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OSCAR-11 report






                OSCAR-11 REPORT    15 September 1998

Users of OSCAR-11 may be interested in two new WOD packages which I
have have recently added to my web site.  The first package
ORBILL.ZIP, enables various WOD channels to be compared with the
solar eclipse status of the satellite.  The second package U2MAG1.ZIP
compares measured and calculated magnetic fields encountered by the
satellite. Both packages are of an advanced nature, especially
U2MAG1.ZIP, which is rather complicated!. Users will need experience
of using the other WOD packages on the web site, and a spread sheet
program.  Details of web site are given below.

Its been another uneventful month for OSCAR-11. During the period 15
August to 15-September good signals have been received from the
145.826 MHz. beacon.  Telemetry nominal. The battery voltage
continues to improve, averaging 13.8 volts, with values ranging from
13.6 to 13.9 observed.

The  internal  temperatures  are slowly increasing and are now 6.6C
and 4.8C for battery and telemetry electronics respectively, showing
an increase of about 3C during the month.  This is due to the
decrease in solar eclipse times, which is improving the power budget,
without creating excessive internal temperatures.

The  single WOD survey, of channels 1, 2, 3, 61 (magnetometers) dated
01-July-1998, starting at 16:24:09 UTC has continued to be transmitted.

A reports of the OSCAR-11 mode-S beacon  have  been  received  from
Ted WA2HKS who has heard the becon many times during the last two
months.  Many thanks Ted.

The operating schedule is unchanged.

        ASCII status (210 seconds)
        ASCII bulletin  (60 seconds)
        BINARY SEU (30 seconds)
        ASCII TLM (90 seconds)
        ASCII WOD (120 seconds)
        ASCII bulletin (60 seconds)
        BINARY ENG (30 seconds)

The ASCII bulletin is currently a static message, detailing modes and
frequencies of all the amateur radio satellites.

There  are  additional  status  blocks  after  each bulletin is
transmitted, and between ASCII TLM and WOD.

The mode-S beacon is ON, transmitting an unmodulated carrier, but
telemetry indicates that it has partially failed, and delivering half
power.  This beacon is a useful test source for those testing mode-S
converters, prior to the launch of P3-D.  It is considerably weaker
than DOVE, which should be used for initial testing. Any reports of
reception on 2401 MHz.  would be most welcome.  Please e-mail
g3cwv@amsat.org.

The 435.025 MHz. beacon is normally OFF.  However it can sometimes be
heard when the satellite is being commanded by ground control, ie.
within range of Guildford, UK.  When the 435 beacon is transmitting,
the 145 beacon is normally OFF.  The data transmitted is mainly
binary.

Listeners to OSCAR-11 may be interested in visiting my web site.  The
web site contains details of hardware required and some software for
capturing data, and decoding ASCII telemetry and WOD.  There is an
archive of raw data (mainly WOD) for analysis, which is continually
being expanded, as new data is captured.  Also included are some
audio files, examples of each type of data transmitted by OSCAR-11,
each one plays for about ten seconds.  There are also examples of
mode-S reception.  All the audio files are zipped, so that they can
be played off-line.  These should help listeners identify the various
types of data, and give an indication of the signal quality required
for successful decoding.

The URL is -

      http://www.users.zetnet.co.uk/clivew/

If you place this bulletin on a terrestrial packet network, please
use the bulletin identifier $BID:U2RPT29.CWV, to prevent duplication.

73 Clive G3CWV   g3cwv@amsat.org

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