From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com [IPv6:2607:f8b0:4864:20::42b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 5BF9A3B29D for ; Fri, 12 May 2023 00:22:45 -0400 (EDT) Received: by mail-pf1-x42b.google.com with SMTP id d2e1a72fcca58-64a9335a8e7so2912751b3a.0 for ; Thu, 11 May 2023 21:22:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ieee.org; s=google; t=1683865364; x=1686457364; h=references:to:cc:in-reply-to:date:subject:mime-version:message-id :from:from:to:cc:subject:date:message-id:reply-to; bh=H9P9Bc+VNE4Ppn+uUoD3tskYYpY6Pu3I2lbwfIbAxT8=; b=c941l8XTsTrXlN5jxOK2f82eslyivZ83Ert0hyT9txgiqV+n+4yObPMAa5fRbZdrNq BhmfAQSiB52d7qcx1x9PvWqM2t/OtNt2BmCuB3WdOmTFr/OxFF4rqnr8BVPfZ0raPnV/ PEH906gQS7DqBS4s6/n3pLqqTW8Ha1L69xGWU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683865364; x=1686457364; h=references:to:cc:in-reply-to:date:subject:mime-version:message-id :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=H9P9Bc+VNE4Ppn+uUoD3tskYYpY6Pu3I2lbwfIbAxT8=; b=NolnDY0BcY7CygcYxJ/tj+2TLSzwfpwKdRVJVtJG6h97ux/wFdiSMiGZYNp74iEjCY 5RDjPiWw/MoITmE6N/aSh4Oo51Fmf4GCX2gUAadrnfLODrW8I8Awf0KrHLpXsbOcSLtD 7Yd1Dzf1p2wJYUNGJ2N00fxRQEImZxdYTdZmRxgno1W+v1MaRhvCcjC495gVv2JUXoLr qaNduIzXgKPpx19A1FsteCU4kOKIkJrkAiKLsyiIWQ4MsfZadUVCXiBiRx3If+30K70u ul8BK6O1TJQpSzJFnswJV9qAhVs2MfUE8XAB8srkjpRZioqpa2muNKUAQambbOkwtunR RpMw== X-Gm-Message-State: AC+VfDxhT3DKuzkzfUwvvW091bhL7M4L+S9PRULTD01oe8UZ3NAj/0E2 BrQF96j/688/dcixWl6k2U4ZeQ== X-Google-Smtp-Source: ACHHUZ7HfmAtvhe5SdTyXl8swLv+6l3KLzlDeI3ZDBqNb7CxavMh/eJ3JkEx5mOqQEIjsMwgCahtZA== X-Received: by 2002:a05:6a20:3d09:b0:f0:93d9:9c03 with SMTP id y9-20020a056a203d0900b000f093d99c03mr29043899pzi.15.1683865364120; Thu, 11 May 2023 21:22:44 -0700 (PDT) Received: from smtpclient.apple (dhcp-72-253-196-65.hawaiiantel.net. [72.253.196.65]) by smtp.gmail.com with ESMTPSA id u12-20020aa7848c000000b0063f00898245sm6286435pfn.146.2023.05.11.21.22.43 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 11 May 2023 21:22:43 -0700 (PDT) From: Eugene Y Chang Message-Id: Content-Type: multipart/signed; boundary="Apple-Mail=_A066045D-B2F2-471A-BBAB-CAD27A477A21"; protocol="application/pgp-signature"; micalg=pgp-sha256 Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3696.120.41.1.3\)) Date: Thu, 11 May 2023 18:22:41 -1000 In-Reply-To: <75e8f43a-5ac2-6ddf-4fb6-da2f6366e7c8@olegkutkov.me> To: Oleg Kutkov , Sirapop Theeranantachai , Dave Taht via Starlink References: <75e8f43a-5ac2-6ddf-4fb6-da2f6366e7c8@olegkutkov.me> X-Mailer: Apple Mail (2.3696.120.41.1.3) Subject: Re: [Starlink] Quick questions about Starlink user terminal 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: Fri, 12 May 2023 04:22:45 -0000 --Apple-Mail=_A066045D-B2F2-471A-BBAB-CAD27A477A21 Content-Type: multipart/alternative; boundary="Apple-Mail=_CCDE0617-E106-48DF-B58B-5FE0C6517092" --Apple-Mail=_CCDE0617-E106-48DF-B58B-5FE0C6517092 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Usually it is deliberate that equipment does not transmit while = receiving. This is to prevent the transmit power from overloading the = receiver. This problem can be avoided if the TX and RX are on widely = separated freaquencies and antenna configurations to keep the TX signal = out of the RX signal path. What do we know about Starlink=E2=80=99s use of laser links for = satellite-to-satellite communications? I am most curious about the = challenges of pointing the laser at a moving target. Gene ---------------------------------------------- Eugene Chang eugene.chang@ieee.org o 781-799-0233 > On May 11, 2023, at 12:18 PM, Oleg Kutkov via Starlink = wrote: >=20 > On 5/12/23 01:12, Sirapop Theeranantachai wrote: >=20 >> Just a confirmation, HP terminal can work with two satellites at the = same time, one for only TX, and the other for only RX. Is this statement = still correct? >=20 >=20 > Correct. It's a hardware limitation. A switch inside connects antenna = elements to transmitter or receiver chains. > Plus, each Dishy can do TX only in specified time slots. TX slots = depend on the allowed duty cycle and are defined by a global scheduler. >=20 > -- > Best regards, > Oleg Kutkov >=20 > _______________________________________________ > Starlink mailing list > Starlink@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/starlink --Apple-Mail=_CCDE0617-E106-48DF-B58B-5FE0C6517092 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Usually it is deliberate that equipment does not transmit = while receiving. This is to prevent the transmit power from overloading = the receiver. This problem can be avoided if the TX and RX are on widely = separated freaquencies and antenna configurations to keep the TX signal = out of the RX signal path.

What do we know about Starlink=E2=80=99s use of laser links = for satellite-to-satellite communications? I am most curious about the = challenges of pointing the laser at a moving target.
Gene
-------------------------------------------= ---
Eugene Chang
eugene.chang@ieee.org
o 781-799-0233




On May 11, 2023, at 12:18 PM, Oleg Kutkov via Starlink <starlink@lists.bufferbloat.net> wrote:

On = 5/12/23 01:12, Sirapop Theeranantachai wrote:

Just a confirmation, HP = terminal can work with two satellites at the same time, one for only TX, = and the other for only RX. Is this statement still correct?


Correct. It's a = hardware limitation. A switch inside connects antenna elements to = transmitter or receiver chains.
Plus, each Dishy can do TX = only in specified time slots. TX slots depend on the allowed duty cycle = and are defined by a global scheduler.

-- =
Best regards,
Oleg Kutkov

_______________________________________________
Starlink mailing list
Starlink@lists.bufferbloat.net
https://lists.bufferbloat.net/listinfo/starlink

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