HAMSAT: Difference between revisions

**HAMSAT**
Organization	AMSAT-India, William Leijenaar http://amsatindia.org/
Mission Type	Communications
Satellite of	Earth
Launch	May 5, 2005 on PSLV-C6
Launch site	Sriharikota
Mission duration	Achieved: 9 Years and 2 Months
Mass	42.5 kg (launch)
Orbital elements
Semi-major axis	7004.27 km
Eccentricity	0.0027
Inclination	97.89 degrees
Orbital Period	97.23 minutes
Right ascension of the ascending node	65.14 degrees
Argument of perigee	222.72 degrees

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HAMSAT also known as HAMSAT INDIA, VU2SAT and VO-52 is a microsatellite weighing 42.5 kilograms (93.7 lb), providing amateur radio satellite communications services for Indian and international amateur radio operators. This satellite carries the in-orbit designation of VO-52, and is an OSCAR series satellite.

History

It was launched by PSLV-C6 on May 5, 2005. The main payload was an Indian Remote Sensing satellite, CARTOSAT-1 weighing 1,560 kilograms (3,440 lb). HAMSAT was placed into a polar Sun-synchronous orbit.

It carries two transponders, one built by William Leijenaar (Call Sign: PE1RAH), a Dutch Radio Amateur and graduate engineering student from the Higher Technical Institute at Venlo and the other by Ham enthusiasts with help from the ISRO (Indian Space Research Organisation).^[1] Each transponder is recognized by its beacon. The Indian transponder has an unmodulated carrier on 145.940 MHz. The Dutch transponder is modulated with telemetry information on 145.860 MHz. Both are linear transponders offering the CW, SSB and FM modes of amateur radio communication. They operate Mode-B for U-V operation with UHF uplink and VHF downlink.^[2]

The satellite joins many previous satellites in amateur radio service; mostly launched by AMSAT.

HAMSAT VO-52 failed in space on 11 July 2014, while on its 49,675th orbit, due to the failure of onboard lithium-ion batteries that have met their end of life. Although the satellite's systems and sub-systems are working normally as per the latest telemetry received, the onboard computer recurring to "Reset" mode due to the failure of batteries is hindering operation. Hence, it was decided not to expect any more meaningful and reliable services from HAMSAT VO-52. On 21 July 2014, ISRO decommissioned ‘HAMSAT-VO52′ officially.^[3]^[4]

HAMSAT VO-52 was designed for one-year mission life, but lasted for almost 10 years. The satellite was designed to be maintenance-free, and autonomous. It was a test bed for many new concepts such as a Bus Management Unit (BMU), lithium-ion-based power system, automatic spin rate control and spin axis orientation control (SAOC) for maintaining the satellite attitude without ground commanding. HAMSAT was known as “OSCAR-52” among Amateur HAM operators, and was popular internationally because of its high-sensitivity receiver and strong transmitter.^[3]^[4]

Specifications

The satellite is spin-stabilized. It spins at about 4 RPM.
UHF uplink and VHF downlink
Uplink transponder frequency: 435.250 MHz
Downlink transponder frequency: 145.900 MHz
Beacon frequencies: 145.860 MHz CW telemetry and 145.936 MHz unmodulated carrier
Transponder bandwidth: 60 kHz
Transmitter output power: 1 watt
Antennas: VHF and UHF turnstiles
Communication modes: CW, SSB, FM
Electrical power: Gallium arsenide solar panels charging a lithium-ion battery
Onboard computer: MAR 31750 processor in the spacecraft's electronic bus management unit for attitude control, telemetry, telecommand for ground control, sensor and actuator functions.^[2]

External links

References

^ "HAMSAT". ISRO. Archived from the original on 2010-09-26.
^ ^a ^b "Amateur Radio Satellites Roar Into The 21st Century - 2005: VuSat-OSCAR 52 HamSat". spacetoday.org.
^ ^a ^b "Goodbye HAMSAT-VO52 – Rest In Peace". amsat-uk.org. 21 July 2014.
^ ^a ^b "VO-52 "Hamsat" end of mission". AMSAT. 28 June 2017.

[1] "HAMSAT". ISRO. Archived from the original on 2010-09-26.

[spacetoday-2] "Amateur Radio Satellites Roar Into The 21st Century - 2005: VuSat-OSCAR 52 HamSat". spacetoday.org.

[amsatuk-3] "Goodbye HAMSAT-VO52 – Rest In Peace". amsat-uk.org. 21 July 2014.

[amsat-4] "VO-52 "Hamsat" end of mission". AMSAT. 28 June 2017.

