Re: [AFMUG] OT: Now there are ~~ 180

Thu, 30 Jan 2020 13:14:17 -0800

The only thing I saw was that the initial 60 had no inter-sat link whatever, and that the ones following that had something different, but not the optical. I could easily be fantasizing it, but something between nothing and optical is some kind of RF. Perhaps they are using an unlicensed band? That might be safe enough in LEO.


bp
<part15sbs{at}gmail{dot}com>
On 1/30/2020 12:40 PM, Carl Peterson wrote:
If they had RF inter satellite links there would be a license for that and I haven't seen one.  Could have missed it.  Anyone see anything?

On Thu, Jan 30, 2020 at 2:16 PM <ch...@wbmfg.com> wrote:
I believe they are using lasers derived from shark eyes.  Those work better in space. 
 
Sent: Thursday, January 30, 2020 12:49 PM
Subject: Re: [AFMUG] OT: Now there are ~~ 180
 
Speed of light in glass varies but it’s about 80% of vacuum.   Density matters!   Or is it matter makes density?  If your dense does it matter?   If you're not matter does that give you energy?
 
Mark

On Jan 30, 2020, at 2:45 PM, Bill Prince <part15...@gmail.com> wrote:
 

I think he means bandwidth as opposed to "speed". Surely latency would be almost indistinguishable. However, there could be a lot of difference in the bandwidth. Regardless of the sat-to-sat speed, the downlink/uplink will still be the gating factor.

bp
<part15sbs{at}gmail{dot}com>
On 1/30/2020 11:40 AM, ch...@wbmfg.com wrote:
In a vacuum it should be the same. 
 
Sent: Thursday, January 30, 2020 12:36 PM
Subject: Re: [AFMUG] OT: Now there are ~~ 180
 
What's the difference in speed between the laser and RF links?
 
On Thu, Jan 30, 2020 at 10:40 AM Bill Prince <part15...@gmail.com> wrote:

Not what I read. The early sats (the ones other than the first 60) do not have the laser communications between them, but they do have an RF link between them. They are functional.


 
bp
<part15sbs{at}gmail{dot}com>
On 1/29/2020 7:56 PM, Ryan Ray wrote:
The sats that are up there now also are not equipped to communicate with each other. There is no inner satellite communication. Everything has to come down to ground stations right now.
 
On Wed, Jan 29, 2020 at 12:08 PM Bill Prince <part15...@gmail.com> wrote:

SpaceX got another 60 Starlink sats into orbit this morning. That brings
the functional constellation to 180 sats. The first batch of 60 don't
count since they are not equipped to communicate with each other.
Various reports say either 300 or 400 sats are required to get a basic
minimal functioning system. At the rate they're going, this may mean
they will have achieved their goal in another couple of months (they
want to do 2 launches per month).

https://www.space.com/spacex-starlink-3-satellites-launch-rocket-landing-success.html

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bp
<part15sbs{at}gmail{dot}com>


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