Tag: Oscar 40

Active magnetorquing of AO-40 to hold ALON relatively steady and begin to lower ALAT has begun. On 18 May 2003 ALON/ALAT was approximately 329/7. A better determination will be possible now the ALAT has dropped below 15 degs. and the earth enters the camera field of view.

Hopefully passbands will be on soon during the first half of the orbit, if all goes well.

The A-blk message of the day section now includes height, Lon/Lat of the subsatellite point, and ALON/ALAT. All of these values are generated by the IHU-1 software based on its orbital and magnetorquing calculations. ALON/ALAT is also updated from the ground when a new magnetorquing command is issued.

[ANS thanks Stacey, W4SM, for the above information]

Klla: ANS 138

ALON/ALAT is now ~327/11, with ALAT decreasing slowly toward 0.

The passbands will be on starting tomorrow, MA 20-100.

Please remain well clear of the middle beacon as both image downloading and FEC testing will be taking place
intermittently.

— W4SM for the AO-40 Command Team

Klla: amsat

The passbands will be operational again within a few days from approximately MA 20 to 100.

This interval will change as we follow the sun and ALON increases toward 360.

We are awaiting one more good set of images and verification of ALON/ALAT before activating the passbands.

– –W4SM for the AO-40 Command Team

Alon/Alat 18/5 329/7

Klla: amsat

From Stacey: We are about to begin active magnetorquing to hold ALON relatively steady and begin to lower ALAT. Current ALON/ALAT is approximately 330/25, but better determination will be possible once the ALAT drops below about 15 degs. and the earth enters the camera field of view.

We hope to have the passbands on during the first half of the orbit within about 1 week, if all goes well.

The A-blk message of the day section now includes height, Lon/Lat of the subsatellite point, and ALON/ALAT. All of these values are generated by the IHU-1 software based on its orbital and magnetorquing calculations. ALON/ALAT is also updated from the ground when a new magnetorquing command is issued.

Klla: AMSAT-DL

There has been a high level of mail in recent days re: hearing AO-40.Readers of the amsat-bb should be aware from Stacey W4SM s recent posts that AO-40 has now entered a drifting phase.

The information below (prepared by W4SM) details the predicted behaviour of AO-40 through to the middle of May.

Please note the information is on a day by day basis, not orbit by orbit.

The information is presented to assist those who are fine tuning their gear,collecting telemetry etc.

On the subject of telemetry collection the norm for 100% OK blocks is for Squint angles, 0 to 36 and 60 to 70 degrees.

I mention norm, because the above ranges of squint angles apply when the Alon/Alat are nominally 0/0.

However during the drifting phase the norm no longer applies, specially in respect to the side lobe at squint 60 to 70 degree. Good reception of telemetry is available in the 50 to 70 degree range, but is range dependent.

There are lots of positives that can be gained during this drifting phase.Every block of telemetry forwarded to ao40-archive@amsat.org is greatlyappreciated.

Colin VK5HI (AO-40 Command Team Member)

AO-40 ATTITUDE – PRECESSION BEHAVIOR / W4SM
Mystery Effect = -17.760 degs ALON/week

DATE ALON ALAT SA
2003 Apr 22 [Tue] 31.0 21.8 -36.6
2003 Apr 23 [Wed] 28.3 21.8 -38.9
2003 Apr 24 [Thu] 25.6 21.8 -41.0
2003 Apr 25 [Fri] 22.9 21.9 -43.0
2003 Apr 26 [Sat] 20.2 21.9 -44.8
2003 Apr 27 [Sun] 17.5 21.9 -46.4
2003 Apr 28 [Mon] 14.8 21.9 -47.8
2003 Apr 29 [Tue] 12.1 22.0 -49.0
2003 Apr 30 [Wed] 9.4 22.0 -49.9
2003 May 01 [Thu] 6.7 22.0 -50.5
2003 May 02 [Fri] 4.0 22.0 -50.8
2003 May 03 [Sat] 1.3 22.1 -50.9
2003 May 04 [Sun] 358.6 22.1 -50.6
2003 May 05 [Mon] 355.9 22.1 -50.0
2003 May 06 [Tue] 353.2 22.1 -49.2
2003 May 07 [Wed] 350.5 22.2 -48.0
2003 May 08 [Thu] 347.8 22.2 -46.7
2003 May 09 [Fri] 345.1 22.2 -45.1
2003 May 10 [Sat] 342.4 22.2 -43.3
2003 May 11 [Sun] 339.7 22.2 -41.3
2003 May 12 [Mon] 337.0 22.3 -39.2
2003 May 13 [Tue] 334.3 22.3 -36.9
2003 May 14 [Wed] 331.6 22.3 -34.6
2003 May 15 [Thu] 328.9 22.3 -32.1

Klla: amsat

Per-ke SM4UVP frgar p mailinglistan:

Hej jag tnkte hra med er som r Qrv p AO40 om det r dliga frhllanden just nu fr att ev lyssna efter satelliten. Hur viktigt r det med den sk sqint vinkeln.
Och nr i s fall vet man att det r ngon ev ide att testa. Hlsningar SM4UVP Per-ke 73 73.

Hkan SM7SWJ svarar:

Vad jag hrt s r det sista bra lget p lrdag, sedan s r det 4 veckor tills satelliten ska vara krbar igen. Just nu s r det vl en sdan period som vi hade i hstas nr satellitens antenner vndes frn jorden. Framt sommaren s laddar vi fr fullt med ny 90cm parabol i masten och G3RUH patch.

73 Hkan SM7WSJ

ven Olle SM0DY svarar:

Bsta informationskllan betrffande AO-40 r AMSAT-DL:s hemsida http://www.amsat-dl.org .W4SM har en liten artikel skriven fr ngon dag sedan om hur Undanmanvern kommer att g till. Man slr av transpondern den 19 april 2350 UTC och har den avslagen i ca fyra veckor.

73 de SM0DY/Olle

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