From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cirse-smtp-out.extra.cea.fr (cirse-smtp-out.extra.cea.fr [132.167.192.148]) (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 EB21F3CB37 for ; Thu, 16 Nov 2023 14:45:11 -0500 (EST) Received: from pisaure.intra.cea.fr (pisaure.intra.cea.fr [132.166.88.21]) by cirse-sys.extra.cea.fr (8.14.7/8.14.7/CEAnet-Internet-out-4.0) with ESMTP id 3AGJjAD3025932 for ; Thu, 16 Nov 2023 20:45:10 +0100 Received: from pisaure.intra.cea.fr (localhost [127.0.0.1]) by localhost (Postfix) with SMTP id 499B02062A8 for ; Thu, 16 Nov 2023 20:45:10 +0100 (CET) Received: from muguet2-smtp-out.intra.cea.fr (muguet2-smtp-out.intra.cea.fr [132.166.192.13]) by pisaure.intra.cea.fr (Postfix) with ESMTP id 428C220615D for ; Thu, 16 Nov 2023 20:45:10 +0100 (CET) Received: from [10.11.240.42] ([10.11.240.42]) by muguet2-sys.intra.cea.fr (8.14.7/8.14.7/CEAnet-Internet-out-4.0) with ESMTP id 3AGJjAVT020497 for ; Thu, 16 Nov 2023 20:45:10 +0100 Message-ID: Date: Thu, 16 Nov 2023 20:45:10 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: fr To: starlink@lists.bufferbloat.net References: From: Alexandre Petrescu In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-CEA-Virus: SOPHOS_SAVI_ERROR_OLD_VIRUS_DATA Subject: Re: [Starlink] Starlink filings for D-Band via 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: Thu, 16 Nov 2023 19:45:12 -0000 Hi, David Sorry, I've mistaken twitter for reddit. The link is reddit.  It is https://www.reddit.com/r/spacex/comments/175ttvz/spacex_files_29988satellite_wband_network_using/ The person is 'spacerfirstclass' (_if_ it is a person, I dont know). Referring to the ITU orbit filing he says (emphasis his): > This is exactly the same as Starlink Gen2 orbits filed with FCC, so *I > don't think this is a new constellation, this is just SpaceX adding G > band gateway connection to the existing Gen2 constellation*, and for > some reason they don't want to go through FCC to do this. Alex Le 16/11/2023 à 18:29, David Fernández via Starlink a écrit : > Hi Alex, > > "A person on twitter seems to be saying this filing is precisely the > filing that spacex did at FCC" > > Would you mind linking to that tweet, if it is public? > > Thank you. > > Regards, > > David > > >> Date: Thu, 16 Nov 2023 14:27:03 +0100 >> From: Alexandre Petrescu >> To: starlink@lists.bufferbloat.net >> Subject: Re: [Starlink] Starlink filings for D-Band via Tonga >> Message-ID: <805d52ce-b517-49b9-a053-8306cd20b8aa@gmail.com> >> Content-Type: text/plain; charset=UTF-8; format=flowed >> >> Towards clarification, >> >> The .mdb file of the ITU filing can be read with Excel (tab Data -> >> leftmost button 'Access'). The .mdb is on the web page of the ITU >> filing, at the bottom of the page. >> https://www.itu.int/ITU-R/space/asreceived/Publication/DisplayPublication/53068 >> >> It might be that this 'ESIAFI II' is just a name because of some reason. >> >> There are some interesting dates like '06/03/2023', '13/03/2023' and >> '20/03/2023' and '6/10/2023'. >> >> There is much data about orbits, powers, beams that I dont know how to >> interpret. I would need the precise description of the database format, >> but I dont know where to get it from. >> >> The frequencies are listed, as I interpret these fields: 123 GHz - 130 >> GHz centered on 126.5 GHz, 158.5-164 c 161.25 and 167-174.5 c 170.75. >> >> About D-band: I am not sure what is precisely a 'D band' and I think >> that discussion about bands is very complicated. I know there is >> wikipedia page about it, yes. >> >> A person on twitter seems to be saying this filing is precisely the >> filing that spacex did at FCC; but comparing the numbers shows some >> differences: total sats per plane differ at some altitudes like at 525km >> altitude: ITU says 3600 sats whereas FCC says 3360 sats. There can be >> speculations as to why they differ as there can be errors of various >> people including myself. >> >> The person on twitter tells that ITU filing is in this table, but I dont >> know how he generated it. Not sure whether he made some syntax error. >> >>> Altitude (km) Inclination (degrees) Satellites per Plane Planes >>> Total Satellites >>> 340 53 110 48 5280 >>> 345 46 110 48 5280 >>> 350 38 110 48 5280 >>> 360 96.9 120 30 3600 >>> 525 53 120 28 3600 [nota by me: FCC says 3360 and not 3600, see >>> table below] >>> 530 43 120 28 3600 >>> 535 33 120 28 3600 >>> 604 148 12 12 144 >>> 614 115.7 18 18 324 >>> >> I found this earlier FCC document has this table at this URL >> https://docs.fcc.gov/public/attachments/FCC-22-91A1.pdf (not sure >> whether it is the most authoritative, but at least the mathematics >> 28*120 at altitude 525 does make sense to be 3360). >> >>> Altitude (km) Inclination (degrees) Orbital Planes sats/plane Total sats >>> >>> 340 53 48 110 5280 >>> >>> 345 46 48 110 5280 >>> >>> 350 38 48 110 5280 >>> >>> 360 96.9 30 120 3600 >>> >>> 525 53 28 120 3360 [nota by me: >>> 28*120 == 3360 indeed] >>> >>> 530 43 28 120 3360 >>> >>> 535 33 28 120 3360 >>> >>> 604 148 12 12 144 >>> >>> 614 115.7 18 18 324 >>> >> Alex >> >> >> Le 16/11/2023 à 10:30, Alexandre Petrescu via Starlink a écrit : >>> Le 15/11/2023 à 16:48, David Fernández via Starlink a écrit : >>>> I have got news about the recent filing by Starlink for the use of >>>> frequencies in D-band: >>>> https://www.itu.int/ITU-R/space/asreceived/Publication/DisplayPublication/53068 >>>> >>>> >>>> This has been done via Tonga, not the USA, and is for both, uplink and >>>> downlink frequencies, although only downlink seems to be allocated now >>>> for satellite use. >>> Thanks for the pointer. >>> >>> It is the first time I hear about this 'ESIAFI II' constellation. I >>> understand it is a different thing than the starlink existing >>> constellation. >>> >>> It adds to the list of plans of LEO Internet constellations (starlink, >>> kuiper, oneweb etc.) >>> >>> Alex >>> >>>> Regards, >>>> >>>> David > _______________________________________________ > Starlink mailing list > Starlink@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/starlink