Hi If you wan an external input, the Trimble NetRS shows up from time to time in roughly the same price range. It will do L1 and L2c.
If you do go the chip route and supply an external input, the chip’s do not do a cleanup loop on the input. The phase noise specs on the “required” input are fairly tight as a result. The input is also (no big surprise) not very tolerant of spurs and “bumps” in the noise. I ….. ummm …. errr…. have some experiance at doing it the wrong way on GPS chip sets… :) Bob > On Jan 22, 2019, at 3:22 AM, Magnus Danielson <mag...@rubidium.se> wrote: > > Hi, > > The one thing which is missing is a external frequency input. You can get a > frequency output in its place, but it does not fully replace the input. > That's where the module vs. chip comes in. > > Very tempted to try one out. > > Cheers, > Magnus > > On 2019-01-22 01:42, Bob kb8tq wrote: >> Hi >> >> At least at this point things like sawtooth correction outputs are still a >> “who knows if there is one” >> kind of thing. Doing a GPSDO and not having sawtooth corrected out is sort >> of a letdown …. >> Stuff gets better from L1 / L2, but then gets worse when you put hanging >> bridges back in …. >> Keep in mind that hanging bridges do not *always* average out. >> >> Bob >> >>> On Jan 21, 2019, at 4:43 PM, J. Grizzard <elfchief-timen...@lupine.org> >>> wrote: >>> >>> Per the integration guide >>> (https://www.u-blox.com/sites/default/files/ZED-F9P_IntegrationManual_%28UBX-18010802%29.pdf), >>> the recommended antenna should be between 30dB and 40dB of gain. >>> >>> Additional note: ublox is releasing an eval board (p/n C099-F9P) which is >>> similar to the sparkfun board, except a less annoying form factor (can work >>> as a standalone thing, or fit on an arduino), additional interface options >>> (wifi and bluetooth, pretty useful if you're doing RTK), less annoying >>> connectors (SMA), and ships with the ublox multi-band antenna ... all for >>> $50 more than the sparkfun, according to digi-key. They're not available >>> yet, but I imagine the will be soon. See >>> https://www.u-blox.com/en/product/c099-f9p-application-board#tab-documentation-resources >>> for more details. >>> >>> On a vaguely related note, I wonder if it would be possible to retrofit >>> something like a AE6RV GPSDO with one of these. The footprint is pretty >>> different (and there's a big pile of ground/thermal connections on the >>> bottom of the new chip), but it seems like the actual electrical interface >>> is probably the same in the important ways, so it might be possible to make >>> an adapter board, maybe... >>> >>> -j >>> >>> On 1/21/19 8:32 AM, Bob kb8tq wrote: >>>> Hi >>>> >>>> Based on the F9P data sheet, you will need an L1 / L2 antenna that is wide >>>> enough >>>> to get the Galileo E5B as well as the Glonass L1OF and L2OF bands. The >>>> gotcha >>>> is that (so far) I have not found a gain number for the target antenna. As >>>> we have >>>> found on other modules, you do want to get the right gain. L1/L2 antennas >>>> range >>>> from 50+ db down to below 30 db. Simply tacking a pad on a 50 db antenna >>>> is not >>>> the best way to do things if you are in an urban area. >>>> >>>> There also is the issue of powering the antenna. It is not clear what sort >>>> of antenna >>>> bias circuit the SparkFun module has on it. If it simply is using the >>>> module’s bias setup >>>> that also could be an issue. Max Vcc on the module is 3.6V. The VCC_RF pin >>>> can have >>>> main Vcc - 0.1V max on it. If that *really* means that 3.3V is about it >>>> for antenna bias, >>>> that eliminates roughly 100% of all the used antennas out there. It also >>>> eliminates a >>>> number of the new ones. >>>> >>>> If you put in an external bias setup, there are a lot of antennas to pick >>>> from on eBay. >>>> They come and go. The used stuff generally will be 12V powered. It also is >>>> likely >>>> to have a pretty good data sheet on it. The new stuff from China seems to >>>> be sold >>>> by a variety of people who pop up for a while and then go away for a >>>> while. Making >>>> sure of what you are getting is a bit tough as a result. There are >>>> extensive stories >>>> in the archives ….. >>>> >>>> Bob >>>> >>>>> On Jan 21, 2019, at 10:21 AM, Graham / KE9H <ke9h.gra...@gmail.com> wrote: >>>>> >>>>> What kind of antenna is needed to simultaneously hear all of the systems >>>>> at >>>>> once? >>>>> My PCTel GPS antenna has a filter that limits it to only the US GPS >>>>> system. >>>>> >>>>> --- Graham >>>>> >>>>> == >>>>> >>>>> On Mon, Jan 21, 2019 at 4:01 AM Dustin Marquess <dmarqu...@gmail.com> >>>>> wrote: >>>>> >>>>>> If DigiKey's pricing is accurate, the ZED-F9T is $13.89 more than a >>>>>> ZED-F9P. I would have gladly paid $14 more for a version of the >>>>>> SparkFun board using the T(iming) version instead :(. >>>>>> >>>>>> On Mon, Jan 21, 2019 at 12:10 AM Bob kb8tq <kb...@n1k.org> wrote: >>>>>>> Hi >>>>>>> >>>>>>> From a *very* quick read of the doc’s: >>>>>>> >>>>>>> 1) The device *does* have a position hold capability >>>>>>> >>>>>>> 2) There is some level of data on the time pulse. It it only 1 ns >>>>>> resolution? >>>>>>> 3) It does appear to support Galileo and Glonas in addition to GPS. >>>>>>> >>>>>>> 4) It is clearly multi-band for GPS. It is unclear from a quick read if >>>>>> it is multi-band for the other systems. >>>>>>> 5) If you get one, make sure you have the RF cable connector it needs. >>>>>>> >>>>>>> 6) I have not (yet) found a recommendation for the antenna gain. >>>>>>> >>>>>>> Again, all from a quick read …. >>>>>>> >>>>>>> Bob >>>>>>> >>>>>>>> On Jan 20, 2019, at 5:42 PM, Mark Sims <hol...@hotmail.com> wrote: >>>>>>>> >>>>>>>> Sparkfun is now selling the Ublox F9P L1/L2 GPS receiver module on a >>>>>> board ($219). The F9P supports GPS/Galileo/Glonass/Beidou and tracks >>>>>> L1/L2 >>>>>> data. It outputs carrier phase data and has survey-in and fixed position >>>>>> support along with RTK support (10 mm accuracy). Looks like the F9P >>>>>> has 1 >>>>>> time pulse output. >>>>>>>> _______________________________________________ >>>>>>>> time-nuts mailing list -- time-nuts@lists.febo.com >>>>>>>> To unsubscribe, go to >>>>>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>>>>>> and follow the instructions there. >>>>>>> _______________________________________________ >>>>>>> time-nuts mailing list -- time-nuts@lists.febo.com >>>>>>> To unsubscribe, go to >>>>>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>>>>> and follow the instructions there. >>>>>> _______________________________________________ >>>>>> time-nuts mailing list -- time-nuts@lists.febo.com >>>>>> To unsubscribe, go to >>>>>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>>>> and follow the instructions there. >>>>>> >>>>> _______________________________________________ >>>>> time-nuts mailing list -- time-nuts@lists.febo.com >>>>> To unsubscribe, go to >>>>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>>> and follow the instructions there. >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@lists.febo.com >>>> To unsubscribe, go to >>>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>>> and follow the instructions there. >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@lists.febo.com >>> To unsubscribe, go to >>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
