News for hackers. Stuff that matters.

A comment on Cave-Link: Underground text communication system. Parent comment

Re:Cave-Link: Underground text communication system by gnfargbl on Wednesday November 10, 2021 @09:13AM (#29174818)
I can't see these devices specifically mentioned in https://www.ofcom.org.uk/__data/assets/pdf_file/0028/84970/i..., though the frequency range they operate in (20-140kHz) is allowed to be used by induction loop type applications, at a suitably low power.
[ Parent | on HN ]
Re:Cave-Link: Underground text communication system by ale42 on Wednesday November 10, 2021 @09:22AM (#29174896)
... but the cave link uses relatively high power levels (20-30 Watts if I remember correctly)
[ Parent | on HN ]
Re:Cave-Link: Underground text communication system by lazide on Wednesday November 10, 2021 @09:52AM (#29175195)
Inductive stove tops are also In the KW range
[ Parent | on HN ]