Subject: UO-22 Report 12 (Image List)
To: Info Services <
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Date: Mon, 29 Jul 91 19:34:34 BST
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From: uunet!ee.surrey.ac.uk!J.W.Ward
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UOSAT-OSCAR-22 Report (12)
17:30 UTC 29 July 1991
We have now completed the initial phase of UoSAT-OSCAR-22's commissioning (and
also a successful AMSAT-UK Colloquium at UoS). All of UO-22's subsystems have
been exercised and are working. Although we have been preoccupied by the CCD
camera, we have also checked the horizon sensors and total radiation dose
experiment during the last few days.
With the commissioning complete and several good CCD images in the RAMDISK, we
will now "open" the UO-22 uplink to amateur stations. As stated in previous
releases, UO-22 is primarily a data downlinking satellite, not a BBS
communications satellite. We expect that most stations using UO-22 will be
downloading raw CCD images using the PACSAT Broadcast Protocol. Since we don't
intend to support BBS operations, only the Broadcast Protocol server will be
available, not the FTL0 file server. Of course, without the FTL0 server, there
is no way for you to get a directory of files on the satellite, and you are
working 'blind'. We will solve this problem in the near future with a
broadcast directory. In the mean time, please check UO-14 for a list of recent
picture files, or capture whatever UO-22 file we have placed on long
broadcast. Please do not "go fishing" by trying to broadcast every file on the
satellite. A list of interesting files is included in this release.
The UO-22 picture files are more than 300 kbytes long. In our experience, you
can easily receive one of these files in a pass. We would suggest, however
that stations resist the temptation to Begin broadcasts. If several stations
in the footprint Begin broadcast of the same 300 kbyte file, the broadcast
protocol will work inefficiently, and a lot of repeated data will be sent on
the downlink. Use the Broadcast Protocol in its most efficient mode: Grab or
Capture for a couple of passes, then request hole fills to get the parts of
the picture which you have missed. This will result in the best performance
for everyone. We will all have a lot to learn about Broadcast operation with
such large files.
The OBC186 and Transputer CCD support programs on the satellite are still
being debugged, so not all of the pictures we take will have the "nominal"
data format. In particular, there are sometimes 254-byte blocks repeated at
places in the raw picture files. If you are happy working your way through
such problems, then by all means do so. If you prefer to get your images after
they've been cleaned up, then wait for GIF files to be uploaded to UO-14. Some
custom utilities and shareware programs for doing your own GIF conversions
will be placed on UO-14 soon.
73,
Jeff Ward, G0/K8KA
I = rotate image 180 degrees for best orientation
r = image contains some repeated 254-byte data packets
FILE # DATE TIME LAT LON SCENE
--------- ------------- ------------ ---- ----- ---------------
CCD0 (30) SAT 20 JUL 91 22:22:00 UTC 68.4oN 155.7oW ALASKA ?
CCD1 (33) SUN 21 JUL 91 10:12:25 UTC 40.4oN 11.8oE ITALY + GREECE
CCD0A (30) MON 22 JUL 91 21:24:00 UTC 34.1oN 156.9oW HAWAII ?
[The above files are no longer on the satellite. Overwritten.]
CCD1A (33) TUE 23 JUL 91 07:25:00 UTC 26.8oN 50.6oE PERSIAN GULF (I)
CCD2A (39) TUE 23 JUL 91 10:52:00 UTC 4.2oN 4.8oE EQUATORIAL AFRICA
CCD3 (8f) TUE 23 JUL 91 14:12:00 UTC 6.5oN 54.4oW FRENCH GUYANA (I,r)
CCD4 (93) WED 24 JUL 91 08:29:00 UTC 29.7oN 35.2oE SINAI + NILE VALLEY (I)
CCD5 (97) WED 24 JUL 91 16:50:15 UTC 30.9oN 89.8oW FLORIDA + M'IPI DELTA (r)
CCD6 (9D) THU 25 JUL 91 09:31:02 UTC 39.4oN 21.9oE BALKANS (I)
CCD7 (A0) THU 25 JUL 91 17:53:14 UTC 37.2oN 104.2oW DENVER ? (r)
CCD8 (a5) FRI 26 JUL 91 02:15:30 UTC 34.8oN 129.7oE KOREA (I)
CCD9 (a9) FRI 26 JUL 91 15:43:00 UTC 17.2oN 75.5oW CUBA + HAITI (I)
CCD10 (aa) FRI 26 JUL 91 18:59:15 UTC 32.8oN 121.7oW CALIFORNIA (I)
CCD11 (b1) SAT 27 JUL 91 16:40:30 UTC 42.8oN 84.5oW GREAT LAKES (r)
CCD12 (b6) SUN 28 JUL 91 08:05:00 UTC 34.0oN 30.5oE EASTERN SOUTH AFRICA (I)
CCD13 (b8) SUN 28 JUL 91 11:55:00 UTC 36.9oN 3.2oW SPAIN + MAHGREB (I,r)
CCD14 (bd) MON 29 JUL 91 10:25:95 UTC DENMARK + NETHERLANDS (I)
CCD15 (be) MON 29 JUL 91 12:06:05 UTC Ireland
