2/20/2023 0 Comments Download driver dan tool ch341a![]() ![]() ![]() > You go to and search for "level converter 3.3 to 5". > I have a serial port, but I don't know how to convert the PPS output (0 / 3.3V) to RS232 (-5V / +5V). ![]() > stratum-1 server and offering that as a server on your LAN. > You might find better results using that GPS/PPS with a Raspberry Pi as a > Plus or minus 10.3, try it and see! Not perfect, but better than nothing. > milliseconds (10.3 - IIRC the offsets are in milliseconds but please check). If not, just set the offset of the PPS to ~10.3 > See if your motherboard has a true serial port - perhaps just as a header but > Yes, Thiebaud, USB is not good enough for PPS signals! > But there is still an offset of around 10.3ms, which I think is induced by USB as explained in this article about other chipsets ( August/016078.html) ![]() > The offset induced by the "pulse length" has disappeared. > To do the inversion, I just changed the "Pulse Mode" parameter to "Falling edge" from "Rising edge". The offset "-62.580ms" for the GPS seems normal to me, i guess it's the processing time of the NMEA frames by the U-Blox NEO-6M.īut, I don't understand why my PPS clock has an offset of "+110ms" compared to Internet NTP servers? Remote refid st t when poll reach delay offset jitter I let it run for a while, and this is what I get: Server 127.127.20.14 minpoll 4 maxpoll 4 mode 16 prefer I am using ntp 4.2.8p15 on windows with loopback-ppsapi-provider.dll drivers I soldered pin 3 of the u-blox chip to have the PPS on the DCD/CLK pin of the CH341A. I use a USBTTL adapter (CH341A) connected to a NEO-6M in +5V, RX, TX, GND. I post this message because I have a huge offset (+110ms) on a PPS source compared to NTP internet servers. ![]()
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