ARLA/CLUSTER: Tecnologia desenvolvida por radioamadores usada nas grutas da Tailandia

[João Costa > CT1FBF]

Ham radio technology used in Thailand cave rescue

UK radio amateur *John Hey G3TDZ* (SK) designed the special low frequency
radio equipment, the *Heyphone*, used in the recent cave rescue in Thailand

On Facebook *Phil Karn KA9Q* posted:







*Naturally I got interested in the technical aspects of the cave rescue in
Thailand, particularly communications. They used the "Heyphone", a voice
radio designed by a UK radio ham, John Hey, G3TDZ, as open-source hardware
specifically for cave rescues. It uses upper (single) sideband voice on 87
kilohertz in the VLF (very low frequency) band. (That's what it says -- 87
kHz is actually LF).The "antenna" consists of two stakes driven into the
ground about 20m apart. Enough of the current between them fringes outward
to couple to another antenna up to a few hundred meters away (or down).John
Hey passed away in 2016 so he didn't get to see his work used here. But ham
radio should get some of the credit.*

Phil Karn KA9Q
https://facebook.com/phil.karn.98/posts/10155276627256486
https://twitter.com/ka9q

John Hey G3TDZ Heyphone Cave Rescue Communication System
http://bcra.org.uk/creg/heyphone/

Al Williams WD5GNR has written an article on Hackaday about the cave
equipment
https://hackaday.com/2018/07/11/ham-designed-gear-used-in-thailand-cave-rescue/
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