"During sunrise" Isn't it more likely to be due to changes in the ionosphere during sunrise/set that causes the timing discrepancies. Any changes to the antenna / LNA due to temperature will affect the reception of all satellites so should cancel out.
Andy www.g4jnt.com On Thu, 12 May 2022 at 08:33, Matthias Welwarsky <time-n...@welwarsky.de> wrote: > Dear list members, > > My DIY GPSDO has a rather well defined dependence to the environmental > temperature, which correlates almost linearly with a frequency shift of > the > OCXO. However, at times I see the error against the GNSS reference > increasing > with its case temperature not warranting such effect. > > My antenna is one of those cheap, magnetic, active antennas you'd put on a > car > roof. It's facing south and has full exposure to the sun, obviously. > > During sunrise I see the TIC error increasing 20ns-30ns over lets say 2000 > seconds. The GPSDO case temperature rises, too, during that time as the > room > temperature increases, but it is only by 0.3°C. > > I'm wondering if the temperature of the antenna, which of course rises > much > faster than the room temperature, can have an effect of this magnitude? > > Best regards, > Matthias > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-le...@lists.febo.com > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com
