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trengriffin's profile
Tren Griffin
Tren Griffin
Tren Griffin
@trengriffin

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Tren Griffin

@trengriffin

I work for Microsoft. Previously I was a partner at Eagle River, a private equity firm established by Craig McCaw. I am on the board of directors of Kymeta.

Seattle, Washington
25iq.com
Joined February 2009

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    Tren Griffin‏ @trengriffin 24 Jan 2021

    This is an interesting picture of 143 different devices that SpaceX launched this morning as part of its SmallSat Rideshare Program. You can see the Starcraft satellites efficiently stacked at the bottom and then on top a range of other devices with various shapes and sizes.pic.twitter.com/8jcIWril28

    9:08 AM - 24 Jan 2021
    • 21 Retweets
    • 105 Likes
    • Sina Motamedi Jon Kiehnau Himaloy ig: @PerciPics🐍🇯🇲 J-5⚡️ David Jones Dan Calle Rashmi Ola Vea 😸🏴‍☠️
    2 replies 21 retweets 105 likes
      1. New conversation
      2. Tren Griffin‏ @trengriffin 24 Jan 2021

        The SpaceX Falcon 9 ride-share "included 48 Earth imaging satellites dubbed SuperDoves from Planet, 17 tiny communications satellites for Toronto-based Kepler, and 30 small satellites for the US and Europe packaged by Berlin, Germany-based Exolaunch."https://news.google.com/articles/CAIiEJJLwWTG7RLFCAN7xKbIqt4qFggEKg4IACoGCAow3O8nMMqOBjD38Ak?hl=en-US&gl=US&ceid=US%3Aen …

        1 reply 3 retweets 16 likes
        Show this thread
      3. Tren Griffin‏ @trengriffin 24 Jan 2021

        These Starlinks are the first launched into a polar orbit enabling coverage further north, including in polar regions. Delivered to Sun-synchronous orbit of 550 km inclined 97.59 degrees to the equator. Polar orbit missions typically go from Vandenberg, but this one was Florida.

        1 reply 1 retweet 7 likes
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      4. Tren Griffin‏ @trengriffin 24 Jan 2021

        4/ The maneuver that the Falcon 9 pulls off to land is still cray. Note that the need for fuel to land means there's less payload going up but with 3 or more launches of the same reusable parts, the economics are better says Musk. Small payloads cost more per kilogram (eg $15k).pic.twitter.com/TjS5Ulsrm9

        2 replies 2 retweets 17 likes
        Show this thread
      5. Tren Griffin‏ @trengriffin 24 Jan 2021

        5/ A satellite must be able to talk to a gateway in Earth to enable real time communication. Over the polar regions gateways are hard to build so inter-satellite links enable a daisy chain to a gateway. These aren't laser links to ground terminals, but instead between satellites.pic.twitter.com/E6o3qiPEAN

        1 reply 1 retweet 11 likes
        Show this thread
      6. Tren Griffin‏ @trengriffin 24 Jan 2021

        6/ The Starlink gateway in Alaska was confirmation some satellites would be in polar orbit. The shortest path to ground based fiber is usually to get polar traffic to that gateway via inter satellite links. Each link creates incremental latency due to on board processing.pic.twitter.com/ip1gMvycdV

        1 reply 2 retweets 14 likes
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      7. Tren Griffin‏ @trengriffin 24 Jan 2021

        7/ Why not put optical inter-satellite links (OISLs) on the non polar orbit constellation? Its cheaper to leave them off, creates less failure risk and conserves power to use a ground gateway. Will ocean coverage make OISls valuable at some point? Sure. https://www.spaceintelreport.com/spacex-starlink-inter-satellite-links-useful-not-essential-regulatory-deployment-deadlines-not-a-problem/ …pic.twitter.com/NzpRYCX2wL

        2 replies 0 retweets 2 likes
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      8. Tren Griffin‏ @trengriffin 24 Jan 2021

        8/ If a particular inter-satellite link fails there is the option of the Alaska gateway or to build more polar gateways. By putting those 10 satellites in that new polar obit at that altitude SpaceX/Starlink has "licked the cookie." They now "have dibs" on the altitude/orbit.

        1 reply 0 retweets 4 likes
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      9. Tren Griffin‏ @trengriffin 24 Jan 2021

        9/ Here's confirmation of my thesis. I win a participation trophy.pic.twitter.com/jnYKkf88ec

        1 reply 0 retweets 9 likes
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      10. End of conversation
      1. New conversation
      2. Tony Mels‏ @tmels 24 Jan 2021
        Replying to @trengriffin

        I saw this video last week which talked about the latencies of global fiber vs satellite lasers. Because of the vacuum in space the lasers are faster than fiber.https://youtu.be/m05abdGSOxY 

        1 reply 0 retweets 2 likes
      3. Tren Griffin‏ @trengriffin 24 Jan 2021
        Replying to @tmels

        Signals travel about 31% slower in fiber optic networks than in free space. But both have distance and processing delays. Doing a ping on Iridium is about 450ms. Every node has a process delay. Fiber has vastly more bandwidth but isn't mobile. Everything is a tradeoff.

        1 reply 0 retweets 5 likes
      4. Show replies

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