[amsat-bb] PSAT Elements are 6 minutes early

Sat May 23 16:37:02 UTC 2015

PSAT-1>APOFF,ARISS [05/23/15 16:08:09]:T#151,879,075,549,914,873,00011100

Received APRS packet a few minutes ago at 05/23/15 16:08:09Z with 
Receiver: Kenwood TM-D710GA in Packet12 mode 
PC logging: Connected to PC with RS-232, using HyperTerminal to log packets.
Antenna: Arrow 2 meter vertical 15’ off the ground.
My grid is CN85TQ north of Portland, OR.

Do I understand corectly that PSAT-1 was digipeated through the ISS in this case?

I did not see this in the recent activity on 
http://ariss.net/index.cgi?absolute=1

20150523155003 : RS0ISS]CQ,qAR,9W2JDY-1:]ARISS - International Space Station
20150523154803 : RS0ISS]CQ,qAR,9W2JDY-1:]ARISS - International Space Station
20150523151605 : PP5CAM-2]APUD01,RS0ISS*,SGATE,qAo,PY5UD:=2607.01SI04948.11W&** PP5CAM/PY5UD H24 BRAZILIAN ISS SAT GATE **
20150523151246 : PP5CAM-2]APUD01,RS0ISS*,SGATE,qAo,PY5UD:=2607.01SI04948.11W&** PP5CAM/PY5UD H24 BRAZILIAN ISS SAT GATE **
20150523151106 : PP5CAM-2]APUD01,RS0ISS*,SGATE,qAo,PY5UD:=2607.01SI04948.11W&** PP5CAM/PY5UD H24 BRAZILIAN ISS SAT GATE **
20150523150828 : LU2HAM-6]APRS,RS0ISS*,PCSAT,RS0ISS-4,W3ADO-1,WIDE3-3,qAo,LU2HAM-1:=3120.48S/06418.04W`Sat Gate H-24 Cordob {UISS53}
20150523150800 : RS0ISS]CQ,qAo,LU2HAM-1:]ARISS - International Space Station

73,
Clear and dark skies without RFI,
David Haworth, WA9ONY
http://www.stargazing.net/david

> On May 23, 2015, at 9:13 AM, Ken Swaggart <k.swaggart at charter.net> wrote:
> 
> The keps certainly look good here in Oregon. I had a predicted PSAT AOS out over the Pacific Ocean at 16:02:01Z and picked up the first PSK-31 beacon at 16:02:16Z.
> 
> Ken, W7KKE
> 
> -----Original Message----- From: Robert Bruninga
> Sent: Saturday, May 23, 2015 07:51
> To: AMSAT BB
> Subject: Re: [amsat-bb] PSAT Elements are 6 minutes early
> 
> Today, (over USA) I am finding satellite to be 8.5 minutes behind the
> ULTRAsat3 TLE.  And get a very good match.  I am listening to the PSK31 *FM*
> downlink on 435.350 +/- 5 KHz and swinging the beam and watching Doppler to
> confirm I am tracking well.
> 
> But Nico (below) sees it on time in Europe.   I cannot explain the
> difference... I am using the elements with an EPOC of 15 140.6701389 (shown
> below) which were released at separation.  There have been no updates yet.
> As soon as I get them I will post them.
> 
> I did just turn on 3 USA and 3 European packet bulletins.  And adjusted the
> MA spacecraft counter so that the right bulletins will come on over the
> right continents.  DIGI will remain off since PSK31 is working so well!
> 
> Bob, Wb4APR
> -----Original Message-----
> From: Nico Janssen
> Sent: Saturday, May 23, 2015 10:24 AM
> 
> 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
>> _______________________________________________
>> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
>> to all interested persons worldwide without requiring membership.
>> Opinions expressed are solely those of the author, and do not reflect the
>> official views of AMSAT-NA.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions expressed
> are solely those of the author, and do not reflect the official views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb 
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions expressed
> are solely those of the author, and do not reflect the official views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb

73,
Clear and dark skies without RFI,
David Haworth, WA9ONY
http://www.stargazing.net/david <http://www.stargazing.net/david>
davidahaworth at icloud.com