skip distance  ??

Bob K3DJC


On Thu, 26 Apr 2007 05:27:36 -0800 "Laurence KL1X"
<[email protected]> writes:
> What ho - we are down in Singapore apartment hunting (no way can we 
> afford a 
> house here by the looks of it....)
> 
> Ive thrown out the LF probe out of the hotel balcony - into the 
> SDRIQ, and 
> its a cut of a thousand lightning strokes...can barely hear Loran 
> this 
> evening.
> 
> Its been poor weather here for the past few days so little chance of 
> dx.
> 
> Any one done any short studies of lightning emfs' at different 
> freqs? - Ive 
> read a few saying most/some of the power is at VLF, stroke 
> source/target, 
> length and angle dependant, but Im definately seeing a cut at around 
> >400Khz 
> - below this the noise rises to be pretty flat but above 400Khz its 
> 
> amplitude is generally many dbs/octave down - this just due to 
> propagational 
> modes?
> Doesnt seem to matter day or night too much - perhaps my probe has 
> some 
> issues, but I see the same on most antennae....
> 
> Cheers
> Laurence
> Singapore, rainy, stormy....
> 
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