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21087.SAT
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1992-05-03
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F6BVP 01/05/92
Satellite Amateur OSCAR-21 embarque a bord du satellite Russe INFORMTR-1
Numero de catalogue NASA: 21087
Lance le 29 Janvier 1991.
Mission
-------
Piggy-back onboard the USSR geological research
satellite.
Launch and Orbit
----------------
Orbit (planned)
slightly elliptical polar orbit
appogee: 1000 km
Inclination: 83 degrees
Period: 105 minutes
Satellite specifications
------------------------
1. Dimension and shape
Cylinder of hight about 4 meters
diameter 1.8 meters
2. System configuration
Professional geological research equipment, telemetry
system, command link equipment, transponders and power
supply, thermal control.
Amateur linear and digital transponders, telemetry
system, command link equipment, power supply.
3. Attitude control
Satellite attitude will be maintained by the earth's
gravity field by a rod 9 meters length pointing away
from the earth.
4. Planned service life: 3 years
Radio-M1/Rudak-2 System specifications
--------------------------------------
1. System configuration
Two sets of the equipment will be installed aboard the satellite:
Linear transponder #1 mode B and RUDAK-2 with subsystems
Linear transponder #2 mode B with subsystems
The first set is concidered to be the main. The second one is
reserve. It can be taken into operation in the case of
failure of the first one.
2. Commands
Equiped with real-time program command function
3. Beacons and telemetry #1 set
CW telemetry 8 channels 145.822 MHz 0.2 Watts
Digital telemetry 30 channels 145.952 MHz 0.4 Watts
1100 bps,BPSK/FM, deviation 2kHz
Digital telemetry Rudak-2 145.983 MHz 3.0 Watts
BPSK 1200 bps AX.25 (like FO-20)
4. Beacons and telemetry #2 set
CW telemetry 8 channels 145.948 MHz 0.2 Watts
Digital telemetry 30 channels 145.838 MHz 0.4 Watts
1100 bps,BPSK/FM, deviation 2kHz
Digital telemetry 30 channels 145.800 MHz 2.0 Watts
1100 bps BPSK/FM, deviation 2kHz
5. Transponders #1 set
(1) Linear transponder: inversely heterodined translator
Uplink passband 435.102 to 435.022 MHz
Downlink passband 145.852 to 145.932 MHz
Transmitter output max 10 Watts
Bandwith (3db) 80 kHz
Uplink EIRP required about 100 Watts
(2) Digital transponder Rudak-2: digipeater and store&forward
packet communication (AX.25), telecommunications experiment
with digital signal processing up to nearly 20 kHz,
1 MByte RAM discphase-M
RX-2 435.155 MHz (AFC) 2400 bps,BPSK, Biphase-S
RX-3a 435.193 MHz (AFC) 4800 bps,RSM
RX-3b 435.193 MHz (AFC) 9600 bps,RSM
RX-4 435.041 MHz (digital AFC) RX for RTX-DSP
Downlink frequency: 145.983 MHz 3 Watts
The downlink can be switched to the following operating modes:
Mode 1: 1200 bps, BPSK, NRZI,(NRZ-S) (like FO-20)
Mode 2: 400 bps, BPSK, Biphase-S (Oscar-13 beacon)
Mode 3: 2400 bps, BPSK, Biphase-S
Mode 4: 4800 bps, RSM, NRZIC (Biphase-M) (like 4800 bps uplink)
Mode 5: 9600 bps, RSM, NRZI (NRZ-S) +Scrambler (like 9600 bps uplink)
Mode 6: CW keying (only for special events)
Mode 7: FSK (F1 or F2B),e.g. RTTY, SSTV, FAX, etc.(for special events)
Mode 8: FM modulated by D/A signals from DSP-RISC processor (speech)
6. Transponder #2 set
Linear transponder: inversely geterodined translator
Uplink passband 435.123 to 435.043 MHz
Downlink frequencys 145.866 to 145.946 MHz
Transmitter output max 10 Watt max.
Bandwith (3db) 80 kHz
Uplink EIRP required about 100 Watts
7. Antennas
(1) 435 MHz receiving antenna (shared by analog and digital modes):
Helix +3 db max RHCP.
(2) 145 MHz transmitting antenna:
Half wave dipol
8. Power supply
From main power supply system up to 100 Watts
Set #1 consumption 47 Watts
Set #2 consumption 40 Watts
9. Weight
Set #1 approx. 28 kg
Set #2 approx. 22 kg
10. Size: 480x400x300 mm^3 each set.
73s de UA3CR @RK3KP
DB2OS @DK0MAV or @UOSAT3
from SpaceNews by KD2BD in Wall Township, New Jersey, USA.
Name : AMSAT-OSCAR-21, NASA Catalog Number: 21087, Launched on 29-Jan-91
Orbit : Low-altitude, circular
AO-21/RS14 is a multi-function satellite supporting Mode B analog transponders
as well as a multitude of digital store-and-forward modes. Unfortunately,
post launch electronics problems have confined operations to limited Mode
B transponder #2 communications.
Transponder #2:
Uplink Passband: 435.123 to 435.043 MHz (100 watts EIRP)
Downlink Passband: 145.866 to 145.946 MHz (10 watts Maximum)
CW Beacon : 145.948 MHz (0.2 watts)
Digital Beacon : 145.838 MHz (0.4 watts, FM)
Digital Beacon : 145.800 MHz (2.0 watts, FM)
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