AMSAT-NA

AMSAT News Service
Weekly Satellite Report

May 20, 2001

ISS . RS-12 . RS-13 . RS-15 . AO-10 . UO-11 . UO-14 . AO-16 . DO-17 . WO-18 . LO-19 . FO-20 . UO-22 . KO-23 . KO-25 . IO-26 . AO-27 . FO-29 . TO-31 . GO-32 . SO-33 . PO-34 . SO-35 . UO-36 . AO-40 . SO-41 . SO-42

ANS News Bulletins for this date
Subscribe to bulletins by e-mail
Submit your News for ANS


Phase 3D / AMSAT-OSCAR 40 / AO-40

Launched: November 16, 2000 aboard an Ariane 5 launcher from Kourou, French Guiana.
Status: S-Band transmitter is active.

The RUDAK system has been activated. The RUDAK-A processor is sending telemetry and a pass-through of the IHU downlink information on its own downlink at 2401.72 MHz.

AO-40 experimental transponder operation started on May 5, 2001 at approximately 08:00 UTC when the U-band and L1-band uplinks were connected to the S-2 transmitter passband downlink via the matrix switch. This is experimental transponder operation and as such the transponders may be shut off at any time without warning and the schedule may change without prior notice.

DX continues to be heard and worked on AO-40. Charlie, VR2XMT, reports contacts with 7N1JVW, JH1NPQ, HL5OC,VK4AFL, ZL1AOX, JA0BBW, I8CVS and JH2ESW. "Signals are very strong, normally 5x7 both way," said Charlie.

Note: +/- 5 kHz around the Middle Beacon (MB) must be avoided. If the beacon cannot be copied due to interference with users in the passband, the passband may be disconnected and transponder operation stopped.

It is also planned to test the U-band and V-band transmitters again when squint angles allow good visibility.

The uplink frequencies are 435.550-435.800 MHz and 1269.250 to 1269.500 MHz. The downlink passband is 2401.225-2401.475 MHz. The transponders are inverting, so a downward change in uplink frequency will result in an upward frequency shift in the downlink.

[ANS thanks AMSAT-NA, AMSAT-DL and the ARRL for this information]

International Space Station/ARISS

Worldwide packet uplink: 145.990 MHz
Region 1 voice uplink: 145.200 MHz
Region 2/3 voice uplink: 144.490 MHz
Worldwide downlink: 145.800 MHz
TNC callsign NOCALL
ARISS initial station launched September 2000 aboard shuttle Atlantis

ARISS is made up of delegates from major national amateur radio organizations, including AMSAT.

Status: Operational. Voice contacts with ISS have been made recently. The ISS packet station is available for UI packets (APRS or UI QSL). The mailbox and keyboard are currently disabled. Please see the packet section of the ARISS web page before attempting to first work ISS on packet.

U.S. callsign: NA1SS
Russian callsigns: RS0ISS, RZ3DZR

Jim Voss recently completed a contact with students from Parkway Central High School near St. Louis. Exactly 20 questions were asked with 19 answers from Jim. "The students were grinning from ear-to-ear and a good time was had by all," reported Rick, KB0VBZ.

The QSL routes for W/VE stations working NA1SS aboard the International Space Station:

U.S stations: Margie Bourgoin KB1DCO
Attn: ARISS Expedition-1 (or 2) QSL
ARRL, 225 Main Street
Newington, Connecticut 06111
Canadian stations: Radio Amateurs of Canada
Attn: ARISS Expedition-1 (or 2) QSL
720 Belfast Road, Suite 217
Ottawa, Ontario K1G 0Z5

A self-addressed, stamped envelope is required to get a QSL in return. The ARISS international group has not yet finalized a QSL card design. It will be a few months before cards become available.

More information about the project can be found on the ARISS web site at http://ariss.gsfc.nasa.gov/.

