From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from rellim.com (rellim.com [IPv6:2001:470:e815::19]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id A0BE63B2A4 for ; Mon, 14 Jun 2021 15:07:06 -0400 (EDT) Received: from spidey.rellim.com (rellim.com [IPv6:2001:470:e815::19]) by rellim.com (Postfix) with ESMTPSA id D7B4A20084B for ; Mon, 14 Jun 2021 12:07:05 -0700 (PDT) Date: Mon, 14 Jun 2021 12:07:05 -0700 From: "Gary E. Miller" To: starlink@lists.bufferbloat.net Message-ID: <20210614120705.31634f9a@spidey.rellim.com> In-Reply-To: References: Organization: Rellim X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: multipart/signed; boundary="Sig_/KJQz.Ekl=1sS.VXmf/tcswe"; protocol="application/pgp-signature"; micalg=pgp-sha512 Subject: Re: [Starlink] GPS Dongle? 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, 14 Jun 2021 19:07:06 -0000 --Sig_/KJQz.Ekl=1sS.VXmf/tcswe Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Yo Nathan! On Mon, 14 Jun 2021 10:40:36 -0700 Nathan Owens wrote: > Sorry, it was MACx-1, but either way, I decided to go for an Adafruit > Raspberry Pi GPS "Hat", which does 1PPS. I do not recommend that HAT. There are much better ones available at similar prices. =20 > I'll setup a raspberry pi > with RT_PREEMPT RT_PREEMPT is overkill. The best you can get on a RasPi is about 54ns accuracy. Due to the clock granularity of 54ns. > and run as a Stratum-1 Clock locally. But always have other chimers in your configuration file. > This should > help with better irtt timings. This can be done for <$100 if anyone > else wants super accurate time. For some definition of "super". > > Does anyone know if any MAC1-X GPS dongles or anything similar are > > available anywhere? They pop up now and then. Right now GPS parts are hard to find, much less at good prices. Search for Navisys GR-601W, GR-701W, or GR-801W. The "W" suffix says it outputs PPS. The MAC1-X, or any PPS over USB, will only get you to > 1 milli second because of the USB. RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 gem@rellim.com Tel:+1 541 382 8588 Veritas liberabit vos. -- Quid est veritas? "If you can't measure it, you can't improve it." - Lord Kelvin --Sig_/KJQz.Ekl=1sS.VXmf/tcswe Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIzBAEBCgAdFiEEDImNR/2vUKZZKLG0LmvF3i7oaj4FAmDHqNkACgkQLmvF3i7o aj6FnA//Vg7bXr0VhxpWCKWhKf5rsSrYktWzk9dg4ZiL5GN/45S1bP7QKfRyHDYf 3Qw/AQ3CUftKFChCgFo08tKdmBUqqxZRjjEZMutSjUAEB9xqI/XNc+5YHuLTlLj5 sGM/76UDLUMaSZM+XPDIi7enKvLpglxuvCThtRAQ8NmjCIg2m1vuOxQlrwcPzzjM Nslcpa+6WaFBtdv8KhVZTWY/eNmIOVNkBDfhlEg9yLd9FpBRhTATCKCxzGrpucSi X0gD2JQ2/hEBf/yivHfoocXFej3BJ4/GabJnxKR1J1GRm/lFzIe12f9VSkSb2/Fs ntJVHAS/h5XIDnT3KYoAsZ+osze5TaCLdCIB3xoK4tsctatL0fODITPdmCta8oqi 8fl1waaXiGQGxDIavzbq8d7LDS/HuysQe+oW7qZeH911/DjpZngOA7ieN30aHyMm DjS15CtjYTgOb+9iz8yBY0W00c8M3hknrEEu/avILMGSfo9Gentt/EOkSLX0SFv3 VgPRBxtgbNAEQKS5WGCEUufOeLyemg6MEoq18kxlvoUVXPjwnu28MU2sZR5//UnZ zJasTCMoTJtuo7/ACZPq28zDb/24slwPU1KbBtWZTR6L+tSFwmWNPAgHl+uGhUl0 YUVM8uId8N3Us8gRK7jrUYSxRo2hpGByPbRvA8P2IQ2qgAOLIOE= =kazf -----END PGP SIGNATURE----- --Sig_/KJQz.Ekl=1sS.VXmf/tcswe--