied. The recorder is normally operated in a low-power mode with no pre-trigger (i.e. the recording starts as the sound exceeds the chosen threshold level), but both pre-and post-trigger functions are available in the standard (not low-power) mode. The D500X Bat Detector/Recorder Mk I stores the bat calls in time stamped wav files.
The D500X Bat Detector/Recorder Mk I comes in a soft protective case with hooks to hang from a tree.
Specifications D500X Ultrasound Detector/Recorder MK I
| Type: | Direct, high-speed recording |
| Microphone: | Advanced electret, jack for external microphone |
| Frequency range: | 15 – 190 kHz (500 kHz sampling rate, high-pass filter enabled) |
| Connections: | External microphone, external trigger, external DC supply |
| Timer: | Four on/off periods per day |
| Batteries: | 4 x AA size, Alkaline or NiMH recommended |
| External DC supply: | 5.5-8 V, typically ca. 200 mA (average, when recording), depends on CF card type and number of CF cards |
| Size: | 165 x 170 x 53 mm, excl. connectors etc. |
| Weight: | 1.2 kg incl. batteries and front panel cover |
Recording system
| ADC resolution: | 16 bits |
| Anti-aliasing filter: | Yes, 8th order, 190 kHz cut-off frequency |
| Sampling rates: | 44.1, 300, 500 kHz (optimized for 500 kHz) |
| Recording length: | 0.3, 0.5, 1, 2, 3, 5, 10, 20 sec or manual recording |
| Recording medium: | CF card, 4 slots |
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