[ANS thanks ARISS team member Will Marchant, KC6ROL, for this information]

RS-12

Uplink 145.910 to 145.950 MHz CW/SSB
Downlink 29.410 to 29.450 MHz CW/SSB
Beacon 29.408 MHz
Launched February 5, 1991 aboard a Russian Cosmos C launcher

Status: RS-12 was re-activated in mode A on January 1, 2001

The latest information on RS-12 and RS-13 can be found on the AC5DK RS-12/13 Satellite Operators page:

http://www.qsl.net/ac5dk/rs1213/rs1213.html

[ANS thanks Kevin Manzer, AC5DK, for RS-12 information]

RS-15

Uplink 145.858 to 145.898 MHz CW/SSB
Downlink 29.354 to 29.394 MHz CW/SSB
Beacon 29.352 MHz (intermittent)
SSB meeting frequency 29.380 MHz (unofficial)
Launched December 26, 1994 from the Baikonur Cosmodrome
Semi-operational, Mode A (2m uplink, 10m downlink)

Dave, WB6LLO, has operating information for both RS-15 and RS-13 on his personal web site. In addition to satellite data, antenna information for mode A operation is also featured. The WB6LLO web site URL is http://home.san.rr.com/doguimont/uploads

AO-10

Uplink 435.030 to 435.180 MHz CW/LSB
Downlink 145.975 to 145.825 MHz CW/USB
Beacon 145.810 MHz (unmodulated carrier)
Launched June 16, 1983 by an Ariane launcher from Kourou, French Guiana
Semi-operational.

DX continues to be heard and worked on AO-10. Noel, 4S7AVR, reports several contacts on AO-10 including 9V1XE, MG2HSF, and UT4MUS.

Stacey Mills, W4SM, has more information about the satellite at http://www.cstone.net/~w4sm/AO-10.html

[ANS thanks Stacey Mills, W4SM, for his AO-10 status information and web site]

AO-27

Uplink 145.850 MHz FM
Downlink 436.795 MHz FM
Launched September 26, 1993 by an Ariane launcher from Kourou, French Guiana
Operational

Periodically, AO-27's analog repeater will be turned off for a few days at a time to enable ground controllers to gather Whole Orbital Data (WOD), to verify the health of the satellite.

An AO-27 question-and-answer page is available on the AMSAT-NA web site: http://www.amsat.org/amsat/intro/ao27faq.html.

AO-27 uses a method called Timed Eclipse Power Regulation (TEPR) to regulate the on-board batteries. In simple terms, TEPR times how long the satellite has been in an eclipse (or in the sun) and decides what subsystems to turn on or off.

TEPR states on AO-27 were reset on March 24, 2001 as follows:

TEPR 4 = 38
TEPR 5 = 78
TEPR 5 is now 20 minutes long.

The AO-27 pages on the AMSAT-NA web site include an explanation of TEPR AO-27 operations at http://www.amsat.org/amsat/sats/n7hpr/ao27.html

[ANS thanks AMRAD for AO-27 information]

UO-14

Uplink 145.975 MHz FM
Downlink 435.070 MHz FM
Launched January 22, 1990 by an Ariane launcher from Kourou, French Guiana
Operational.

Tim, KG8OC, features UO-14 information on the Michigan AMSAT web site, see http://www.qsl.net/kg8oc

[ANS thanks Chris Jackson, G7UPN / ZL2TPO, for UO-14 information]

JAS-1b FO-20

Uplink 145.900 to 146.000 MHz CW/LSB
Downlink 435.800 to 435.900 MHz CW/USB
Launched February 7, 1990 by an H1 launcher from the Tanegashima Space Center in Japan
Operational.

FO-20 is in mode JA continuously.

Tak, JA2PKI, reported FO-20 control station operators believe that the UVC (Under Voltage Controller) now is regulating the transponder. The UVC monitors battery voltage and tries to protect the batteries from over discharge.

[ANS thanks Kazu Sakamoto, JJ1WTK for the FO-20 status reports]

JAS-2 FO-29

Voice/CW Mode JA
Uplink 145.900 to 146.000 MHz CW/LSB
Downlink 435.800 to 435.900 MHz CW/USB
Digital Mode JD
Uplink 145.850, 145.870, 145.910 MHz FM
Downlink 435.910 MHz FM 9600 baud BPSK
Callsign 8J1JCS
Digi-talker Mode
Downlink 435.910 MHz FM
Launched August 17, 1996, by an H-2 launcher from the Tanegashima Space Center in Japan
Operational.

