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December 4, 2016 at 10:26 pm #3819
uRADMonitor
Keymaster

This oscillation is not normal.

I looked over the data and can advise you the following:
https://raw.githubusercontent.com/radhoo/uradmonitor_kit1/master/pcb/1.2.105/circuit/kit1_105_sch.png

1. change the compensation capacitor (C9)
2. change the geiger tube