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OSCAR-11 Report






                OSCAR-11 REPORT    14 October 1998

During the period 15-September to 14-October good signals have been
received from the 145.826 MHz. beacon.  Telemetry nominal. The
battery voltage continued to improve, averaging 13.9 volts, with
values ranging from 13.6 to 14.0 observed.

The internal temperatures have continued to increase and may have
reached a peak of 9.6C and 7.8C 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 Z-axis magnetometer counter reached its limit of 1024 around
03-October.  However the spin period was rather low at around 305
seconds and remained near that value until the counters were
reset on 09-October by ground control.

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 for most of the period.  A new WOD of the same channels
dated 10-October-1998 at 0:0:05 UTC has just started.

A report of the OSCAR-11 mode-S beacon  have  been  received  from
Jack W9JIU of Tucon Arizona, who commented that the signals were
weaker than in the Spring. Many thanks Jack.

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:U2RPT30.CWV, to prevent duplication.

73 Clive G3CWV   g3cwv@amsat.org



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