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Use Audiomoth with an external hydrophone

Is this hydrophone H2d Hydrophone (aquarianaudio.com ) compatible with Audiomoth v 1.2.0?

60 comments

60 Comments

Apr 05

Hi, now I am on it again! Please refer to my previous comments, where I describe how I try to adapt the AM 1.2.0 to a piezo ceramic hydrophone input. This time I have replaced the 12k resistor between audio in and GND with a 2k7, to increase the "swing range". I have a another hydrophone preamp than the Aquarian PA4, (now similar to the Etec A1001 (www.etec.dk), adding 50dB, between the hydrophone and the AM. I recorded a pinger in a small test tank, with the pinger resting on the bottom, ca 80 cm below the AM which was held close to the surface. The pinger main frequency is 70kHz, so I tested both 250kS/S and 384 kS/S. In both cases there were gaps in the recording, more with 384 (top image) than with 250. The AM settings were Low in the low gain range, and high pass filter 50kHz.

What can be the cause of this? And what to do about it?

Thanks in advance for any advice!

mats

Mats Amundin

Apr 06

Replying to

Hi, and thanks for this super-fast reply!! 👍 I do use Sandisk Extreme, and if I remember right this has not been a problem before I changed to the new premap - and the 2k7 resistor. I tried out the Live app, but it does not allow me to change sample rate to 384kS/s, neither changing the gain. I updated the softwares, including the config, and now I cannot set the config either... I can change all the different settings, but not do the final config. I also restarted my laptop, just for the sake of it :-) but it didn't change anything. What can I dot?