The JARL FO-29 command station has announced the following operation schedule of FO-29:

through July 2 JA

Mineo, JE9PEL, has updated his FO-29 satellite telemetry analysis program. The software will automatically analyze all digital telemetry from the satellite such as current, voltage and temperature. The JE9PEL FO-29/software update is available at http://www.ne.jp/asahi/hamradio/je9pel/

[ANS thanks Kazu Sakamoto, JJ1WTK, for the FO-29 status reports]

TIUNGSAT-1

Uplink 145.850 or 145.925 MHz 9600 baud FSK
Downlink 437.325 MHz
Broadcast callsign: MYSAT3-11
BBS: MYSAT3-12
NUP: MYSAT3-10
Launched September 26, 2000 aboard a converted Soviet ballistic missile from the Baikonur Cosmodrome
Status: Operational at 38k4 baud FSK

Paul, KB2SHU, reports that he has not copied the satellite since early May.

Chris, G7UPN, tells ANS that TiungSat-1 has been operating at a data rate of 38k4. Data recovery at 38k4 is reported to be extremely good with efficiencies near 100%. The output power is at 8 watts "which should provide a very good downlink," said Chris, adding "the downside is that with the high power transmitter operating, the power budget is negative so we can't support continuous operation."

According to G7UPN, TiungSat-1 now requires the amateur radio station to switch the downlink 'on' when the satellite comes into range. The way this works is for the ground station software to send a request to the spacecraft to switch the downlink on. The spacecraft receives this request and checks the battery voltage to see if it can support the operation, and if it can it will activate the downlink.

TiungSat-1 is Malaysia's first micro-satellite and in addition to commercial land and weather imaging payloads will offer FM and FSK amateur radio communication.

TiungSat-1, named after the mynah bird of Malaysia, was developed as a collaborative effort between the Malaysian government and Surrey Satellite Technology Ltd.

For more information on TiungSat-1, see http://www.yellowpages.com.my/tiungsat/tiung_main.htm

KO-25

Uplink 145.980 MHz FM
Downlink 436.500 MHz FM, 9600 Baud FSK
Broadcast callsign: HL02-11
BBS: HL02-12
Launched September 26, 1993 by an Ariane launcher from Kourou, French Guiana
Operational.

Jim, AA7KC, last reported KO-25 to be operational with low traffic and low downlink efficiency.

UO-22

Uplink 145.900 or 145.975 MHz FM
Downlink 435.120 MHz FM 9600 Baud FSK
Broadcast callsign: UOSAT5-11
BBS: UOSAT5-12
Launched July 17, 1991 by an Ariane launcher from Kourou, French Guiana
Operational

Jim, AA7KC, last reported UO-22 is operational with heavy individual and Sat-gate traffic. Gateways from Spain, France, Brazil, South Africa, Greece, the United States and Chile use this satellite daily - which demonstrates the international use of this satellite. Downlink efficiencies are in the high 90% range.

More information on the satellite is available at http://www.sstl.co.uk/

[ANS thanks Chris Jackson, G7UPN/ZL2TPO, for UO-22 information and Jim Weisenberger, AA7KC, for status information]

OSCAR-11

Downlink 145.825 MHz FM, 1200 baud PSK
Beacon 2401.500 MHz
Launched March 1, 1994 by a Delta-Thor rocket from Vandenberg Air Force Base in California
Operational.

Clive Wallis, G3CWV, reports during the period of 17-April to 15-May, reliable signals have been received from the 145 MHz beacon. The battery voltage observed during daylight passes has continued to decrease. The average value observed was 13.4 with a range of 13.2 to 13.7 volts. The internal temperatures have continued to decrease by another one degree C. They are now 0.8C and -0.6C for battery and telemetry electronics respectively.

The WOD survey of channels 1, 2, 3, 61 (X, Z, Y magnetometers and status) dated 24-March, has been transmitted.

The spin period has varied between 305 and 348 seconds. The attitude control appears to be working normally since the counters were reset by ground control.

The mode-S beacon has been heard by Jerry, K5OE, and Ken, G0RVH.

Users of OSCAR-11 should note that the hardware generated time in the ASCII telemetry is now 15.5 minutes ahead of UTC, and the date is three days advanced. Unfortunately these errors cannot be corrected.

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.

