Stormscope

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

Just for clarity, using multiple frequencies is not the key to its
working. A pair (2) will suffice. Using multiple frequency (ratios)
will probably increase the accuracy, however.

Hats off to whoever invented it. Very clever.



RST Engineering wrote:
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

Stubby wrote:

Just for clarity, using multiple frequencies is not the key to its
working. A pair (2) will suffice. Using multiple frequency (ratios)
will probably increase the accuracy, however.

Hats off to whoever invented it. Very clever.

God invented it. I don't remember who first discovered it, but
dispersion as a phenomena has been known for quite some time.

Matt