Radar Fence Transponder


Radar Fence Transponder (also called Navy-OSCAR 60 or RAFT 1) was an amateur radio satellite that was developed and built for training purposes at the United States Naval Academy.[2] The 3 kg (6.6 lb) heavy RAFT had a cubic structure of 12.7 cm (5.0 in) edge length and therefore did not meet the Cubesat standard. Solar cells on all six sides of the satellite were used to supply energy. It had neither position control nor drive systems.

Radar Fence Transponder
Mission typeCommunications
OperatorU.S. Naval Academy
COSPAR ID2006-055C Edit this at Wikidata
SATCAT no.29661
Spacecraft properties
Launch mass3 kg (6.6 lb)
Start of mission
Launch date21 December 2006, 01:47 UTC
RocketSpace Shuttle Discovery
Launch siteKennedy LC-39B[1]
End of mission
Decay date30 May 2007
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Perigee altitude228 km (142 mi)
Apogee altitude254 km (158 mi)
Period89.3 minutes
← OSCAR 59
OSCAR 61 →

RAFT contained a receiver at 216.98 MHz for calibration experiments of the U.S. Navy Space Surveillance Radar. For amateur radio connections there was an AX.25 digipeater on 145.825 MHz with built-in speech synthesizer on board.

Two fixed antennas equipped with springs were used for communication and also as a separation system for the almost identical sister satellite MARScom. Furthermore, a 122 cm (48 in) long wire antenna made of 0.5 mm (0.020 in) nitinol wire for the 10 m amateur radio band was unwound on shortwave during the disconnection process, with which the satellite received signals in the PSK31 operating mode.[3]

Mission Edit

The satellite was released on 21 December 2006 with Space Shuttle Discovery (STS-116) from Kennedy Space Center, Florida.

On 30 May 2007, it was re-entered on Earth atmosphere.

See also Edit

References Edit

  1. ^ Gunter Dirk Krebs. "RAFT1 (NO 60, Navy-OSCAR 60) / MARScom (NMARS)". Gunter's Space Page. Retrieved 20 February 2020.
  2. ^ United Nations Secretariat (17 September 2007). "Committee on the Peaceful Uses of Outer Space". Archived from the original on 20 October 2013. Retrieved 20 February 2020.
  3. ^ U.S. Naval Academy Amateur Radio Club (22 November 2004). "Operations of RAFT in the amateur satellite service". Retrieved 20 February 2020.

External links Edit