I wonder, is 22,400 miles measured from the center of the earth or the surface?
From: Bill Prince
Sent: Friday, February 26, 2021 7:53 AM
To: [email protected]
Subject: Re: [AFMUG] Your Own Satellite Internet
Orbital velocity at geo is only about 6,800 MPH (versus ~~ 17K MPH at lower
orbits levels), so to inflict maximum damage, you want to launch into geo
counter-clockwise, or anti-geo to put it another way. Then make the satellite a
hardened shell so as to inflict the most damage and have a possibility of
hitting more than one working satellite.
Just thinking of a plot line for a Bond film...
bp
<part15sbs{at}gmail{dot}com>On 2/25/2021 6:20 PM, Robert wrote:
Way below geo orbit, and creating debris in geo orbit would be all those
operators up there idea of a disaster nightmare. I imagine a great James Bond
plot story would be Spectre putting something up there and threatening to ruin
that orbit for a ransom.
On 2/25/21 5:50 PM, Brian Webster wrote:
Well the US Navy proved they can enforce the parking rules back in 2008. To
quote Sheldon Cooper, “You’re in my spot”
https://www.youtube.com/watch?v=6fuv72VM9q8
Thank you,
Brian Webster
www.wirelessmapping.com
From: AF [mailto:[email protected]] On Behalf Of Steve Jones
Sent: Thursday, February 25, 2021 7:47 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] Your Own Satellite Internet
maybe they wrap your bird with tin foil like a space boot
On Thu, Feb 25, 2021 at 6:28 PM Jason McKemie
<[email protected]> wrote:
And where's the tow truck if you just take a spot?
On Thursday, February 25, 2021, Steve Jones <[email protected]>
wrote:
So if a nation is not recognized by the UN then they have free parking?
On Thu, Feb 25, 2021, 5:52 PM Mark Radabaugh <[email protected]> wrote:
ITU controls the slots:
https://alexsli.com/thespacebar/2017/7/the-international-telecommunications-union-orbital-satellite-parking-enforcement
Mark
On Feb 25, 2021, at 6:02 PM, Steve Jones <[email protected]>
wrote:
Who controls the parking spots? And what if you just decide to put one
there? I'd like to have Elon dough where I could just get in a parking spot
fight in space for spite. I wonder if alec Baldwin is the enforcer, he just
punches you in the face if you take a spot.
On Thu, Feb 25, 2021, 4:30 PM Brian Webster <[email protected]>
wrote:
Matt,
Looking at your post on Facebook, I think you have
misunderstood the Geostationary definition. There is only one orbit height that
rotates around the earth at the same speed as the Earth rotates and it is
located at the equator. That is called the Clarke Belt and it is 22,236 miles
above the earth. Your question about a Leo and it being Geostationary are
contradictions in terms. In the Clarke belt since it’s just one line of
“parking spots” around the earth (at the equator only), one does not just set
up their own. They are very coveted spots in the belt and only the expensive
birds reside there. At 22,236 miles above the earth, a Cambium radio or similar
device won’t have enough power to reach back to a CPE. In addition to that and
you will have high latency just like the current geostationary satellite
systems do. That radio signal has to travel 44,472 miles, hence the latency
people complain about.
https://en.wikipedia.org/wiki/Geostationary_orbit
Thank you,
Brian Webster
www.wirelessmapping.com
From: AF [mailto:[email protected]] On Behalf Of Robert
Sent: Thursday, February 25, 2021 4:31 PM
To: [email protected]
Subject: Re: [AFMUG] Your Own Satellite Internet
Yes, Look up the various "xxxxStats" that have been tethered at the
borders over the years with balloons for radar coverage of low flying aircraft
and the NOTAMS that are posted for them. They have a very large ( relatively )
exclusion zone and you have to worry about said tethers falling and doing
damage on the way down.
On 2/25/21 11:39 AM, Jason McKemie wrote:
Those tethers would be a nightmare for aviation.