More information on OSCAR-11 is available at http://www.users.zetnet.co.uk/clivew/

[ANS thanks Clive Wallis, G3CWV, for OSCAR-11 status information]

AMSAT-OSCAR-16 (PACSAT)

Uplink 145.900, 145.920, 145.940, 145.860 MHz FM, 1200 bps Manchester FSK
Downlink 437.025 MHz SSB, 1200 bps RC-BPSK 1200 Baud PSK
Beacon 2401.1428 MHz.
Broadcast callsign: PACSAT-11
BBS: PACSAT-12
Launched January 22, 1990 by an Ariane launcher from Kourou, French Guiana
Semi-operational. Digipeater on.

Telemetry was as follows:

uptime is 460/18:13:11.  Time is Fri May 18 21:50:15 2001
+10V Bus         9.900 V  PSK TX RF Out    0.747 W
Bat 1 V          1.183 V  Bat 2 V          1.135 V
Bat 3 V          1.166 V  Bat 4 V          1.224 V
Bat 5 V          1.119 V  Bat 6 V          1.134 V
Bat 7 V          1.158 V  Bat 8 V          1.216 V
Bat 1 Temp       3.024 D  Bat 2 Temp       3.024 D
Baseplt Temp     3.024 D  RC PSK BP Temp  -6.053 D
RC PSK HPA Tmp  -5.448 D  +Y Array Temp  -24.811 D
PSK TX HPA Tmp  -3.027 D  +Z Array Temp  -15.129 D
Total Array C= 0.000 Bat Ch Cur=-0.300 Ifb= 0.168 I+10V= 0.152
TX:1006 BCR:1E PWRC:36D BT:1E WC:25 EDAC:E9

A new WOD collection of current graphics along with general information and telemetry samples can be found at http://www.telecable.es/personales/ea1bcu

[ANS thanks Miguel A. Menendez, EA1BCU, for AO-16 status information.]

UoSAT-12 UO-36

Uplink 145.960 MHz, 9600 baud FSK
Downlink 437.025, 437.400 MHz, 9600 baud FSK
Broadcast callsign: UO121-11
BBS: UO121-12
Launched April 21, 1999 by a Russian launcher from the Baikonur Cosmodrome
Status: Operational

UO-36 carries a number of imaging payloads, digital store-and-forward communications and mode L/S transponders.

NASA has demonstrated on UO-36 the ability to use standard Internet protocols to communicate with an orbiting spacecraft (just like any node on the Internet). NASA has been developing this project by working with the commercial payload aboard UoSAT-12.

The BBS is open, although uploading and downloading may be disabled at times.

The VK5HI viewer shareware for UO-36 is available on the AMSAT-NA web site at ftp://ftp.amsat.org/amsat/software/win32/display/ccddsp97-119.zip

Further information on UO-36 is available from: http://www.sstl.co.uk/

[ANS thanks Chris G7UPN/ZL2TPO, and the University of Surrey, for this information]

ITAMSAT IO-26

Uplink 145.875, 145.900, 145.925, 145.950 MHz FM
Downlink 435.822 MHz SSB, 1200 Baud PSK
Broadcast callsign: ITMSAT-11
BBS: ITMSAT-12
Launched September 26, 1993 by an Ariane launcher from Kourou, French Guiana
Semi-operational.

Digipeater function is on, open for APRS users.

[ANS thanks ITAMSAT Project Manager Alberto E. Zagni, I2KBD, for this information]

The following satellites are in orbit but are non-operational at this time:

TMSAT-1 TO-31

Uplink 145.925 MHz 9600 baud FSK
Downlink 436.925 MHz 9600 baud FSK
Broadcast callsign: TMSAT1-11
BBS: TMSAT1-12
Launched July 10, 1998 by a Zenit rocket from the Baikonur Cosmodrome
Status: Non-operational, no data downlinked since December 18, 2000

Jim, AA7KC, reported recently to ANS that TO-31 has been non-operational over North America for the past six months.

Chris G7UPN, (UoSAT operations manager) reports the following to ANS:

The TO-31 downlink will be off over most areas, with the exception of Europe and Thailand. This is required to allow control stations to recondition the battery with minimum power drain.

