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W4DPH > SAT 08.02.04 15:19l 265 Lines 9656 Bytes #999 (0) @ AMSAT
BID : ANS-039.S1
Read: GUEST DB0FHN
Subj: WEEKLY SATELLITE REPORT PART 1
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W4DPH
Sent: 040208/1411Z @:W4DPH.#TPA.FL.USA.NOAM #:22705 [CLW] FBB $:ANS-039.S1
From: W4DPH@W4DPH.#TPA.FL.USA.NOAM
To : SAT@AMSAT
AMSAT NEWS SERVICE BULLETIN 039.S1 FROM AMSAT HQ
SILVER SPRING, MD, February 08, 2004
TO ALL RADIO AMATEURS
BID: $ANS-03.S1
AO-40 AMSAT OSCAR 40
Catalog number: 26609
Launch Date: November 16, 2000
Uplink V-band 145.840 - 145.990 MHz CW/LSB
U-band 435.550 - 435.800 MHz CW/LSB
L1-band 1269.250 - 1269.500 MHz CW/LSB
L2-band 1268.325 - 1268.575 MHz CW/LSB
S1-band 2400.350 - 2400.600 MHz CW/LSB
Downlink: S2-band 2401.225 - 2401.475 MHz CW/USB
K-band 24,048.010 - 24,048.060 MHz CW/USB
Beacon: 2401.323, 24,048.035
Status: Currently Non-Operational
This from Stacey Mills, W4SM 01/29/2004:
The AO-40 command team has established a routine of trying to cycle the main
battery off (aux. battery on) and then the S2 Tx ON every orbit, using
simple
machine codes. Following this, the sequence to disconnect all
transmitters is
sent, to protect them from low voltage. If we have approximately 10
volts on
the main buss, then these commands should be making it through, but the S2
transmitter was not designed to run below 20 volts and is not coming
on. The
battery relay has been tested in the amsat lab, where a duplicate
exists, and
it will cycle reliably at 12 volts, but not lower. If we have less than 10
volts, then the commands will not be received because the IHU-1 and/or
command
receivers are insufficiently powered. Either way, the IHU-1 is not
currently
running IPS. The machine code commands only function in reset mode. We
assume that we currently have less than 12 volts and that either the
IHU-1 and
relay are not functional (<10 volts) or the relay isn't functional (<12
volts), because cycling the relay should get us out of this situation by
disconnecting the main battery.With regard to the stability of the
attitude/spin, this will not be a concern for a very long time. We are
currently rotating at 3.5 RPM. The spin decay rate is extremely slow. It
will take approximately 4 years to drop this to 3.0 RPM. We can magnetorque
at speeds as low as 1.5 RPM. The mystery effect will decrease ALON
approximately 11.5 degrees/week. It does not affect ALAT, though ALAT will
change slightly as the orbit precesses.MAIN BATTERY NOTES (and
conjecture):The
main batteries consist of three packs housed in sheet aluminum cases and
bolted to the radial braces between panels 1/6, 2/3 and 4/5. The cells
within
the packs have threaded metal binding posts and the cells are connected by
thick metal straps with strain relief "U's" in them. The pack at 2/3
consists
of 7 cells and is the negative end of the chain. The pack at 1/6
consists of
6 cells and is in the middle of the chain. The pack at 4/5 consists of 7
cells and is at the positive end of the chain. The main battery pack
at 1/6
is the closest battery to the "flaky" heat pipe thermistor, though it is
located "below" this heat pipe near the omni end of the spacecraft. Main
battery packs 4/5 and 1/6 lost their thermistors during the 400N incident.
Whether this was due to trauma to the battery or damage to the cabling is
unknown. If a short to ground occurred in the 1/6 battery pack it would
pull
the cells on the negative side of the short in this pack to zero, as well as
all cells in the 2/3 pack. Depending on the location of the short and the
status of the cells in pack 4/5, this could pull the main buss voltage
to half
normal (14 volts) or even 10 volts or below. <conjecture> A short at this
location might have generated enough localized heat (or even some hot metal
spatter) to damage the thermistor on the flaky heatpipe or, more
likely, its
wiring. This is appealing because it would represent a single point
failure,
rather than a failure cascade. One piece of evidence that doesn't
clearly fit
with this theory is that the cells in pack 2/3, the one main battery
pack that
still has a thermistor temperature sensor, do not appear to get warm
following
the voltage drop. We do not know how much capacity remained in these cells.
It is possible they contained relatively little energy. </conjecture>As
several of you indicated, we are in a waiting game for the main battery to
develop one "open" cell.
Ground stations capturing telemetry from AO-40 are asked to ZIP the file and
send a copy of the dat to the AO-40 archive at: ao40-archive@amsat.org.
For the current transponder-operating schedule visit:
http://www.amsat-dl.org/journal/adlj-p3d.htm
[ANS thanks AMSAT-DL and Stacey Mills, W4SM for this information][02082004]
=====
ARISS - INTERNATIONAL SPACE STATION
Catalog number: 25544
Launch date: November 20, 1998
Worldwide packet uplink: 145.990 MHz FM
Region 1 voice uplink: 145.200 MHz FM
Region 2/3 voice uplink: 144.490 MHz FM
Worldwide downlink: 145.800 MHz FM
Sponsors: AMSAT, ARRL, ARISS
Status: Operational since September, 2000. Digipeater: Active
The current Expedition 8 crew is:
Commnader Mike Foale, KB5UAC
Flight Engineer Alexander Kaleri, U8MIR
There currently are reports of the Packet station operating in 'simplex'
mode i.e. uplink/downlink on 145.800. Please send any confirmations to
ans-editor@amsat.org.
