I got into a discussion on Quora about this the other day.
Their FCC filing says they'll use 2000mhz of bandwidth for the Satellite
to User Terminal downlink. However many satellites they have, they'll
be limited to 2000mhz per geographic area. If we generously assume 10
bits/hz then that's 20gbps. That's useful, especially in rural areas,
but it's not enough to replace cable or fiber like some pundits seem to
think
Consider the trouble you can have coordinating channels for 50 or 100
stationary towers. Apply that problem to thousands of moving
satellites. That's a serious engineering problem in and of itself.
Maybe do-able in software, but not easy.
A person in the discussion pointed out that if the satellites are going
to use lasers to communicate with each other then they'll have to keep
adjusting alignment on those lasers constantly. The servo aiming the
laser must apply torque to the satellite which has to be countered by
either propellant or maybe a counter rotating motor on the other side of
the satellite. It wouldn't be a big deal except they're moving
constantly, so that's another big engineering problem.
They also have to manage station keeping and maintenance for 7 times the
number of man-made satellites currently in operation for the whole world.
The potential for better rural internet is nice and all, but if they
really get all of this working it's an engineering feat on par with
building the pyramids.
-Adam
On 5/8/2019 5:09 PM, Bill Prince wrote:
So we are roughly a week away from seeing how quickly this can scale.
https://www.teslarati.com/spacex-schedules-starlink-launch-debut/
bp
<part15sbs{at}gmail{dot}com>
On 4/18/2019 7:42 AM, ch...@wbmfg.com wrote:
Visible antennas
Cost per mbps
Latency
I will keep my head in the sand.
*From:* dave
*Sent:* Thursday, April 18, 2019 8:15 AM
*To:* af@af.afmug.com
*Subject:* Re: [AFMUG] Real threat
LOL... Yep..
On 4/18/19 9:05 AM, Bill Prince wrote:
Well, well, well. Reality may be rearing its ugly head...
https://seekingalpha.com/article/4254917-spacex-backtracking-satellite-internet-puts-future-profits-doubt
bp
<part15sbs{at}gmail{dot}com>
On 4/4/2019 5:21 PM, Ken Hohhof wrote:
Sounds like a job for Space Force.
Actually, I'm a little confused. Will these LEO sats be 5G? What
good are
they if they aren't 5G? How are we going to get remote surgery and
self-driving vehicles without 5G?
I wish these big corporations would make up their minds, do I need
a small
cell 1000 feet away because <reasons>, or do I need thousands of
satellites
whizzing overhead 50 miles up? Seems like polar opposites, but
apparently
we gotta have 'em.
-----Original Message-----
From: AF mailto:af-boun...@af.afmug.com On Behalf Of Robert Andrews
Sent: Thursday, April 4, 2019 7:03 PM
To: af@af.afmug.com
Subject: Re: [AFMUG] Real threat
And one more Indian anti-sat test to turn it all into chaff...
On 04/04/2019 04:34 PM, Bill Prince wrote:
So now in addition to Elon and his thousands of satellites, and
OneWeb
with their thousands of satellites, we will now add Bezos and another
few thousand satellites:
https://www.reuters.com/article/us-amazon-com-broadband/amazon-plans-t
o-launch-over-3000-satellites-to-offer-broadband-internet-idUSKCN1RG1Y
W
bp
<part15sbs{at}gmail{dot}com>
On 3/20/2019 10:30 AM, Ken Hohhof wrote:
Oh, no, Elon will be able to market it to all Tesla owners! And
have
kiosks in all the Tesla stores! We're doomed!
So I guess what I'm saying is technology doesn't sell, marketing
sells, and it all depends on who they partner with to actually sell
service to end customers. Also of course they are not the only
company doing this. OneWeb for example. SpaceX has the
advantage of
having their own launch service and being able to piggyback on other
payloads.
*From:* AF mailto:af-boun...@af.afmug.com *On Behalf Of *Chuck
McCown
*Sent:* Wednesday, March 20, 2019 12:09 PM
*To:* af@af.afmug.com
*Subject:* [AFMUG] Real threat
Or is the sky falling?
https://www.reddit.com/r/Starlink/comments/7zqm2c/starlink_faq/
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