SDR RSP1A for Bat detection !
Using a small piezo speaker direct on rf antenna cable i was able to pick up the sounds of Bats. 40-55 Khz The sound track contains the actual recording and slowed down versions made with Audacity. Trying this with a relative short cable (normal sat rf) of about 8 meters. When trying with longer cable of 30 meters i was unable to record the Bat sounds (also did not see any though) So probably need to add in that case an amplifier. But my initial successful experiment contains no other parts then the the cable and the Piezo buzzer. (red to the core and black to the shielding of the cable) Let me know if you need more information or would need more detailed video.
Using a small piezo speaker direct on rf antenna cable i was able to pick up the sounds of Bats. 40-55 Khz The sound track contains the actual recording and slowed down versions made with Audacity. Trying this with a relative short cable (normal sat rf) of about 8 meters. When trying with longer cable of 30 meters i was unable to record the Bat sounds (also did not see any though) So probably need to add in that case an amplifier. But my initial successful experiment contains no other parts then the the cable and the Piezo buzzer. (red to the core and black to the shielding of the cable) Let me know if you need more information or would need more detailed video.