2021-01-14, 20:19:43
Thanks John. I just read about Rugby & its replacement at Skelton.
Interesting that the Navy needs megawatts but hams get it done with milliwatts - except for the subsea bit :-)
Going from the ridiculous towards the sublime, several nations have used SLF (30 - 300 Hz) or ELF (3 - 30 Hz), which will penetrate several hundred meters into seawater. The US once had a system operating at 76 Hz but it was decommissioned (google Project Sanguine). According to Wikipedia, China has an ELF facility "the size of new York City" to talk to its subs. India and Russia also use it.
73
Dave, VE3WI
Interesting that the Navy needs megawatts but hams get it done with milliwatts - except for the subsea bit :-)
Going from the ridiculous towards the sublime, several nations have used SLF (30 - 300 Hz) or ELF (3 - 30 Hz), which will penetrate several hundred meters into seawater. The US once had a system operating at 76 Hz but it was decommissioned (google Project Sanguine). According to Wikipedia, China has an ELF facility "the size of new York City" to talk to its subs. India and Russia also use it.
73
Dave, VE3WI