(2014-06-07, 10:07)Benedict.Smith Wrote:

(2014-06-07, 07:42)halder Wrote: I am still waiting for an explanation of the noise of an E field antenna and why the signal first gets divided by 10 and than multiplied up to 1000 times.
What is the origin of the noise?

thanks in advance
halder

The noise is all around, both man made (transmitters, motors, refrigerators, computers, car ignitions, etc)
And natural (distant thunderstorms, static buildup, earthquakes, volcanic action, solar radiation etc).
This is why the probe must be as remote from strong noise sources as possible, and also why the signal is attenuated first, we are only interested in the relatively strong signal from lightning, even after attenuation the noise is still much greater than the noise produced by the op-amp.
Ben.