ProcMail V2.00G has been released by G7UPN. This software permits the processing of image files from TO-31. It has been posted to the AMSAT-NA FTP site at http://www.amsat.org/amsat/software/win32/wisp

Many of the high-resolution color images transmitted by TMSAT are compressed using a UoSAT compression format. This format is supported by the VK5HI CCD display program.

[ANS thanks Chris Jackson, G7UPN/ZL2TPO, for TO-31 status information]

LUSAT-OSCAR-19

Uplink 145.840, 145.860, 145.880, 145.900 MHz 1200 bps Manchester FSK
Downlink 437.150 MHz SSB, 1200 bps RC-BPSK
CW Downlink 437.125 MHz
Broadcast callsign: LUSAT-11
BBS: LUSAT-12
Launched January 22, 1990 by an Ariane launcher from Kourou, French Guiana
Semi-operational.

The CW beacon is sending eight telemetry channels and one status channel on 437.126 MHz. No BBS service is available. The digipeater is not active.

Telemetry (limited) is as follows:

Sat Time is Fri Apr 20 20:59:04 2001
LUSAT HIHI 60 AUN ADT AVB ADV AUB A66 A6U AE6

Mineo, JE9PEL, has recorded LO-19 CW and PSK telemetry and placed the information on his Internet homepage site at http://www.ne.jp/asahi/hamradio/je9pel/

General information and telemetry samples can be found at http://www.telecable.es/personales/ea1bcu

[ANS thanks Miguel A. Menendez, EA1BCU, for LO-19 status information.]

SO-41 SAUDISAT-1A

Uplink to be released
Downlink 437.075 MHz
Launched September 26, 2000 aboard a converted Soviet ballistic missile from the Baikonur Cosmodrome
Status: Unknown, this satellite has been in orbit for almost eight months. ANS has received no additional information.

When/if operational, SaudiSat-1A will operate as 9600-baud digital store-and-forward systems as well analog FM repeater mode capability. One of two new ham satellites from the Kingdom of Saudi Arabia built by the Space Research Institute at the King Abdulaziz City for Science and Technology.

SO-42 SAUDISAT-1B

Uplink to be released
Downlink 436.775 MHz
Launched September 26, 2000 aboard a converted Soviet ballistic missile from the Baikonur Cosmodrome
Status: Unknown, this satellite has been in orbit for almost eight months. ANS has received no additional information.

When/if operational, SaudiSat-1B will operate as 9600-baud digital store-and-forward systems as well analog FM repeater mode capability. One of two new ham satellites from the Kingdom of Saudi Arabia built by the Space Research Institute at the King Abdulaziz City for Science and Technology.

SunSat SO-35

Mode J uplink 145.825 MHz FM
Mode J downlink 436.250 MHz FM

Mode B uplink 436.291 MHz FM
Mode B downlink 145.825 MHz FM

Launched February 23, 1999 by a Delta II rocket from Vandenberg Air Force Base in California
Status: Non-operational

The SunSat team released the following statement, dated February 1, 2001:

We regret to announce that the last communication with SunSat from our ground station at the Electronic Systems Laboratory at Stellenbosch University took place recently. We are certain, after having performed several tests since the last contact, that an irreversible, physical failure has occurred on the satellite. It is therefore unlikely that we will have any further contact with SunSat, apart from the occasional visual sighting by telescope!

When it was operational the SunSat package included 1200 and 9600 baud digital store-and-forward capability and a voice 'parrot' repeater system in addition to Mode B/J operation with two VHF and two UHF transmit-receive systems.

For more information on SunSat, visit http://sunsat.ee.sun.ac.za/

[ANS thanks Garth Milne ZR1AFH, for this information]

RS-13

Uplink 21.260 to 21.300 MHz CW/SSB
Downlink 145.860 to 145.900 MHz CW/SSB
Beacon 145.860 MHz
Launched February 5, 1991 aboard a Russian Cosmos C launcher

Status: non-operational (last operational in mode-T)

RS-12 was re-activated recently. Prior to this switch RS-13 was operational (mode T), but was apparently turned off following the recent RS-12 switch.

