Hi Roelof, VLF,
Yes, we (and others) arrived there on 137kHz and above. But it is so hard to belive that this is optimal even in the 33km band. Maybe the optimum C is not a function of the frequency, if discussing an optimal SNR.
But you know i am rather a practical instead of a theoretical OM ;-) Therefore i asked if someone has checked this before on VLF. I also know the equivalent circuit of that probe and the FET input, out of Rs and Cs but anyway ;-)
With a stronger input signal and same SNR there could be a benefit to unsensitive receivers as well (as you mentioned) as long as the input stage is not overdriven...
Paul, have you a website where your RX equipment is shown? The antenna and it's environment, cables and so on? Maybe the preamt with the LT1028 and so on?
73, Stefan
