24 ms·
I remember going through a tunnel in a shinkansen at around 300kph and doing a speed test as I was surprised to still have full 4g signal. It was faster than t
by koyote 6y ago
I remember going through a tunnel in a shinkansen at around 300kph and doing a speed test as I was surprised to still have full 4g signal.
It was faster than the max speed I'd ever recorded back in London.
Meanwhile when I was living in the US I had to put my phone next to the window to receive ANY signal at all. This was on a university campus.
I would love to know how Japan built their system (was it publicly funded/subsidised?).
- tsjq 6y agoPerhaps the Japanese telcos did not scam away a 100-200 Billion dollars of taxpayer money, and instead put it to good use.
- eythian 6y agoI'm not sure if it's the same thing in Japan, but how they get signal in the metro in Amsterdam is interesting. Effectively it's coax cable running along the tunnel with holes in the shielding to let the signal leak out. Article (in Dutch): https://tweakers.net/nieuws/141195/mobiel-netwerk-met-leaky-cables-in-amsterdamse-noord-zuidlijn-gaat-live.html https://tweakers.net/nieuws/141195/mobiel-netwerk-met-leaky-...
- ChrisMarshallNY 6y agoMight be. I don't know. I'm told that the Japanese system is a form of GSM that is fairly weak, so there is a need for very many repeaters.
- fomine3 6y agoLooks like same. It uses Leaky Coaxial Cable. (japanese) https://k-tai.watch.impress.co.jp/docs/news/592635.html https://k-tai.watch.impress.co.jp/docs/news/592635.html (photo for just cable) https://k-tai.watch.impress.co.jp/img/ktw/docs/592/635/html/me13.jpg.html https://k-tai.watch.impress.co.jp/img/ktw/docs/592/635/html/...