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[jamsat-news:1317] * SpaceNews 21-Aug-00 *

* SpaceNews 21-Aug-00 *

BID: $SPC0821


		 	 MONDAY AUGUST 21, 2000

During the period 17 July to 15 August 2000, good signals have been
received from OSCAR-11's 145.826 MHz VHF-FM beacon, in spite of the
rather low battery voltage for much of the time.

The battery voltage observed during daylight passes has slightly
increased.  The average value observed was 13.6, with a range of
13.4 to 13.9 volts.

The internal temperatures have increased by 1.4C during the month.
They are now 0.4C and -1.0C for battery and telemetry electronics
respectively.  This rise in temperature is expected as the solar
eclipse times become shorter.

The single Whole Orbit Data (WOD) telemetry survey of channels 10, 20,
30, 40 (+Y, -X, +X solar array currents, array voltage), dated January 06
has been transmitted.  Note the year of this WOD survey is incorrectly
displayed as 99.  This survey clearly shows the solar eclipses, and a
spin period of 340 seconds.

The satellite's 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.  However, the signals are very
weak, and there is a lot of Doppler shift.  Users should also note that
the polarization of OSCAR-11 is left-hand circular.  Even if you can't
hear OSCAR-11's S-band beacon transmitter, your equipment may still be
suitable for P3-D.  Any reports of reception on 2401 MHz would be most
welcome, and should be directed to Clive Wallis at: g3cwv@amsat.org.

OSCAR-11's 435.025 MHz UHF beacon transmitter 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 UHF beacon is
transmitting, the VHF beacon is normally OFF.  The data transmitted is
mainly binary.

Listeners to OSCAR-11 may be interested in visiting a web site dedicated
to this satellite.  The 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 containing 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:


[Info via Clive Wallis, G3CWV (g3cwv@amsat.org)]

John, F6HCC recently supplied the following list of APT weather
satellites transmitting on VHF frequencies:

 * NOAA-12 on 137.500 MHz

 * NOAA-14 on 137.620 MHz

 * NOAA-15 recently failed -- bad pictures on 137.500 MHz

 * NOAA-16 previous launch Aug, 29. freq 137.500 or 137.620 MHz

 * METEOR-3/5 on 137.300 MHz (alt 1200 km).

 * RESURS on 137.850 MHz

 * OKEAN occasionally on 137.400 MHz (Europe)

[Info via John, F6HCC]

Dirk, ON1DLL, reports that the AMSAT-OSCAR-16 satellite is currently
transmitting telemetry and brief text announcements in 1200 baud BPSK.
The text announcements reads as follows:

	June 2000
	S-Band off
	PSK Tx power 1.5 watts
	Digipeat is on
	AO16 Command Team <WJ9F>

The BBS has been off since the last software crash.

Thanks to all who recently sent messages of appreciation for SpaceNews,


Comments and input for SpaceNews should be directed to the editor
(John, KD2BD) via any of the paths listed below:
WWW:        http://www.njin.net/~magliaco/
MAIL:       John A. Magliacane, KD2BD
            Department of Engineering and Technology
            Brookdale Community College
            765 Newman Springs Road
            Lincroft, New Jersey 07738
INTERNET:   kd2bd@amsat.org, magliaco@email.njin.net

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