Pettersson D230

Available, usually ships in 1-2 business days The Pettersson D230 is a combination  heterodyne (HET) and frequency division (FD) detector for real-time active monitoring. Using stereo headphones, you can constantly monitor the bat's full frequency range in FD in your right ear. The HET output is also constantly being played in your left ear. When a bat arrives, quickly tune the HET into the strongest signal. The frequency on the display will be where the bat's is calling the loudest, and is a huge step towards identification. In fact, with some context as to where you are recording and what species are expected in the area, it is possible to narrow down the possible candidates.  This quality bat detector features a large, accurate, backlit digital LCD displaying the center of the tuned frequency in kHz. The HET detector in real time plays any ultrasound that is approximately 4 kHz above and below the tuned frequency. This method works by frequency subtraction and only a very narrow par