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@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

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@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@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@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@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@icloud.com