Yo Greg! On Thu, 22 Jan 2026 09:38:58 -0500 Greg Troxel <[email protected]> wrote:
> > Ugh. That will not work. I find more them 2km and the benefits are > > small. > > It's really hard to say. You have much worse experience with RTK > than I do. While 40 km is a bit much, I have great positioning > results with network RTK where the closest stations is 20 km, a > friend getting sub-cm repeatable positions with a tripod, and me > within a 4 cm diamater circle handheld prism pole watching the level. By "network RTK", I assume you mean the type that uses a number of base stations to compute an RTK feed adjusted for your position? Those can work well. Also SPARTNv2 can do better than meter accuracy world wide. > I don't think it is at all clear that the RTCM stream accessed over > NTRIP is "bad". Just not "good". > Log the NMEA from the receiver, or gpsd'd processed version, for a > decent interval (min 4h) in autonomous mode, and then again with > RTK. Graph each of them to understand how tight positions are. Look > at fixmode and see if you are in float or fix. Yeah, get to the root of the issuue, not several layers down the stack as it affects your system clock. > If you really want to understand, get a stable 1 pps source, like a > budget GPSDO (e.g. Bodnar), and a way to compare that pps signal to > the F9P's, probably like the TAPR TICC > https://tapr.org/product/tapr-ticc/ The TICC is great. ebay will sell you a Rybidum clock for around $100 to $300 these days. RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 [email protected] Tel:+1 541 382 8588 Veritas liberabit vos. -- Quid est veritas? "If you can't measure it, you can't improve it." - Lord Kelvin
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