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BSE, BS 2a, 2b (Yuri 1, 2a, 2b)

BS 2a (Yuri 2a) [NASDA]

The BSE (Broadcasting Satellite Experimental) and BS-2 (Broadcasting Satellite 2) series were the first generation of Japanese direct broadcasting satellites initially developed for the Japanese Ministry of Posts and Telecommunications and for the Japan Broadcasting Corporation (NHK).

The satellites were built by Toshiba with assistance by RCA Astro. They were actively three-axis stabilized employing zero-momentum wheels and hydrazine thrusters. The spacecraft carried two active and one spare 100 Watt 14/12 GHz transponders.

The protoype BSE was launched on 7 April 1978 on an american Delta-2914 rocket. In orbit it was renamed Yuri 1. The satellite was designed for a three year lifetime on an orbital position at 110 East. Experiments utilized 2.1, 2.3, 12, and 14 GHz frequencies for satellite control/telemetry, and TV transmission studies. The experiments involved studies of TV signal characteristics, rainfall attenuation at 12 GHz, satellite/ground terminal performance, ground/satellite frequency sharing, satellite control techniques, satellite broadcasting operations, and TV signal quality assessment.

The first operational satellite, BS 2a, followed on 23 Janauary 1964 on a Japanese N-2 Star-37E rocket. It was renamed Yuri 2a after reaching orbit. The purpose of the BS-2 satellites were to eliminate poor television reception areas and to develop the technology concerning broadcasting satellites.

The second operational satellite, BS 2b, was on 12 February 1986 also orbitedon a Japanese N-2 Star-37E rocket. It was renamed Yuri 2b after reaching orbit.

Nation: Japan
Type / Application: Communication
Operator: Japanese Ministry of Posts and Telecommunications, Japan Broadcasting Corporation (NHK)
Contractors: RCA Astro
Equipment: 2 (+1) Ku-band transponders 100W TWTA, 27 MHz bandwidth EIRP max 54 dBW
Configuration: AS-3000 ?
Propulsion: Star-27
Power: 2 deployable solar arrays, batteries
Lifetime: 3 years (#1)
Orbit: GEO
Satellite COSPAR Date LS Launch Vehicle Remarks
BSE (Yuri 1) 1978-039A 07.04.1978 CC LC-17B Delta-2914
BS 2a (Yuri 2a) 1984-005A 23.01.1984 Ta LP-N N-2 Star-37E
BS 2b (Yuri 2b) 1986-016A 12.02.1986 Ta LP-N N-2 Star-37E
Further BS missions: