Put me down for one. --- Graham ke9h.graham (at) gmail.com On Mon, Apr 26, 2021 at 2:51 PM James Perkins <[email protected]> wrote:
> Interested in 1 for comparison with my existing setups. > > I have an adafruit ultimate GPS hat, a Deegoo GT-7U GPS module board, and > I've been interfacing these with Raspberry Pi 4B and AVNET's MaaXBoard > IMX8M to compare responsiveness, using gpsd and chrony. The Pi claims very > stable operation, RMS Offset ~1us, Skew ~0.030 ppm. The MaaXBoard, even > with identical GPS attached, runs with ~90us RMS Offset, Skew ~4.7 ppm. I'm > suspecting the MaaXBoard's sampling of the PPS GPIO is low-frequency, > interrupt latency is large, its system clock is low resolution, or it is in > some sort of idle deep sleep mode that takes it a long time to recover > from, but I'm going to need to look into it more deeply, and that's why the > oscilloscope just arrived. I'd like the MaaXBoard to work because of the > IMX8's IEEE 1588 PTPv2 Ethernet MAC, but there are alternatives in this > price range like Atmel SAMA5D3. > > Cheers, > James > > On Mon, Apr 26, 2021 at 9:57 AM John Miller via time-nuts < > [email protected]> wrote: > > > Hello everyone, > > > > I’ve seen a number of messages lately that reference the TimeHat boards I > > put together a couple of months ago, with lots of positive feedback, > which > > I really appreciate. The first run of boards I did sold fairly quickly, > and > > based on a number of emails I have gotten lately there seems to be some > > renewed interest. > > > > As such, I’m going to order up another batch of PCBs and parts, but I’d > > like to get an idea of how many I need to order to satisfy current > demand. > > The GPS modules come from China, so there is about a two or three week > wait > > them, so I want to make sure I have enough. > > > > For those not familiar, you can learn more about the TimeHat here: > > https://millerjs.org/timehat > > > > Regards, > > John > > _______________________________________________ > > time-nuts mailing list -- [email protected] -- To unsubscribe > send > > an email to [email protected] > > To unsubscribe, go to and follow the instructions there. > > > > -- > James Perkins <[email protected]> KN1X www.loowit.net/~james > 2030 W 28th Ave, Eugene OR 97405 +1.971.344.3969 mobile > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send > an email to [email protected] > To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
