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OSCAR-11 Report







                OSCAR-11 REPORT    16 April 1999

Regular listeners to OSCAR-11 may be interested in some recent
additions to my web site. These are WOD surveys dated 10-October-1998
& 04-January-1999 Magnetometer Channels 1, 2, 3, 61 and Channels 10,
20 ,30, 40 Solar Array Currents & Voltage dated 06-January-1999. The
survey dated 04 January is from a single pass, and would benefit by
being merged with other data captured from this survey.

I have also updated the program TOSPLOT.BAS to v1.2. Unfortunately
there was a minor error in the previous version of TOSPLOT, which
caused problems when processing WOD surveys with dates after 1998.
The current version of U2WOD has now been updated, but if you
downloaded this package BEFORE 27-March-1999 then you should download
this new version of TOSPLOT.BAS.  Note TOSPLOT is only required if
you wish to use the SPLOT plotting program written by the University
of Surrey.  No other files in U2AWOD package have been changed, and
there are no problems with SPLOT.EXE

During the period 16 March to 15 April 1999 good signals have
been received from the 145.826 MHz. beacon. The battery voltage
during daylight passes has decreased, particularly towards the end of
the period.  The average value is 13.6, with 13.3 recorded on one
occassion.

The internal temperatures have decreased slightly and are now 4.0C
and 2.2C for battery and telemetry electronics respectively.

The WOD survey dated 06-January-99 of solar array currents and
array voltage ie.channels 10, 20, 30, 40 (+Y, -X, +X, V), has now been
replaced by channels 39, 50, 52 & 63 (telemetry electronics
temperature, battery charge current, battery voltage, and BCR
status). A quick look at current WOD shows the battery voltage varying
between 13.4 and 14.1 during sunlight, and a steady decrease to 12.3
volts during the eclipse period.

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:U2RPT36.CWV, to prevent duplication.

73 Clive G3CWV   g3cwv@amsat.org



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