Observation 7259931: NEXUS (43937)

Satellites & Observations Observations
1

Regarding Observation 7259931 …
Many of my UHF observations have a similar trace shape i.e: a gradual +ve increase in drift from the beginning of the pass to then returning gradually to zero drift. But many observations having a similar profile. However, some do not. Is it caused by a doppler effect or …? Just curious to know.

2

There was a gap for TLE sets for ~24h, so this was the main issue.

3

But it’s been occurring for many weeks, hence my query. Any further thoughts please?

4

Then this is an issue with the station. There are two reasons:

  1. The time on the station isn’t synced.
  2. The location set for the station is wrong.

Check the " Observations seem off-frequency?" section on the troubleshooting guide:

https://wiki.satnogs.org/Troubleshooting#Observations_seem_off-frequency.3F

5

Thanks Fredy, you are quite correct. My ntpd was failing to synchronise.
I was having a dumb day - why didn’t I think of that?
All fixed now.
73 Roger M0ROJ

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