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.
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.
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.
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 [email protected] 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 [email protected]
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