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Satellite Detail - Fuji-OSCAR 29

Launch Pad

Navigator

Fuji-OSCAR 29
(JAS 2)

Spacecraft Summary

OSCAR Designation:	Fuji-OSCAR 29	Oscar Number:	FO-29
International Designator:	1996-046B	Norad Number:	24278
Common Name:	JAS 2	Satellite Type:	Satellite
Launch Date:	17 August, 1996	Launch Location:	Tanegashima Space Center
Launch Vehicle:	H-II No. 4	Apogee:	1323.00
Perigee:	800.00	Inclination:	98.54
Period:	106.44	Dimensions:	44 x 47 polyhedron
Weight:	50.000 Kg
Organization:	Japan Amateur Radio League

Frequency Information


Mode V/U (J) Linear Transponder (Inverting): Non-Operational
Uplink:	145.9000 - 146.0000 MHz SSB/CW
Downlink	435.8000 - 435.9000 MHz SSB/CW

Mode V/U (J) PacSat BBS: Non-Operational
Uplink:	145.8000 MHz BPSK 1200 BPS
Uplink:	145.8700 MHz BPSK 1200 BPS
Uplink:	145.9100 MHz BPSK 1200 BPS
Downlink	435.9100 MHz FSK 9600 BPS

Mode U Beacon: Operational
Downlink	435.7950 MHz CW

Mode U Digitalker (Rarely Used): Semi-Operational
Downlink	435.9100 MHz FM

Callsign(s)

BBS:

8J1JCS

Current Keplerian Elements

FO-29
1 24278U 96046B   09325.59430936 -.00000052  00000-0 -14559-4 0  1805
2 24278  98.5217 178.2790 0350063 302.4460  54.3266 13.52946464655036

Weekly Satellite Report

(As of 8/30/2009, FO-29's transponders are off, and the beacon is operational when being commanded over Japan.)

JARL report about FO-29 (Fuji-3) power status
Translated by Mineo Wakita, JE9PEL
7 Aug 2007

The internal impedance of the battery in FO-29 (Fuji-3) is now rising
extremely due to the deterioration caused by almost 12 years in orbit..

According to the telemetry data a 25 minute eclipse duration is estimated
as a limit as for the analog battery system use. Because the eclipse
length of FO-29 (Fuji-3) is currently about 30% or almost 32 minutes,
the power supply of the relay with the battery cannot serve a period of
the eclipse.

A malfunction also occurs in part of the electricity control system.
The malfunction is the UVC which is an automatic function for electricity
management. When the satellite is in the eclipse, and the light of the sun
is not the solar battery, the transmitter is turned OFF by the UVC.

It is designed so that later an analog system transmitter becomes ON
automatically when the terminal voltages of the battery exceed a set value
after the power is available from the solar battery. However, it appears
likely that a malfunction occurs for this function, and the terminal
voltage cannot turn on a transmitter even if it exceeds the set value
unless commanded from the ground.

The length of eclipses for FO-29 (Fuji-3) will rise in future and rises
to 34% in March 2008 and comes over a peak of the eclipse duration.
When it goes over this peak, the eclipses will decrease slowly, and drop
to 20% in August 2009. By February 2010 it is all sunshine with no eclipses
for about 8 months. It seems that we can apply the analog system relay
consecutively for this period.

-----

Please send reception reports to lab2 'at' jarl.or.jp.
Please use the subject line: 'FO-29 reception report'.

Mineo, JE9PEL, has an FO-29 satellite telemetry analysis program that will automatically analyze all digital telemetry from the satellite (such as current, voltage and temperature). FO29CWTE is available at:
http://www.ne.jp/asahi/hamradio/je9pel/

Detailed Description

FO-29 carrys a 100KHz wide SSB/CW linear transponder that operates in mode V/U. It additionally carries a 1k2/9k6 digital BBS that is no longer operational and a Digitalker beacon that transmits a digital voice on FM.

FO-29 includes an attitude control system that consists consists of a sun-sensor, geomagnetism sensor, magnetorquer and data processor. It also features an advanced solar cell experiment consisting of gallium-arsenide solar cells 2cm x 2cm and 2cm x 1cm cells.

Orbit

Polar orbit, details have not been fixed yet.
Perigee between 800 and 900 km above the ground and we are asking NASDA to take apogee as high as possible.

Launch

Launched by H-II rocket No.4, from Tanegashima Space Center of NASDA.

Mission subsystem (communication subsystem)

JAS-2 operates in mode J, that is, 145MHz band for uplink and 435MHz band for downlink.

Analog transponder (linear transponder) for phone and CW. Total transmitting power is 1W, of which beacon is 100 mW.
Digital transponder (store-and-forward packet processor) bit rate 1200 or 9600 bps, alternative operation for 1200 bps, uplink in Manchester coded FM / downlink in bi-phase PSK for 9600 bps, FSK after G3RUH, both uplink and downlink. Total transmitting power is 1 W.
Digi-talker transmits information by voice, audible with a hand-held transceiver. Source information data in PCM is sent to JAS-2 from the control station.
Data processor, consisting of the CPU V50, static RAMs of 2MB, deals with BBS, digi-talker, telemetry and command data processing and self-operating jobs.

Bus subsystem

Size and structure
44 cm wide and 47cm high, sphere-like polyhedron consisting of 26 panels,weighs 50 kg.
Power supply
Gallium-Arsenide solar cells of 2cm x 2cm and 2cm x 1cm pieces, and 11 cells of Nickel-Cadmium storage battery of 6 AH.
Attitude control
This consists of sun-sensor, geomagnetism sensor, electric magnet or magnetorquer and data processor.
The axis of symmetry of JAS-2 becomes the spin axis, and operating attitude will be in so-called "wheel mode", that is the spin axis being perpendicular to the orbit plane.

Reference Documents:

Mineo Wakita's, JE9PEL, FO-29 status 7 Aug 2007 http://www.ne.jp/asahi/hamradio/je9pel/fo29sta3.htm
Steve Ford, WB8IMY, "JAS-2 In Orbit!,"QST, Oct. 1996, p. 94.
Fujio Yamashita, JS1UKR and Hideo Ono, JA1BU, "JAS-2 Comes to Life as FO-29,"The AMSAT Journal, Vol. 19, No. 5, Sep/Aug 1996, p. 1.

Fuji-OSCAR 29(JAS 2)