It turned out that conneting a S meter did not reduce sensitivity at all. All it did was change the audio mute voltage of the squelch.
Unfortunately the fieldstrength output is unable to provide enough current for the S meter.
I need to make a buffer. Maybe I can change the buffer of the squelch circuit.
The problem with the spike noisse that causes unmute of the audio has been solved. A 100 nF capacitor between fieldstrength output and ground did the trick.
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