On Thu, Feb 25, 2021 at 1:31 PM Brian Webster
<[email protected]> wrote:
One also has to calculate the window that your satellite is
visible on the ground of your target service area based on the altitude you
will have the bird orbiting. Many times any of the Amateur radio satellites
only have a 10 or 15 minute window of visibility a few times a day. For 24/7
internet service you need to have many orbital object/satellites such that when
one move out of view another is there for the handoff. The lower orbit you
have, the smaller window you have. So a LEO small footprint coverage is still
going to take a lot of satellites just to cover you small territory. How many
all depends on the area and altitude. Since your satellite is not going to be
in a stationary orbit, I am sure you need international cooperation to file for
all the orbits you need to just cover your small footprint in the US because
that orbit goes all the way around the earth and has effect on others who might
need a similar orbit. A good portion of the time your satellite is flying
through the sky for your local footprint, it’s not going to be doing much of
anything because it’s not visible to any of your customers. Until we get some
sort of tethered satellite solution that is tied to the ground and centrifugal
force hold the satellite in place, these are the laws of physics one has to
contend with. If someone can invest a very lightweight tethering string of some
sort that when it is long enough the total weight of said string does not
overcome the amount of centrifugal force achieved at your desired height to
allow the radio/satellite to stay in place without needing to be an orbital
object. If that is invested and it also allows for transmission of adequate
power and data, that could be a real game changer. As far as I know 90,000 feet
of something to be a good tether weighs more than the force that could keep the
device flung out that far.
Error! Filename not specified.
Here is an animated version of this graphic
https://commons.wikimedia.org/wiki/File:Iridium_Coverage_Animation.gif
If you want to get an idea of satellite visibilities and the
number of times per day you can view it, this program is a great satellite
prediction and tracking program http://gpredict.oz9aec.net/
Error! Filename not specified.
Here is a short video that does a decent job of illustrating the
complexity of orbital mechanics one has to consider. Earth rotation, orbit
direction, power consideration if you want to be sun synchronous etc.
https://www.youtube.com/watch?v=omv38sEBxk8&feature=emb_logo
Thank you,
Brian Webster
www.wirelessmapping.com
From: AF [mailto:[email protected]] On Behalf Of Carl
Peterson
Sent: Thursday, February 25, 2021 1:43 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] Your Own Satellite Internet
As Adam points out, your satellite isn't just going to float
there. It needs a lot of speed. That speed would have it moving "past" you
really really fast until you got to about 26k miles up where it would remain
still relative to you. If you wanted it to float at 90k' you would need a
balloon or something like that but that's a loony idea.
On Thu, Feb 25, 2021 at 12:34 PM Adam Moffett
<[email protected]> wrote:
I know a guy I could ask.
On 2/25/2021 1:20 PM, Steve Jones wrote:
can you get hot pockets on jail commissaries?
On Thu, Feb 25, 2021 at 12:08 PM Adam Moffett
<[email protected]> wrote:
well....Aiming at thousand foot tower from close range
customers we are definitely sometimes more than 3 degrees up. Put me in jail I
guess.
On 2/25/2021 1:02 PM, Matt Hopkins wrote:
If I recall correctly it is illegal to aim a 5GHz radio >
3° above the horizon.
On Thu, Feb 25, 2021 at 9:43 AM Matt Hoppes
<[email protected]> wrote:
So here me out. I've been to low earth orbit
(90,000 feet) with
equipment I can get in my basement/hardware store.
I've beamed signals
back from 90,000 feet to a radio in my truck.
I'm familiar with how AmSats work (although have not
sent one up myself).
What is preventing a WISP from putting together a solar
powered GeoSync
satellite that has a few Cambium Spots on it to fully
cover your
coverage area?
Yes, you'd have capacity issues if you didn't plan it
correctly, but is
there technically any reason I can't run a 5GHz link to
a satellite?
Do you have to pay a "rental" fee to occupy a space in
space to park
your bird?
Yes, I realize there would be latency, but if you keep
the throughput
there (something Hughes Doesn't Do), the experience
wouldn't be half bad
for most things..
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