From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mo4-p00-ob.smtp.rzone.de (mo4-p00-ob.smtp.rzone.de [85.215.255.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 3133F3B2A4 for ; Mon, 7 Feb 2022 14:05:40 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1644260738; s=strato-dkim-0002; d=vdr.net; h=In-Reply-To:From:References:To:Subject:Date:Message-ID:Cc:Date:From: Subject:Sender; bh=1wWkgq7i/3zVUklGiMVscC3qViKJx0NgCpmEcRmC0vs=; b=Ffs0HIBEmmCuN6mzh6j1VNggq3G6J1aT4qAXa9xcgAsR45cFo+Nzu/9ZGGz6b4UP6W TllmrxXausq7h5t751YcDDCkOd2FjiCIhqGL/RBDrd1UB8/7+FvjIxSq3AT+JqgTs7Fn RHbvbHenmTe32sXKvK4s9ehJDQSViPncEU+zTGRwQYwPrnx/n8T2hdNUKcpO4u8P1ZcE UEaFviw+NjEM5le4P9tYPofxE0jSoMkC5IOrDgG6AzbsRTWbepLcbt576YpkdqKNYcLJ P+sfTX37oH13wik263f2aN2OOgS5AtFM67n4yJ4sEl9v1sjdG0Axb1WKnvlodOxgaaUR aDaw== Authentication-Results: strato.com; dkim=none X-RZG-AUTH: ":L3oAZ2C+f+0rWOBO0o0FCt0K/NLK22L9vRfsowfGeUwZvHoRQNb8RvCxA7TzeczJfxmt3HM8ezobjuXZQeCEIkTkGhj7lw==" X-RZG-CLASS-ID: mo00 Received: from [IPV6:2a01:c22:c8d4:4d00:118:a860:c356:c8a6] by smtp.strato.de (RZmta 47.39.0 AUTH) with ESMTPSA id Yf0366y17J5cSa3 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate) for ; Mon, 7 Feb 2022 20:05:38 +0100 (CET) Content-Type: multipart/alternative; boundary="------------SXlFPJJY3G99vj3JNO1i1U7s" Message-ID: <0d78acc3-1101-c7d2-c7a6-53158b8c1045@vdr.net> Date: Mon, 7 Feb 2022 20:05:38 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.5.1 Content-Language: en-GB To: starlink@lists.bufferbloat.net References: From: Christian von der Ropp In-Reply-To: Subject: Re: [Starlink] Starlink for Tonga? X-BeenThere: starlink@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: "Starlink has bufferbloat. Bad." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 07 Feb 2022 19:05:40 -0000 This is a multi-part message in MIME format. --------------SXlFPJJY3G99vj3JNO1i1U7s Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit But in practice the satellites won't be sitting and waiting at the edge of this 940km radius. They are moving in and out the radius and the question is if satellite density is high enough so that once the serving satellite loses its gateway link there's another satellite in the 940km radius which also covers Tonga. And then this new satellite cannot be within certain elevation angles (~60-80° at 0° azimuth) where the geostationary arc crosses Fijian skies and the gateway antennas have to seize emission. My gut feeling is that availability in Tonga would be <90% simply because it's too far out at the edge of a Fijian gateway's range where there will be frequent service interruptions. Am 07.02.2022 um 19:51 schrieb Nathan Owens: > The current coverage radius of a gateway/ground station with a 25 > degree minimum elevation is ~940km, so nothing in theory. > > On Mon, Feb 7, 2022 at 10:50 AM Daniel AJ Sokolov > wrote: > > Hello, > > I hope this is not offtopic: Starlink wants to build a ground > station on > Fiji to supply Tonga with internet. > > The distance between Tonga and Fiji is about 750 km minimum. That's > quite the distance. > > What does Starlink have to do to make this work? > > Cheers > Daniel > _______________________________________________ > Starlink mailing list > Starlink@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/starlink > > > _______________________________________________ > Starlink mailing list > Starlink@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/starlink --------------SXlFPJJY3G99vj3JNO1i1U7s Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit
But in practice the satellites won't be sitting and waiting at the edge of this 940km radius. They are moving in and out the radius and the question is if satellite density is high enough so that once the serving satellite loses its gateway link there's another satellite in the 940km radius which also covers Tonga. And then this new satellite cannot be within certain elevation angles (~60-80° at 0° azimuth) where the geostationary arc crosses Fijian skies and the gateway antennas have to seize emission. My gut feeling is that availability in Tonga would be <90% simply because it's too far out at the edge of a Fijian gateway's range where there will be frequent service interruptions.


Am 07.02.2022 um 19:51 schrieb Nathan Owens:
The current coverage radius of a gateway/ground station with a 25 degree minimum elevation is ~940km, so nothing in theory.

On Mon, Feb 7, 2022 at 10:50 AM Daniel AJ Sokolov <daniel@sokolov.eu.org> wrote:
Hello,

I hope this is not offtopic: Starlink wants to build a ground station on
Fiji to supply Tonga with internet.

The distance between Tonga and Fiji is about 750 km minimum. That's
quite the distance.

What does Starlink have to do to make this work?

Cheers
Daniel
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