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1994-03-20
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SB SAT @ AMSAT $ANS-078.01
PHASE-3D STATUS REPORT
HR AMSAT NEWS SERVICE BULLETIN 078.01 FROM AMSAT HQ
SILVER SPRING, MD MARCH 19, 1994
TO ALL RADIO AMATEURS BT
BID: $ANS-078.01
AMSAT PHASE 3-D INTERNATIONAL SATELLITE BUILDERS MEET IN
MARBURG--PROPELLANT TANKS DELIVERED
During the week of February 10-16, 1994, Dr. Karl Meinzer, DJ4ZC,
AMSAT-DL President and Project Leader for the International AMSAT Phase-3D
satellite, and Werner Haas, DJ5KQ, Vice-President of AMSAT-DL hosted
a working meeting in Marburg, Germany to discuss recent progress on the
project. Agenda items centered primarily around the spacecraft's
electronic systems including the on-board computer (IHU) and RUDAK
systems, as well as the progress now being made by team members on the
spacecraft's other electronic modules.
Also during the meeting, the team took delivery of P3-D's main
propellant tanks. The tanks were manufactured in Russia under contract
from AMSAT-DL and in accordance with AMSAT specifications. Seven tanks
were delivered, although one had been subjected to a destructive pressure
test by its Russian manufacturer.
Not only have all the propellant tank specifications been fully
achieved, but they've actually been significantly surpassed. Each tank
can accommodate almost 50 liters of propellant. Favorable conditions for
the purchase and delivery of these tanks was arranged through the efforts
of AMSAT-UA (Russia). Following a brief inspection, the tanks were
immediately shipped to Orlando, Florida, where integration of the
satellite is now slated to begin this summer.
Dick Jansson, WD4FAB, AMSAT-NA Vice-President for Engineering, also
attended the meeting, principally to discuss various aspects of the
satellite's structure with Dr. Meinzer and Konrad Mueller, DG7FDQ. He
reported on the good progress of the flight model structure's construc-
tion, currently underway at Weber State University in Utah.
Also in attendance were Lyle Johnson, WA7GXD, Peter Guelzow, DB2OS, and
Gerhard Metz, DG2CV. Lyle is known through his work with the Tucson
Amateur Packet Radio (TAPR) group (which he co-founded) as well as for
his work on the Microsats and on the P3-D GPS project. After much
discussion, the team decided to again employ a cable wiring harness
arrangement for Phase 3-D, similar to that used on AO-10 and AO-13,
rather than an AART-based LAN design. However, the team decided to also
fly a CAN bus and DB2OS's experimental LAN controller as part of the
spacecraft's digital (RUDAK) transponder.
In a related decision, the group concluded that the AO-10/AO-13
1802-based Internal Housekeeping Unit (IHU) computer design would still
be adequate for P3-D with some minor modifications. Lyle Johnson
announced his willingness to redesign the IHU and to construct a flight
unit. His offer was greatfully accepted.
Other meeting items centered on P3-D's RUDAK work now being done by
Peter Guelzow, Gerhard Metz, and Dr. Stefan Eckart, DL2MDL. This team
has now decided to build two RUDAKs. The first will be a user-oriented
digital communications module constructed by Lyle Johnson, in close
cooperation with Peter Guelzow. This RUDAK, which has yet to be formally
named, will be the one most P3-D satellite users will operate. A second,
more experimental RUDAK (called RUDAK-E), will be built in Germany. It
will promote experiments with advanced high speed modems, Digital Signal
Processing (DSP) techniques, and new communications protocols.
In a host of other issues, Daniel Orban, ON4AOD, discussed details
of the 24 GHz transmitter. Konrad Hupfer, DJ1EE, reported his progress
in building the 250 watt U-Band (70 cm) final amplifier. Werner Haas
displayed his first flight hardware consisting of two command receivers,
a digital section, and the 70 cm exciter that will drive Konrad's 70 cm
final amplifier. Freddy de Guchteneirie, ON6UG, reported his progress on
the construction of dual V-Band and U-Band receiver "front-ends". Dr.
