DOSAAF-85
| DOSAAF-85 RS-44 RADIO-2017 |
|
|---|---|
| Type: | Research satellite amateur radio satellite |
| Country: |
 Russia
|
| COSPAR-ID : | 2019-096E |
| Mission dates | |
| Begin: | December 26, 2019 23:11 UTC |
| Starting place: | Plesetsk Cosmodrome 133/3 |
| Launcher: | Rockot KM |
| Orbit data | |
| Rotation time : | 112.5 min |
| Orbit inclination : | 82.5 ° |
| Apogee height : | 1,517.6 km |
| Perigee height : | 1,182.0 km |
DOSAAF-85 , ДОСААФ-85, Radio Sputnik 44, RS-44, RADIO-2017 is a Russian microsatellite that serves as a research satellite and also carries a payload for amateur radio communications. The name of the satellite commemorates the 85th anniversary of the Voluntary Society in Support of the Army, Aviation and Navy ( DOSAAF ). Another source refers to the satellite as RADIO-2017. In the international amateur radio community, however, the designations DOSAAF-85 and RS-44 are used.
construction
DOSAAF-85 was developed by specialists from Information Satellite Systems (ISS) Reshetnev and students from Reshetnyov University (SibSAU) in Krasnoyarsk . The microsatellite was designed as a scientific satellite and as an amateur radio satellite. It is the third satellite created on the basis of the Jubileiny satellite platform. The 30-kilogram Jubileiny satellite bus has a hexagonal shape and consists of three levels - a lower, middle and upper one for the various devices. The outer sides have gallium arsenide triple solar cells for electricity generation (20 watts). The energy is stored in a nickel-metal hydride battery and distributed via a 12-volt line bus. The heat is regulated by multilayer insulation, electrical heating and heat pipes . The satellite has gravitational stabilization . DOSAAF-85 uses a VHF uplink system (145 MHz) for control and a UHF telemetry downlink system that achieves data rates of 2.5 kbit / s. An S-band communication system (2400-2485 MHz) is used for the downlink of user data with up to 1 Mbit / s. Furthermore, the satellite has a linear transponder for the amateur radio service via satellites . The exact nature of the further satellite payload was not disclosed.
mission
The satellite was launched on December 26, 2019 on a Rokot-KM launcher from the Plesetsk cosmodrome together with three Gonets-M satellites and BLITS-M 1. The satellite did not separate from the Briz KM upper rocket stage . The antennas are located at the rear of the satellite and look away from the rocket stage. Therefore the satellite is fully functional. The transponder was put into operation on April 30, 2020.
DX records have already been set via the transponder. Hector Martinez, W5CBF, in Lake Charles (Louisiana) and Antonio Gutierrez, DL4EA, in Boeblingen (Germany) achieved a record connection of 8,357 km on May 26th. The previous record of 8,314 km from the KI7UNJ and EB1AO only lasted nine days. The theoretical range for connections via DOSAAF-85 is 7,942 km due to the orbit.
Frequencies
The frequencies used by the satellite with the callsign RS44 were not coordinated by the International Amateur Radio Union .
- 145.935–145.995 MHz - uplink LSB inverting
- 435.610–435.670 MHz - Downlink USB (power 5 W)
- 435.6044 MHz - CW beacon
literature
Frey, Thomas: "Radio-Sputnik-44 activated", Funkamateur 2020 issue 7, page 625
Individual evidence
- ↑ Ciprian Sufitchi: BREEZE-KM R / B. May 1, 2020, accessed on May 3, 2020 .
- ↑ Anatoly Zak: Last Rockot launches a satellite cluster. December 28, 2019, accessed May 3, 2020 .
- ^ DOSAAF-85. September 24, 2015, accessed July 8, 2020 .
- ^ Paul Stoetzer: RS-44 Transponder Now Active. May 3, 2020, accessed on May 3, 2020 .
- ^ Paul Stoetzer: New Satellite Distance Records Claimed. June 14, 2020, accessed on July 8, 2020 .