[1]

[2]

[3]

[4]

@@ Line 8: / Line 8: @@
 ! Organization
 | AMSAT-India, William Leijenaar
+http://amsatindia.org/
 |- style="vertical-align:top;"
 ! Mission Type
@@ Line 16: / Line 17: @@
 |- style="vertical-align:top;"
 ! Launch
-| May 5, 2005 on [[Polar Satellite Launch Vehicle|PSLV]]-C6
+| May 5, 2005 on [[PSLV-C6]]
 |- style="vertical-align:top;"
 ! Launch site
@@ Line 22: / Line 23: @@
 |- style="vertical-align:top;"
 ! Mission duration
+| Achieved: 9 Years and 2 Months
-| ?
 |- style="vertical-align:top;"
 ! [[Mass]]
@@ Line 28: / Line 29: @@
 |-
 ! colspan="2" bgcolor="#FFDEAD" align="center" | Orbital elements
-|- style="vertical-align:top;"
+|- style="vertical-align:top;
 ! [[Semi-major axis]]
 | 7004.27&nbsp;km
@@ Line 48: / Line 49: @@
 |}
-'''HAMSAT''' also known as '''HAMSAT INDIA''' and '''VU2SAT''' is a [[Miniaturized satellite|microsatellite]] weighing {{convert|42.5|kg|lb|1}}, providing [[amateur radio satellite]] communications services for Indian and international [[amateur radio operator]]s. This satellite carries the in-orbit designation of VO-52, and is an [[OSCAR]] series satellite.
+'''HAMSAT''' also known as '''HAMSAT INDIA''', '''VU2SAT''' and '''VO-52''' is a [[Miniaturized satellite|microsatellite]] weighing {{convert|42.5|kg|lb|1}}, providing [[amateur radio satellite]] communications services for Indian and international [[amateur radio operator]]s. This satellite carries the in-orbit designation of VO-52, and is an [[OSCAR]] series satellite.
+==History==
-It was launched by [[PSLV]]-C6 on May 5, 2005. The main payload was an [[Indian Remote Sensing satellite]], [[CARTOSAT-1]] weighing {{convert|1560|kg|lb|-1}}. HAMSAT was placed into a polar [[sun synchronous orbit]].
+It was launched by [[PSLV-C6]] on May 5, 2005. The main payload was an [[Indian Remote Sensing satellite]], [[CARTOSAT-1]] weighing {{convert|1560|kg|lb|-1}}. HAMSAT was placed into a polar [[Sun-synchronous orbit]].
-It carries two [[transponder]]s, one built by William Leijenaar (Call Sign: PE1RAH), a Dutch Radio Amateur and graduate engineering student from the [[Higher Technical Institute]] at [[Venlo]] and the other by enthusiasts at [[ISRO]] (Indian Space Research Organisation).
+It carries two [[transponder]]s, one built by William Leijenaar (Call Sign: PE1RAH), a Dutch Radio Amateur and graduate engineering student from the [[Higher Technical Institute]] at [[Venlo]] and the other by Ham enthusiasts with help from the [[ISRO]] (Indian Space Research Organisation).<ref>{{cite web |url=http://www.isro.org/satellites/hamsat.aspx |title=HAMSAT |work=[[ISRO]] |url-status=dead |archive-url=https://web.archive.org/web/20100926103619/http://isro.org/satellites/hamsat.aspx |archive-date=2010-09-26 }}</ref> Each transponder is recognized by its beacon. The Indian transponder has an unmodulated carrier on 145.940&nbsp;MHz. The Dutch transponder is modulated with telemetry information on 145.860&nbsp;MHz. Both are linear transponders offering the CW, SSB and FM modes of amateur radio communication. They operate Mode-B for U-V operation with UHF uplink and VHF downlink.<ref name="spacetoday">{{cite web |url=http://www.spacetoday.org/Satellites/Hamsats/Hamsats2000s.html |title=Amateur Radio Satellites Roar Into The 21st Century - 2005: VuSat-OSCAR 52 HamSat |work = spacetoday.org }}</ref>
 The satellite joins many previous satellites in amateur radio service; mostly launched by [[AMSAT]].
+HAMSAT VO-52 failed in space on 11 July 2014, while on its 49,675th orbit, due to the failure of onboard lithium-ion batteries that have met their end of life. Although the satellite's systems and sub-systems are working normally as per the latest telemetry received, the onboard computer recurring to "Reset" mode due to the failure of batteries is hindering operation.  Hence, it was decided not to expect any more meaningful and reliable services from HAMSAT VO-52. On 21 July 2014, ISRO decommissioned ‘HAMSAT-VO52′ officially.<ref name="amsatuk">{{cite web |url=http://amsat-uk.org/2014/07/21/goodbye-hamsat-vo52-rest-in-peace/ |title=Goodbye HAMSAT-VO52 – Rest In Peace |work=amsat-uk.org|date=21 July 2014 }}</ref><ref name="amsat">{{cite web |url=http://www.amsat.org/?p=2988 |title=VO-52 "Hamsat" end of mission |work=[[AMSAT]] |date=28 June 2017 }}</ref>
+HAMSAT VO-52 was designed for one-year mission life, but lasted for almost 10 years. The satellite was designed to be maintenance-free, and autonomous. It was a test bed for many new concepts such as a Bus Management Unit (BMU), lithium-ion-based power system, automatic spin rate control and spin axis orientation control (SAOC) for maintaining the satellite attitude without ground commanding. HAMSAT was known as “OSCAR-52” among Amateur HAM operators, and was popular internationally because of its high-sensitivity receiver and strong transmitter.<ref name="amsatuk"/><ref name="amsat"/>
+==Specifications==
+*The satellite is spin-stabilized. It spins at about 4&nbsp;RPM.
+*UHF uplink and VHF downlink
+*Uplink transponder frequency: 435.250&nbsp;MHz
+*Downlink transponder frequency: 145.900&nbsp;MHz
+*Beacon frequencies: 145.860&nbsp;MHz CW telemetry and 145.936&nbsp;MHz unmodulated carrier
+*Transponder bandwidth: 60&nbsp;kHz
+*Transmitter output power: 1 watt
+*Antennas: VHF and UHF turnstiles
+*Communication modes: CW, SSB, FM
+*Electrical power: Gallium arsenide solar panels charging a lithium-ion battery
+*Onboard computer: MAR 31750 processor in the spacecraft's electronic bus management unit for attitude control, telemetry, telecommand for ground control, sensor and actuator functions.<ref name="spacetoday"/>
 ==See also==
+{{Portal|Spaceflight}}
 *[[Indian space program]]
 *[[List of Indian satellites]]
@@ Line 62: / Line 83: @@
 ==External links==
-*[http://www.isro.org/satellites/hamsat.aspx ISRO: HAMSAT]
+*[https://web.archive.org/web/20100926103619/http://isro.org/satellites/hamsat.aspx ISRO: HAMSAT]
-*[http://www.amsat.org/amsat-new/satellites/sat_summary/hamsat.php AMSAT link]
+*[https://web.archive.org/web/20080731141914/http://www.amsat.org/amsat-new/satellites/sat_summary/hamsat.php AMSAT link]
-*[http://photos.groups.yahoo.com/group/eu-amsat/lst?.dir=/PE1RAH&.src=gr&.order=&.view=t&.done=http%3a//briefcase.yahoo.com/ Yahoo Groups (Photos and discussion)]
+==References==
-{{Indian space program}}
+{{Reflist}}
+{{Indian space programme}}
+{{Indian spacecraft}}
 {{Orbital launches in 2005}}
 {{DEFAULTSORT:Hamsat}}
-[[Category:Space programme of India]]
+[[Category:Communications satellites of India]]
 [[Category:Amateur radio satellites]]
 [[Category:Amateur radio in India]]
-[[Category:Artificial satellites orbiting Earth]]
+[[Category:Satellites orbiting Earth]]
-[[Category:2005 in spaceflight]]
+[[Category:Spacecraft launched in 2005]]
-[[Category:Satellites]]
+[[Category:2005 in India]]
-[[Category:Satellites of India]]
-{{Amateur-radio-stub}}
-{{India-spacecraft-stub}}

