Don't know but have you tried one of these DIY detectors?
http://www.techlib.com/electronics/lightning.html
I'm going to build one.
Why not just go with the full Blitzortung setup, and contribute your data as well?????
http://www.blitzortung.org/Webpages/index.php?lang=en&page=3
Um, I already do. Stations #668 and #706. I have both a 6.8USB "Green" system (668) and a RED (706).
I would like to see if this is AS3935-based to compare it with the AS3935 interfaced to my system RED.
Greg