Matjaz Vidmar, S51MV, reported he has now begun construction of the
HF-Band, C-Band and S-Band receivers. He expects to deliver working
prototypes in May.
While much work still remains to be done, Dr. Meinzer expressed his
approval and sincere thanks to all participants for their superb work and
close cooperation on this vitally important AMSAT international project.
A complete text of this meeting's minutes has been prepared by Peter
Guelzow, and has since been translated by Don Moe, DJ0HC/KE6MN. The text
will be made available to the various international AMSAT Journals for
possible inclusion in their upcoming editions.
[The AMSAT News Service (ANS) would like to thank Peter Guelzow, DB2OS, Don
Moe, DJ0HC/KE6MN, Lyle Johnson, WA7GXD, and Keith Baker, KB1SF, for their
assistance in writing, translating, and formatting the information
contained in this bulletin item.]
/EX
SB SAT @ AMSAT $ANS-078.02
ITAMSAT-OSCAR-26 PROBLEM
HR AMSAT NEWS SERVICE BULLETIN 078.02 FROM AMSAT HQ
SILVER SPRING, MD MARCH 19, 1994
TO ALL RADIO AMATEURS BT
BID: $ANS-078.02
ITAMSAT-OSCAR-26 (IO-26) Ground Team Discovers Problem
Starting last week the PSK modulation on the primary trasmitter became more
and more difficult to decode. A residual carrier and lower output power
seem to indicate a failure in the PSK balanced modulator, being worse at
the current low power setting. Increasing the power level makes the de-
modulation better but is not accetable due to power budget constraints.
Ground controllers decided to switch to the secondary PSK trasmitter on
435.822 MHz. The first two passes over Italy confirmed the correct
operation of the spacecraft and WOD are being taken to analize the per-
formance of the satellite in this new configuration. BBS is working as
usual and status bulletin will be uploaded in the next few days.
73 de ITAMSAT (IO-26) Command Team
/EX
SB SAT @ AMSAT $ANS-078.03
AO-13 OPERATIONS NET SCHEDS
HR AMSAT NEWS SERVICE BULLETIN 078.03 FROM AMSAT HQ
SILVER SPRING, MD MARCH 19, 1994
TO ALL RADIO AMATEURS BT
BID: $ANS-078.03
Current AMSAT Operations Net Schedule For AO-13
AMSAT Operations Nets are planned for the following times. Mode-B Nets
are conducted on AO-13 on a downlink frequency of 145.950 MHz. If, at
the start of the OPS Net, the frequency of 145.950 MHz is being used
for a QSO, OPS Net enthusiasts are asked to move to the alternate
frequency of 145.955 MHz.
Date UTC Mode Phs NCS Alt NCS
26-Mar-94 2130 B 084 WA5ZIB W5IU
Any stations with information on current events would be most welcomed.
Also, those interested in discussing technical issues or who have questions
about any particular aspect of OSCAR statellite operations, are encouraged
to join the OPS Nets. If neither of the Net Control Stations show up, any
participant is invited to act as the NCS.
AO-13 ZRO Tests For March 1994
The following schedule of Mode "B" tests were chosen for convenient
operating times and favorable squint angles. The tests can be heard on
145.840 MHz. Andy McAlister (WA5ZIB) will conduct all the tests. Mode
"JL" tests will no longer occur due to the failure of AO-13's 70CM trans-
mitter.
Day Date (UTC) Time Areas covered
Saturday Mar. 26, 1994 2315 UTC NA, SA
Note that the dates and days are shown in "UTC". Any changes will be
announced as soon as possible via the AMSAT HF and AO-13 Operations
Nets.
