mastodon.social/@camelliakyoto… camelliakyoto@mastodon.social - 🌿BUTTERBUR & NANOHANA💛
Spring is heralded in Japan by many different plants and flowers, but one of the most keenly anticipated is 'fuki' (菜蕗), the 'giant butterbur'.
As soon as the shoots appear, they are plucked from the ground and cooked as a delicacy.
#Kyoto #Japan #菜蕗 #京都 #giantbutterbur
Camellia Tea Ceremony (@camelliakyoto@mastodon.social)
Attached: 1 video 🌿BUTTERBUR & NANOHANA💛 Spring is heralded in Japan by many different plants and flowers, but one of the most keenly anticipated is 'fuki' (菜蕗), the 'giant butterbur'.Mastodon
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Anyone out there know about satellite internet tech? How many geostationary satellites would it take to provide a wireless net connection to every net-enabled device in Aotearoa?
Is a satellite a realistic thing for a forward-looking government to pay for, to guarantee sovereign intra-government communications? Plus emergency comms during natural disasters.
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Roknrol
in reply to Strypey • • •This doesn't exactly answer the question, but it comes close and should give you what you need to determine details.
answers.com/astronomy/What_is_…
What is the minimum number of satellites needed to cover the whole Earth? - Answers
AnswersStrypey
in reply to Roknrol • • •> This doesn't exactly answer the question
I can see two answers, which directly contradict each other, and offer no references. Thanks anyway, but answers.com seems more like noise than signal to me.
Roknrol
in reply to Strypey • • •Sorry...boosted for reach. I'm not a rocketry or satellite guy so I can't give you a better answer...just bits and pieces picked up over the years.
GPS seems to take 31 satellites, according to BBC.
youtube.com/watch?v=IVa-NynMFc…
- YouTube
www.youtube.comStrypey
in reply to Roknrol • • •@roknrol
> boosted for reach
Thanks : )
翠星石
in reply to Strypey • • •I know the basics about radio transmission and well wireless transmission simply doesn't have
the bandwidth for acceptable connection speeds if you have more than ~40 wireless clients/km².
Starlink is one example - it's acceptably fast if there are only a handful of stations in each cell, but as soon as many people start
actually using it, the connection speeds drop substantially.
LTE and 5G use many techniques to increase the possible bandwidth, but as soon as enough people actually start using it in an
area, the speeds drop substantially, even to the point where emergency callls start getting dropped.
There is a lot more bandwidth available in currently unused extremely high frequency bands and lab testing has shown promising
results (although that doesn't necessarily mean practical devices will be possible to manufacture), but due to patents, any working
technology will be unusable until at least 20 years after practical devices are made available.
The atmosphere also tends to aggressively attenuate extremely high frequencies, so I'm
... show moreI know the basics about radio transmission and well wireless transmission simply doesn't have
the bandwidth for acceptable connection speeds if you have more than ~40 wireless clients/km².
Starlink is one example - it's acceptably fast if there are only a handful of stations in each cell, but as soon as many people start
actually using it, the connection speeds drop substantially.
LTE and 5G use many techniques to increase the possible bandwidth, but as soon as enough people actually start using it in an
area, the speeds drop substantially, even to the point where emergency callls start getting dropped.
There is a lot more bandwidth available in currently unused extremely high frequency bands and lab testing has shown promising
results (although that doesn't necessarily mean practical devices will be possible to manufacture), but due to patents, any working
technology will be unusable until at least 20 years after practical devices are made available.
The atmosphere also tends to aggressively attenuate extremely high frequencies, so I'm not sure if such bands will be practical to
use from satellites.
If you want emergency announcements during natural disasters, the most reliable thing would be one big AM tower that can transmit an AM radio signal to the whole country (with maybe text announcements also encoded into the audio stream).
In many natural disasters you're really on your own and should focus on being prepared to handle them, as even if you can make a call for help, that's no good if the emergency services are too overwhelmed to help you.
Instead the fibre internet rollout should continue, as that has enough bandwidth and is quite tolerant of natural disasters if properly installed.
Strypey
in reply to 翠星石 • • •(1/2)
@Suiseiseki
> as soon as enough people actually start using it in an
area, the speeds drop substantially
Is the limit the number of connections, or the level of packet throughput?
> emergency announcements during natural disasters, the most reliable thing would be one big AM tower
We have an AM network, although it's in danger of being defunded 🙄 But that's one way broadcast. I'm interested in 2-way emergency communications, ideally without a SPoF.
Strypey
in reply to Strypey • • •(2/2)
@Suiseiseki
> the fibre internet rollout should continue
Agreed, but the context is mobile communications, not fixed line installations.
翠星石
in reply to Strypey • • •>Is the limit the number of connections, or the level of packet throughput?
It's both.
The greater the number of connections, the more connections the available bandwidth needs to be subdivided between and the more interference mitigations need to be applied (i.e. "delays" between "packets" need to be increased).
One example of the issue of too many clients is how the range of UMTS base stations would reduce the more clients that were connected (although later encoding schemes don't face this exact same limitation).
CDMA is analogous to a room full of pairs of people speaking different languages (with each pair rejecting languages that they don't understand as noise) - if too many pairs keep entering the room, every pair needs to move closer and closer to be able to hear the other.
Strypey
in reply to 翠星石 • • •LisPi
in reply to 翠星石 • • •Another thing that would help is resorting to LiFi.
Short-range high-speed wireless communications backed by fiber and with little to no interference issues unlike LTE, 5G and WiFi.
Obviously this requires a hub architecture and doesn't provide direct-to-device connectivity.
> but due to patents, any working technology will be unusable until at least 20 years after practical devices are made available.
We should get rid of those, they're generally harmful.
Strypey
in reply to LisPi • • •@lispi314
> We should get rid of those, they're generally harmful
Patents? 100%.
@Suiseiseki