What is the ERP of the 11.9 kHz Alpha transmission? I've recently greatly improved my night time reception of the Alpha signals. Your recent post stated a 1 db per 1000 km difference between day and
I'm inclined to agree. The ERP is low and should only be a problem to a research station near to a tx, which could be dealt with on individual cases. I should think the lightning locator networks wou
In order to squeeze out the maximum S/N, it looks like a loop antenna is desirable in order to null as much background noise as possible. It must 'see' down to the natural VLF background, so a basic
For me, the power levels for this long DX are getting worryingly high as they will at some point start to cause interference to research activity. [...] a few years ago i asked people doing geophysi
Paul, LF, So, if we have the approx formula for VLF propagation and know the range of the noise floor at 8,97kHz, then what would be the TX power i have to apply to a 300m vertical to reach Canada/US
Stefan schrieb: Well, to extrapolate so far from a single data point would be very silly. But silly can be fun, so .... Given B = sqrt( 9.5e-21 * ERP/r) * exp( -r/a) where a = 2.9e6 for daytime path,
Paul, parameter 'a' may be essentually larger if signal propagated over salt water. It depends on deposit of ionosphere and ground to attenuation. Thus nice theoretical problem arises. We can rather
