Author Archives: PE0SAT

Catch the Last ARISSat-1 Telemetry

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ARISSat-1Now that the submissions are complete for the Chicken Little Contest, AMSAT is announcing a new contest: Catch the Last ARISSat-1 Telemetry. With luck, we will have real time data to go along with the final reentry. While telemetry sent by e-mail is valuable and requested, the contest will be judged solely on data sent through the official ARISSatTLM programs directly to the Internet telemetry server.

How do I enter? Simple. Just submit ARISSat-1 telemetry over the Internet using either ARISSatTLM telemetry program. You can use the PC version or the MAC version of ARISSatTLM. You are automatically eligible.

Are there separate categories for entrants? No.

How is the winner determined? The call, or name, in the last block of data received by telemetry server wins.

How will the winner be announced? Via the usual AMSAT News Service, and on the Chicken Little Contest site.

If ARISSat-1 fails sometime before reentry, does it count? Yes! Engineering data is essential input for future projects!

What do I get if I win? A certificate in PDF format suitable for framing, and the gratitude of the ARISSat-1 team.

In short, just keeps those telemetry blocks flowing!

Remember: you can see the latest ARISSat-1 telemetry at ARISSat-1 realtime telemetry

Mark L. Hammond  [N8MH]

AubieSat-1 Designated AO-71

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AubieSat-1 Designated AO-71

AubieSat-1OSCAR Number Administrator, Bill Tynan, W3XO reports that he has ad- vised
J. M. Wersinger, PhD, KI4YAU, Professor Emeritus and Director of Auburn
University’s Student Space Program, that following the successful NASA ELaNa
III launch on October 28, 2011 of AubieSat-1, and by the request of the
AubieSat-1 team, the new satellite has been assigned an OSCAR number. Professor Wersinger documented that telemetry has been received from the satellite. The IARU-Sat Website states that AubieSat-1 was fully coordinated with the IARU. Bill wrote, “Therefore, by the authority vested in me by the AMSAT-NA President, I hereby designate AubieSat-1 as AubieSat Oscar 71 or AO-71 and welcome this newest OSCAR into the Amateur Radio satellite commun- ity. On behalf of AMSAT-NA and the world’s amateur radio satellite community, I congratulate Professor Wersinger, Auburn University and all of those responsible for building, testing and launching this new CubeSat. May its mission meet with success.”

[Thanks OSCAR Number Administrator, Bill Tynan, W3XO for the above
information]

RAX-2 is OBJECT E

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A good explanation from DK3WN on how to determine what TLE data belongs to what Satellite.

Based on the latest cubesat TLEs we have now three groups of objects (B+C+D, E, F+G). The first group are the 1U cubesats – they are only a few km apart. In 13 sec distance is RAX-2. I think F and G are the DICE sats.

Elena-III All TLE 02-11-2011

A simple way to determine the TLE, Take one beacon frequency – in this case 437.435 MHz (belongs to RAX-2). Then I calculated all the doppler frequencies for all objectes on a high 66 deg elevation pass. If the doppler = 0 then we have TCA. In this way you can calculate the distance between the TCA of each satellite.

Elena-III All TLE Doppler correction

You can see the 13 sec difference of RAX to to the first group (E1P, MCubed and AubieSat-1)

RAX-2 Zero 02112010 11:13UTC Pass

Take a look at the spectrogram – the horizontal yellow line is the center frequency of 437.345 MHz and the vertical one is the calculated time for RAX-2. And as chance would have it – we have a packet there. If you take the middle frequency of this 9k6 packet -> it all comes to one point.

Source: Satblog – DK3WN

Elana-III Cubesat TLE Lottery

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TLE LotteryThe search for the right TLE information has begun. After a launch, it’s always figuring out which objects in celestrak.com/NORAD/elements/tle-new.txt correspond to which satellite.

The first initial reports are available. Keep in mind when using these data, they will quickly change until the object information is linked to the correct satellite.

We suspect OBJECT B to be ?
We suspect OBJECT C to be ?
We suspect OBJECT D to be ?

We suspect OBJECT E to be RAX-2

We suspect OBJECT F to be DICE
We suspect OBJECT G to be E1P

Space Track 02-11-2011 17:29 UTC

OBJECT B
1 37850U 11061B   11305.51394459 +.00000487 +00000-0 +51357-4 0 00087
2 37850 101.7040 237.2054 0255998 281.2563 075.9820 14.77492974000595
OBJECT C
1 37851U 11061C   11306.52970872  .00006612  00000-0  54567-3 0    79
2 37851 101.7029 238.6826 0255867 278.7162 078.5097 14.77513975   743
OBJECT D
1 37852U 11061D   11306.52971894  .00011164  00000-0  91731-3 0    66
2 37852 101.6977 238.6724 0254624 278.8801 078.3646 14.77522609   745
OBJECT E
1 37853U 11061E   11305.92013487  .00009089  00000-0  74764-3 0    65
2 37853 101.6959 237.7989 0254900 280.7163 076.5435 14.77552774   651
OBJECT F
1 37854U 11061F   11306.52898599  .00014110  00000-0  11481-2 0    87
2 37854 101.6996 238.6806 0254637 278.7716 078.4718 14.77753179   735
OBJECT G
1 37855U 11061G   11305.51340081 -.00000195  00000-0 -36404-5 0    67
2 37855 101.6989 237.2087 0256557 281.4195 075.8285 14.77694693   587

E1P-U2 is Alive

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During the second passage there where again signals from E1P-U2 and because we now switched to LSB modulation, we heard recognizable signals. These where decoded with the use of MixW and the Explorer-1 telemetry decoding software by G3VZV. We now know that there are two active satellites which were launched this morning. E1P-U2 Explorer-1 [PRIME] and RAX-2 both are received.

E1P Telemetry Data