From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.lang.hm (unknown [66.167.227.145]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 9599B3CB37 for ; Wed, 31 Aug 2022 06:06:42 -0400 (EDT) Received: from dlang-mobile (unknown [10.2.2.70]) by mail.lang.hm (Postfix) with ESMTP id 5F9991457ED; Wed, 31 Aug 2022 03:06:41 -0700 (PDT) Date: Wed, 31 Aug 2022 03:06:41 -0700 (PDT) From: David Lang To: Mike Puchol cc: starlink@lists.bufferbloat.net In-Reply-To: Message-ID: References: <1661878433.14064713@apps.rackspace.com> <6p5n9262-3745-pq31-5636-1rnon987o255@ynat.uz> <20220830220710.GA2653@sunf10.rd.bbc.co.uk> <15982a40-2b34-7ed1-bfa3-bced03fc3839@auckland.ac.nz> <9CE05D69-FC37-4C97-9D8D-D46B2DF6DE16@gmx.de> <2321be3b-957f-2d1f-c335-119c8e76efe5@auckland.ac.nz> <8978587-42op-q175-2o41-qq9p4491459s@ynat.uz> MIME-Version: 1.0 Content-Type: multipart/mixed; BOUNDARY="===============3024002547041945618==" Subject: Re: [Starlink] Starlink "beam spread" 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: Wed, 31 Aug 2022 10:06:42 -0000 This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --===============3024002547041945618== Content-Type: text/plain; format=flowed; charset=UTF-8 Content-Transfer-Encoding: 8BIT I was actually referring to the possibility that the home dishy could point at different satellites, so you could have multiple satellites pointing at a given cell on the same frequency, and the dishy can aim it's beam to pick which one to hear as well as which one to transmit to. David Lang On Wed, 31 Aug 2022, Mike Puchol via Starlink wrote: > On this particular one, the gateway beams are extremely narrow, around 1.5º to 2.5º. SpaceX is working on “mega-gateways” where 32 antennas will co-exist. They are also deploying a new gateway design with a larger antenna, and thus narrower beamwidth and more gain, allowing for a considerable reduction in TX power. > > Best, > > Mike > On Aug 31, 2022, 09:33 +0200, David Lang via Starlink , wrote: >> On Wed, 31 Aug 2022, Ulrich Speidel via Starlink wrote: >> >>> This combines with the uncomfortable truth >>> that an RF "beam" from a satellite isn't as selective as a laser beam, >>> so the options for frequency re-use from orbit aren't anywhere near as >>> good as from a mobile base station across the road: Any beam pointed at >>> you can be heard for many miles around and therefore no other user can >>> re-use that frequency (with the same burst slot etc.). >> >> not quite, you are forgetting that the antennas on the ground are also steerable >> arrays and so they can focus their 'receiving beam' at different satellites. >> This is less efficient than a transmitting beam as the satellites you aren't >> 'pointed' at will increase your noise floor, but it does allow the same >> frequency to be used for multiple satellites into the same area at the same >> time. >> >> David Lang >> _______________________________________________ >> Starlink mailing list >> Starlink@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/starlink > --===============3024002547041945618== Content-Type: text/plain; CHARSET=utf-8 Content-Transfer-Encoding: BASE64 Content-ID: Content-Description: Content-Disposition: INLINE X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KU3Rhcmxpbmsg bWFpbGluZyBsaXN0ClN0YXJsaW5rQGxpc3RzLmJ1ZmZlcmJsb2F0Lm5ldApodHRwczovL2xpc3Rz LmJ1ZmZlcmJsb2F0Lm5ldC9saXN0aW5mby9zdGFybGluawo= --===============3024002547041945618==--