Dong, dong, dong, dong, dong...


Perhaps the current Stormscope uses this method; Ryan's original work used a
spot frequency (50 kHz) and amplitude discrimination. And Ryan didn't
"invent" it. The seminal work was done by Smythe Research Associates in San
Diego on a field trip to the South Pacific.

Strikefinder was the first to use multiple frequencies across a rather broad
bandwidth.

Jim



"Dave Butler" wrote in message
news:1132589727.740244@sj-nntpcache-3...
Stubby wrote:

The explanation I got seems better: The atmosphere attenuates some
radio frequencies more than other (I believe high frequencies are
attenuated more than low, but it may be way more complex.) A lighting
flash is an impulse and thus, has all frequencies present at the same
level. The distance sensor can measure the level of 2 frequencies and
derive the distance. In practice I've heard that 6 frequencies are used
but that implies 36 amplitude ratios are being used.

Ding ding ding ding ding ding! Finally someone responded with the correct
answer.

Dave