[amsat-bb] JY1-sat dashboard

[Hasan al-Basri]

I have run several more passes, and I'll have to agree. Something is not
right with the auto-tuner. It has to be baby sat, contantly dropping lock
in response to the auto tune not functioning even well within the specified
range.
73, N0AN


Hasan

On Sat, Dec 8, 2018, 3:25 PM Kevin <wa7fwf at gmail.com wrote:

> Final thought on this,
>      JY1SAT dashboard is broke, I started it and the Funcube dashboard
> together and at the end of the pass the two were within one decode of
> each other, I let them idle until the next pass and at the end of that
> next pass FC 220 JY1 139 decodes.
>
>     It's not a signal issue as the signal is booming in and they are
> both using the same dongle, my guess would be that that it never gives
> up looking for the signal in the last place it saw it, so the sat has to
> doppler down close enough to that point for it to pick it up again.
>
>    A video of how JY1 sits there and ignores the signal is in the link
> below, hopefully the link  does not get stripped out from this email.
>
> https://www.dropbox.com/s/sc3ln32y8u4s6uk/jy1sat.mp4?dl=0
>
> For now I will just not run the  JY1 dashboard for telemetry gathering.
>
> 73 All
> WA7FWF
>
>
>
> On 12/8/2018 9:58 AM, Kevin wrote:
> > Last pass I sat and watched the signal peak and the tuning bar sat
> > still near the low end ignoring it so I manually dragged it to the
> > center of the signal where it fluttered trying to go back to where it
> > had been and refused to lock, I then grabbed the lower limit and
> > pulled it over to the signal and the tuning bar moved with it and
> > finally locked, I put the lower edge back to where it had been and and
> > it stayed locked on the signal for the duration of the pass.
> >
> > FWIW
> >
> > kevin
> >
> > On 12/8/2018 9:44 AM, Hasan al-Basri wrote:
> >> OK, pass of JY1SAT at 17:24z
> >>
> >> AOS 9 sec early, LOS 9 sec late.
> >>
> >> Doppler Tracking:
> >> Sat moves down in frq on approach. lock lost earlier as it drifts down,
> >> than lock lost as it drifts up.
> >>
> >> Had to correct freq 4 times as it drifted down, 2 times as it drifted
> >> up.
> >>
> >> Best Guess:
> >>
> >> The other two software packages "seem" to handle freq errors
> >> better...only
> >> because their KEPs are really good and therefore the doppler is dead on.
> >>
> >> In other words, JY1SAT (JO-97) cannot capture TLM unattneded without
> >> signficant frame loss, until the keps get better.
> >>
> >> My earlier assessment is most likley wrong...there isn't anything wrong
> >> with JY1SAT Dashboard.
> >> 73, N0AN
> >> Hasan
> >>
> >>
> >> On Sat, Dec 8, 2018 at 11:06 AM JoAnne K9JKM <joanne.k9jkm at gmail.com>
> >> wrote:
> >>
> >>>>> There is something not quite right with JY1 Dashboard software.
> >>> I don't know if the problem is related to the JY1SAT testing and
> >>> commissioning procedures. Here is an excerpt about JY1SAT status the
> >>> FUNcube
> >>> operations list forwarded for the ANS bulletins (coming out later this
> >>> weekend):
> >>>
> >>> "Commissioning of the spacecraft [JY1SAT] is continuing and there
> >>> will be some periods when the telemetry being transmitted is not valid.
> >>> This will show up with invalid data collection flags in the dashboard."
> >>>
> >>> Caveat - I don't run the JY1SAT dashboard here so I'm unable to comment
> >>> further.
> >>>
> >>> --
> >>> 73 de JoAnne K9JKM
> >>> k9jkm at amsat.org
> >>>
> >>>
> >>>
> >>>
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>
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