Date: Fri, 29 Nov 2019 16:28:00 +1100 From: Peter Jeremy <peter@rulingia.com> To: Ross Alexander <rwa@athabascau.ca> Cc: James Shuriff <james@opentech.cc>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: rpi3 clock drift Message-ID: <20191129052800.GA37113@server.rulingia.com> In-Reply-To: <alpine.BSF.2.21.99999.352.1911272214050.28592@autopsy.pc.athabascau.ca> References: <alpine.BSF.2.21.99999.352.1911271039470.281@autopsy.pc.athabascau.ca> <MWHPR06MB3134EC22EC3148DA800B2B7DAA440@MWHPR06MB3134.namprd06.prod.outlook.com> <alpine.BSF.2.21.99999.352.1911272214050.28592@autopsy.pc.athabascau.ca>
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--bg08WKrSYDhXBjb5 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2019-Nov-27 22:20:50 -0700, Ross Alexander <rwa@athabascau.ca> wrote: >An Adafruit "ultimate gps hat" (typical commercial hyperbole, sigh.) >It's about $65 after you add the 40 pin molex connector, the >micro-whatever to SMA cable, and the external amplified patch antenna. You can get a uBlox 7 or 8 module with a patch antenna and PPS output for O($10). It should be possible to wire the serial data to the PL011 UART and preserve the serial console UART but you'd to write a driver. >You can get along without those last two if your Pi is outside, but >I'm in a metal roofed building which the little patch antenna built >into the hat proper finds impenetrable. An external antenna out on >top of the roof makes all the difference. I have a metal roof and find putting the GPS module with a patch antenna near a window (or even near an external wall) is sufficient. --=20 Peter Jeremy --bg08WKrSYDhXBjb5 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE7rKYbDBnHnTmXCJ+FqWXoOSiCzQFAl3grFtfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEVF QjI5ODZDMzA2NzFFNzRFNjVDMjI3RTE2QTU5N0EwRTRBMjBCMzQACgkQFqWXoOSi CzToIg//WSfdyHfRMJBuDBYHYWmMqwhySX2i3OhtOap7Fiw7hJo0P6wBb9Ufowe7 ppXSV/7o8g15HlB9t6rlUOFhrt2rBGOoETBRpGaBGaLSQvKxz6dDyyzmaQZWxmGY F5ScC9guT4O+34MKfkhLh6dJgGFKb7GPwzJDiRxNRN4Ni4jsNU25efvVhx18nCMk O6x9QuL8PKbDdwjr1ABDfyvBPf/5lyIaHm0EH9dkmD+av/5/6gQmVCul0ejHMRnF mH/vG9Kvtkpc0pDzQiYkXqZFts6xQNxAookFRE+q2wEU7YKabXKr/zPoVVS6iTKy QtpHxLfhUeMrxNuOwIHxA85UyZwJYiIMlieyjT3/M7/8bhFRW1SytQqd7jGIP/dK LcKXZ9ZeIvdUGCiOXxY0PG+bmurBhi4BongXKcEOOZuIOruY01T0Aq1Ffzrz+0/L QecwdIqQzftGNpzHVsV1nR6Y+OEHVXzV0OqadrG4ldR8sRrXySz12oSaebZMa10t 5b3k4DH0Vb8whd0wzkMUdWJS+Bl7v66vJDJ+7GRSojSP5jlVUH0Ii8mR+ArBjYzP 9VuixQqx1sKPn34N8B6s7o29gOeb5HvKHvP506ZozkA3ew/KhteEAJpbWEsFolE5 Bntv3EBGVL2FY8J4FrImA+sXbNp/FhAf8vVhpcsroy3N/c6fyrM= =m8E/ -----END PGP SIGNATURE----- --bg08WKrSYDhXBjb5--
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