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.
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 on-board lithium ion batteries that have met their end of life. Although the satellite's systems and sub-systems are working normal as per the latest telemetry received, the on-board 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 has 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]
Specificationsedit
The satellite is spin stabilized. It spins at about 4 RPM.
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]
^. ISRO. Archived from the original on 2010-09-26.
^ ab"Amateur Radio Satellites Roar Into The 21st Century - 2005: VuSat-OSCAR 52 HamSat". spacetoday.org.
^ ab"Goodbye HAMSAT-VO52 – Rest In Peace". amsat-uk.org. 21 July 2014.
^ ab"VO-52 "Hamsat" end of mission". AMSAT. 28 June 2017.
January 01, 1970
hamsat, also, known, india, vu2sat, microsatellite, weighing, kilograms, providing, amateur, radio, satellite, communications, services, indian, international, amateur, radio, operators, this, satellite, carries, orbit, designation, oscar, series, satellite, o. 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 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 Contents 1 History 2 Specifications 3 See also 4 External links 5 ReferencesHistory editIt 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 on board lithium ion batteries that have met their end of life Although the satellite s systems and sub systems are working normal as per the latest telemetry received the on board 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 has 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 editThe 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 See also edit nbsp Spaceflight portal Indian space program List of Indian satellites Amateur radio in IndiaExternal links editISRO HAMSAT AMSAT linkReferences edit 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 Retrieved from https en wikipedia org w index php title HAMSAT amp oldid 1176554078, wikipedia, wiki, book, books, library,