The latest information on RS-12 and RS-13 can be found on the AC5DK RS-12/13 Satellite Operators page at http://www.qsl.net/ac5dk/rs1213/rs1213.html

[ANS thanks Kevin Manzer, AC5DK, for this information]

KITSAT KO-23

Uplink 145.850, 145.900 MHz FM
Downlink 435.175 MHz FM, 9600 Baud FSK
Broadcast callsign: HL01-11
BBS: HL01-12
Launched August 10, 1992 by an Ariane launcher from Kourou, French Guiana
Status: Intermittent operation with the downlink transmitter operating at unpredictable intervals

Jim, AA7KC, reported that KO-23's downlink transmitter continues in non-operational status. Jim says that KO-23 shows some signs of trying to recover, but no useful data has been downlinked. The duration of this status is unpredictable. No data has been received since October 28, 2000.

KyungHee Kim, HL0ENJ, reports (from the KO-23 control team) that part of the problem with non-operation has been the power budget aboard the satellite. "We are not sure when the bird might turn off again due to insufficient power. The capability of the onboard power system has been less and less," said Kim. HL0ENJ also noted that as of October 30, 2000 the onboard computer was reset and a reboot of operational software is now underway.

[ANS thanks Jim Weisenberger, AA7KC, and KyungHee Kim, HL0ENJ, for KO-23 status information]

TechSat-1B GO-32

Downlink 435.225 MHz, HDLC telemetry
Launched July 10, 1998 by a Russian Zenit rocket from the Baikonur Cosmodrome
Semi-operational.

Efforts were reported to be underway to bring GO-32 on line, however no additional information has been received by ANS (the last report was dated November 1999).

Last reported, the satellite does transmit a 9600-baud burst every 30 seconds (the GO-32 beacon sends one short telemetry status transmission of 44 bytes) and, upon request, the complete telemetry buffer.

ANS has no further information.

PANSAT PO-34

Uplink/downlink frequency (listed on the PanSat web site) 436.500 MHz
Launched October 30, 1998 by the Shuttle Discovery
Status: unknown

The satellite is not available for general uplink transmissions.

The Naval Postgraduate School developed PanSat. At the time of launch, PanSat spread-spectrum digital transponders were promised to be available to amateur radio operators along with software to utilize this technology. To date, this has not happened.

For more information, visit the official PANSAT web site at:

http://www.sp.nps.navy.mil/pansat/

PanSat was the featured cover article in the July/August 1999 issue of the AMSAT-NA Journal (written by KD6DRA and N7HPR).

ANS has no further information.

DO-17 (DOVE)

Downlink 145.825 MHz FM, 1200 Baud AFSK
Beacon 2401.220 MHz
Launched January 22, 1990 by an Ariane launcher from Kourou, French Guiana
Non-operational.

DOVE stopped transmitting in March 1998. The 145.825 MHz and 2401.220 MHz downlinks are off the air and the satellite has not responded to ground station control.

ANS has no further information.

WEBERSAT (WO-18)

Downlink 437.104 MHz SSB, 1200 Baud PSK AX.25
Launched January 22, 1990 by an Ariane launcher from Kourou, French Guiana
Non-operational.

WO-18 has been in orbit for 11 years.

WO-18 was last reported to be in MBL mode after a software crash.

ANS has no further information.

SEDSAT SO-33

Downlink 437.910 MHz FM 9600 Baud FSK
Launched October 24, 1998 by a Delta 2 rocket from Cape Canaveral in Florida
Semi-operational.

The satellite is not currently available for uplink transmissions and image and transponder recovery efforts have been unsuccessful.

SEDSAT-1 signifies Students for the Exploration and Development of Space (satellite number one).

SedSat-1 has downlinked months worth of telemetry data on the performance of its electrical power system parameters. The Nickel Metal Hydride batteries on the spacecraft were experimental and experienced some abuse due to a power negative situation. This information has provided NASA with useful information. With the exception of the imaging system and the use of the transponders, SedSat-1 has been judged a success.

For more information on SedSat-1 visit the satellite web site at http://www.seds.org/sedsat

ANS has no further information.


ANS would like to thank Mike Seguin, N1JEZ, ANS principal satellite investigator, for helping provide current satellite information for ANS.

Please send any amateur satellite news or reports to the ANS Editors at ans-editor@amsat.org, or to ANS Editor Dan James, NN0DJ, at nn0dj@amsat.org.

Return to top


This week's AMSAT News Service bulletins were edited by AMSAT  News Service editor Dan James, NN0DJ.

AMSAT Top