[amsat-bb] PSAT Elements are 6 minutes early

[Nico Janssen]

Bob,

Yesterday and today I performed detailed doppler measurements on high 
PSAT passes,
both on 70 cm and on 2 m.
I found that yesterday the satellite was 10 seconds early and today 14 
seconds early,
compared to the ULTRASat3 TLE set.

I wonder why you think it is 6 minutes late. Maybe you were confused by 
the ASCII
telemetry transmissions on 145.826 MHz of UoSAT-OSCAR 11, which passed 
about 6 minutes
after PSAT?

73,
Nico PA0DLO


On 2015-05-22 20:21, Robert Bruninga wrote:
> I am finding that PSAT is 6 MINUTES behind the predictions of the previously
> provided original Launch TLE :
>
> ULTRASat3
> 1 99993U          15140.67013889  .00040043  00000-0  10235-2 0 00009
> 2 99993 055.0004 339.9238 0251027 182.3314 074.3075 15.12517086000014
>
> So until I get new ones.  Just point at AOS and wait 6 miuntes.
>
> Also, I had said not to TX PSK31 on the 10m u plink until you heard the
> downlink.  Well, that was dumb advise, because the transponder does not come
> up unless it hears PSK31!
>
> So the new rule is, Listen first.  If not heard, TX anyway.  If not heard
> then, Fix your problem, and try again?
>
> We don’t know how the power budget will work out.  So all we can do is
> watch.
>
> Bob, WB4APR
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