Rain, and accessory in box questions
I just bought my first AudioMoth, along with the weatherproof case. A couple of questions:
included in the box was a small plastic envelope containing two small round items - what are these for? Looks like maybe to replace the case opening cover when <what> happens?
I'm recording NFCs so am placing the AM flat facing upwards. What does this mean if it rains overnight? I'm thinking the cone around the mic hole will fill with water. Should I put it in a ziplock bag if rain is expected, and if so how will that affect sound pickup?
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Inside the plastic ziplock bag are two spare Gore GAW334 acoustic membranes. The membranes may need replacing over the lifetime of the case, depending on the deployment environment. For example, some insects and birds can potentially pierce the membrane surface over time. The installed membrane can be inspected by holding an open case up to a light source, if there are any pin holes of light passing through the membrane it will need swapping out.
If the case is placed facing upwards rain water will pool inside the cone, the AudioMoth IPX7 Case is designed to be deployed with the microphone facing horizontally. Placing it inside a ziplock bag should prevent this. There's a good discussion on using ziplock bags here and comparisons of how recording quality is affected here.