v t e ← 2004 Orbital launches in 2005 2006 →
January	Deep Impact Kosmos 2414, Universitetsky-Tatyana
February	AMC-12 USA-181 XTAR-EUR, Maqsat-B2 (Sloshsat-FLEVO) Himawari 6 Progress M-52 (TNS-0)
March	XM-3 Inmarsat-4 F1 Ekspress AM-2
April	USA-165 Apstar 6 Soyuz TMA-6 DART Spaceway 1 USA-182
May	Cartosat-1, HAMSAT NOAA-18 DirecTV-8 Foton-M No.2
June	Progress-M 53 Molniya-3K No.12 Cosmos 1 Intelsat Americas 8 Ekspress AM-3
July	Shijian 7 Suzaku STS-114 (Raffaello MPLM)
August	FSW-4 2 Thaicom 4 MRO Kirari, Reimei Monitor-E FSW-3 3
September	Kosmos 2415 Progress-M 54 (RadioSkaf) Anik F1R USA-183 USA-185
October	Soyuz TMA-7 CryoSat Shenzhou 6 Syracuse 3A, Galaxy 15 USA-186 Beijing-1, TopSat, Sina-1, SSETI Express (CubeSat Xi-V, UWE-1, nCUBE-2), Mozhaets-5, Rubin-5
November	Inmarsat-4 F2 Venus Express Spaceway-2, Telkom-2
December	Progress-M 55 Gonets-M No.1, Kosmos 2416 Meteosat 9, INSAT-4A Kosmos 2417, Kosmos 2418, Kosmos 2419 GIOVE-A AMC-23
Launches are separated by dots ( • ), payloads by commas ( , ), multiple names for the same satellite by slashes ( / ). Crewed flights are underlined. Launch failures are marked with the † sign. Payloads deployed from other spacecraft are (enclosed in parentheses).