The ISS daily crew schedule can be found at:
http://spaceflight.nasa.gov/station/timelines/
Remember that the crew operates on UTC time. Also, all of the time line
is NOT translated from Russian and posted.
U.S. callsign: NA1SS
Russian callsigns: RS0ISS, RZ3DZR
TNC callsign: RS0ISS-1
More information is available at: http://ariss.gsfc.nasa.gov/ or
http://www.rac.ca/ariss or http://www.marexmg.org/fileshtml/unprotopage.html
or http://www.issfanclub.com
[ANS wishes to thank Bill, VE7WFG and the ARRL Letter][01182004]
=====
AO-7 AMSAT OSCAR 7
Catalog number: 07530
Launch Date: November 15, 1974
Return to active status: June 21,2002
Uplink: 145.850 to 145.950 MHz CW/USB Mode A
432.125 to 432.175 MHz CW/LSB Mode B
Downlink: 29.400 to 29.500 MHz CW/USB Mode A
145.975 to 145.925 MHz CW/USB Mode B
Beacon: 29.502 MHz, 145.972 MHz, 435.1 MHz, 2304.1 MHz
Status: Semi-operational in sunlight.
Emily, W0EEC has created a website to allow the users of AO-7 to record
contacts, observations and use of the satellite more effectively at
http://www.experthams.net/ao7
This includes the ability to log contacts.
Tim, K3TZ has written a program to decode AO-07 telemetry. The program can
be downloaded at:
http://www.qsl.net/k3tz/files/K3TZ_AO-07_Telemetry_Decoder_0.5.zip
For more AO-7 info: http://www.amsat.org/amsat/sats/n7hpr/ao7.html
=====
RS-15 RADIO SPORT RS-15
Catalog number: 23439
Launch Date: December 26, 1994
Uplink: 145.858 to 145.898 MHz CW/USB
Downlink: 29.354 to 29.394 MHz CW/USB
Beacon: 29.352 MHz (intermittent)
SSB meeting frequency: 29.380 MHz (unofficial)
Status: Semi-operational, mode-A, using a 2-meter uplink and a 10-meter
downlink.
=====
FO-20 JAS-1b
Catalog number: 20480
Launch Date: February 07, 1990
Uplink: 145.90 to 146.00 MHz CW/LSB
Downlink: 435.80 to 435.90 MHz CW/USB
Beacon: 435.795
Status: Semi-Operational. FO-20 is in mode JA continuously.
=====
AO-27 AMRAD
Catalog number: 22825
Launched: September 26, 1993
Uplink: 145.850 MHz FM
Downlink: 436.795 MHz FM
Status: Operational
Off the AO-27 webpage at http://www.ao27.org:
February 6th, 2004 UTC
The on-board watchdogs have turned the scheduler off. This was expected
as the
last few days of telemetry have shown lower battery voltages. We will be
downloading the Whole Orbit Data and looking at why the voltage is lower. I
will send a new schedule up as soon as we know what happened. Keep in mind
that AO-27 is in its 11th year on orbit. If you hear the telemetry, please
don't try to uplink, you will only cause interference to the command
stations
The latest information on AO-27 from control operator Michael Wyrick,
N3UC (former N4USI), can be found at: http://www.ao27.org
An AO-27 question-and-answer page is available on the AMSAT-NA web
site, with updates by Ray, W2RS. The URL is:
http://www.amsat.org/amsat/intro/ao27faq.html
[ANS thanks Micheal, N3UC and AMRAD for AO-27 information] [02082004]
=====
FO-29 JAS-2
Catalog number: 24278
Launch Date: August 17, 1996
Voice/CW Mode JA
Uplink: 145.90 to 146.00 MHz CW/LSB
Downlink: 435.80 to 435.90 MHz CW/USB
Beacon: 435.795 MHz
Digital Mode JD
Uplink: 145.850 145.870 145.910 MHz FM
Downlink: 435.910 MHz 1200-baud BPSK or 9600-baud FSK
Callsign: 8J1JCS
Digitalker: 435.910 MHz
Status: Operational Mode JA.
Mineo, JE9PEL, has an FO-29 satellite telemetry analysis program that
will automatically analyze all digital telemetry from the satellite
(such as current, voltage and temperature). FO29CWTE is available at:
http://www.ne.jp/asahi/hamradio/je9pel/
=====
SO-41 SAUDISAT-1A
Launch Date: September 26, 2000
Catalog number: 26545
Uplink: 145.850 MHz
Downlink: 436.775 MHz
Broadcast Callsign: SASAT1-11
BBS: SASAT1-12
Status: Operational
Further information is available at:
http://www.amsat.org/amsat/sats/n7hpr/so41.html
=====
SO-50 SAUDISAT-1C
Catalog number: 27607
Launched: December 20, 2002
Uplink: 145.850 MHz (67.0 Hz PL tone)
Downlink: 436.795 MHz
Status: Operational.
SO-50 carries several experiments, including a mode J FM amateur repeater
experiment operating on 145.850 MHz uplink and 436.800 MHz downlink.
The repeater is available to amateurs worldwide as power permits, using a
67.0 Hertz tone on the uplink, for on-demand activation.
[ANS thanks Turki Al-Saud for this information]
NNNN
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