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Pettersson D240X bat detector

Pettersson D240X bat detector

Very popular heterodyne and time expansion detector with backlit, large digit, accurate digital display, showing the tuned frequency in the heterodyne mode. The frequency and volume controls are on the side of the case, making it easy to adjust. Using stereo headphones, the heterodyne signal is heard on the left channel and the time expansion signal on the right channel. When the built-in speaker is used, a switch is used to select the heterodyne or time expansion signal.

A digital recorder can be connected to the D240X to record the time expanded calls for analysis on a PC. If the recorder has a “voice activated” recording mode, a fully automatic bat recording system is obtained, which can be left in the field for unattended recording of bat calls.


Additional information

Weight170 g
Dimensions119 × 60 × 25 mm

Heterodyne and time expansion (x10 or x20 – selectable via switch)


Advanced electret

Frequency range

10-120 kHz (min.)

Display accuracy

± 0.15 kHz


8 kHz (+/- 4 kHz), -6 dB


1 x IEC 6LF22 (9V)

Quiescent current

30 mA typ. (replay) including LCD backlight

Comment switch


Memory size

1M x 8

Sampling frequency

307 kHz


8 bits

Storage time

3.4, 1.7 or 0.1 sec. (selectable via switch)

Trigger modes

Manual, level – broadband, level – narrowband


50% of the selected storage time


2 x 3.5 mm jacks for headphones and tape recorder


Overload indicator, adjustable input gain, replay of signal in memory through heterodyne system

    VAT Included
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