All listener reports with date of test and numbers copied should be sent to
Andy McAllister (WA5ZIB), AMSAT V.P. User Operations, 14714 Knights Way
Drive, Houston, TX 77083-5640. A report will be returned verifying the
level of accurate reception. An S.A.S.E. is appreciated but not required.
SSTV ON OSCAR 13
Slow scanners are invited to join the SSTV sessions on AO-13. The freq-
uency is 145.955 MHz. The net meets at 45 minutes before Mode S, and on
Mode B following Mode S on Saturdays and Sundays. Join those sessions or
convey your wishes for other skeds to wb6llo@amsat.org, and he will
coordinate your efforts.
/EX
SB SAT @ AMSAT $ANS-078.04
SAREX STS-59 CORRECTION
HR AMSAT NEWS SERVICE BULLETIN 078.04 FROM AMSAT HQ
SILVER SPRING, MD MARCH 19, 1994
TO ALL RADIO AMATEURS BT
BID: $ANS-078.04
Correction To NASA Landline BBS Phone Number
Last week's AMSAT News Service (ANS) ANS-071.02 bulletin referred to the
NASA Info Board BBS at Johnson Space Center as a source of information for
Keplerian elements and SAREX bulletins. This bulletin board system was
operated and maintained by the Public Affairs Office of the Johnson Space
Center and is now no longer operational.
Johnson Space Center Amateur Radio Club is currently seeking a way to get a
small BBS up and running prior to the flight. As soon as a system is
established, an announcement will be issued to promulgate and distribute
the telephone number.
73,
Dale Martin, KG5U @ KA5KTH.#setx.tx.usa.na
Sec'y, Johnson Space Center ARC
Houston, Texas
/EX
SB SAT @ AMSAT $ANS-078.05
WEEKLY OSCAR STATUS REPORTS
HR AMSAT NEWS SERVICE BULLETIN 078.05 FROM AMSAT HQ
SILVER SPRING, MD MARCH 19, 1994
TO ALL RADIO AMATEURS BT
BID: $ANS-078.05
Weekly OSCAR Status Reports: 19-MAR-94
AO-13: Current Transponder Operating Schedule:
M QST *** AO-13 TRANSPONDER SCHEDULE *** 1994 Mar 19-Apr 04
Mode-B : MA 0 to MA 90 |
Mode-BS : MA 90 to MA 120 |
Mode-S : MA 120 to MA 122 |<- S beacon only
Mode-S : MA 122 to MA 145 |<- S transponder; B trsp. is OFF
Mode-S : MA 145 to MA 150 |<- S beacon only
Mode-BS : MA 150 to MA 180 | Alon/Alat 180/0
Mode-B : MA 180 to MA 256 |
Omnis : MA 230 to MA 30 | Move to attitude 235/0, Apr 04 240/0, Apr 04
[G3RUH/DB2OS/VK5AGR]
FO-20: The following is the current schedule for transponder operations:
ANALOG MODE:
23-MAR-94 7:52 -TO- 30-MAR-94 8:15 UTC
DIGITAL MODE: Unless otherwise noted above.
[Kazu Sakamoto (JJ1WTK) qga02014@niftyserve.or.jp]
AO-16: Operating normally. [WH6I]
LO-19: Operating normally. [WH6I]
IO-26: Operating normally. [WH6I]
KO-23: Operating normally. [WH6I]
The AMSAT NEWS Service (ANS) is looking for volunteers to contribute weekly
OSCAR status reports. If you have a favorite OSCAR which you work on a
regular basis and would like to contribute to this bulletin, please send
your observations to WD0HHU at his CompuServe address of 70524,2272, on
INTERNET at wd0hhu@amsat.org, or to his local packet BBS in the Denver, CO
area, WD0HHU @ W0LJF.#NECO.CO.USA.NOAM. Also, if you find that the current
set of orbital elements are not generating the correct AOS/LOS times at
your QTH, PLEASE INCLUDE THAT INFORMATION AS WELL. The information you
provide will be of value to all OSCAR enthusiasts.
/EX