Bat detector

I am using Gmail and I am experiences the same. I got one or two replies after I had reacted and the last from Paul and Defragster never reached me ... Unfortunate.
 
The notifications from the forum somehow do not always seems to reach us. Maybe the forum doen not always realize we are offline or something or does think a notification was already sent out. It will not sent a message every time. If it sent out a message and new reply's come no new notifications are sent out.
I did get a notification last Wednesday.

On the echometer touch part of the noise you get could come come form the attached device so if the SNR on that device does not seen all that great try another phone or tablet. I have seen some nice recordings form EMT as wel as from the Teensy based bat detector I don't think it makes a huge difference but I never compared signal to noise ratio's on any other device.

Why is signal to noise important? As long as it is possible to determine the species a recording is good enough. I also use Batlogger M for transects here as the organisation for those transects use these. In Batexplorer the recordings look great, opening them in Audacity these look hideous they have a very high noise level dut still the species can be determinerd quite well.

Just for fun I attached a contrast measurement of one of my daily garden recordings. I also measured the background noise of one of the batlogger recordings which is already -28dB, I do not like the look of those recordings but they can still be used quite well.

1760888562060.png
 
AFAIK, the figures cannot be compared. Mic SNR is the difference between the mic noise and the max sound level over the total audio bandwidth and finally A-weighted. SNR in the Echometer touch datasheet is given in db/sqrt(Hz) for a given frequency band or the difference between recorder self noise and sensitivity for a given frequency band. For example, you can see in the 2nd lower plot, that SNR at 120kHz is quite low, about 30dB.

The special feature of your bat logger M is, that the bat loggers have far too high gain in the preamps, so that recordings contain lot of noise and nearby passes of bats commonly overdrive the recorder.

So, it is probably quite complex to answer the seemingly simple question of a comparison of SNR of different bat recorders.
 
I have some problems with the teensybat. One of my the encoders lately has an erratic behaviour.

What kind of encoder is used?
How many Impulses and how many stops?

Just want to source the right one to replace.

Steffen
 
It is indeed one of the most common encoders with switch. Please check the soldering first. The GND pin (middle) needs some extra heat. There are thermal reliefs but stil the heat is conducted away in the surrounding copper. Sometimes this results in a bad solder joint. These encoders somehow do not always seem to turn in the same direction (seems to depend on brand). The software allows to swap direction but only fot the pair. Maybe you better have one extra or be able te swat the leads. The encoder is the 20mm version with "plum" rod. There are different lengths and also D-style axles. (20mm probably is measured from the housing, measured form the board these are 26mm long).
 
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