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I think the laser aiming is the least of the problem areas. The
satellites will be in a more or less constant position relative to
each other and there are probably non-mechanical ways to aim
lasers.
I, for one, will be impressed to see how many the "dozens" they
plan to launch next week actually turn out to be. I would be
impressed if it's just 24, but my impression would go up for each
additional dozen. Could be as many as 60 for this launch.
bp
<part15sbs{at}gmail{dot}com>
On 5/9/2019 1:56 PM, Adam Moffett
wrote:
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>
Visible antennas
Cost per mbps
Latency
I will keep my head in the sand.
Sent: Thursday, April 18, 2019 8:15 AM
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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