I am using an LND712 with an 8.5 meters long RG6 coaxial cable. The anode resistor is exact near to GM tube at the other end of cable. I have used compensation capacitor as well.
The system works and gives no issues but as soon as I touch the cable with my hands, spurious counts appear. Why such noise gets introduced just by touching. Using a long cable has been a problem with my project. Any ideas in why the problem on how to solve it ??? Is it due to cable capacitance ? Or any other reasons ?