Informator

Also called AO-21 or RS-14 or Rudak 2 or Oscar 21

---

General

Designation	21087 / 91006A
Launch date	29 Jan 1991
Country of origin	CIS
Mission	Telecommunications
Perigee/Apogee	955/1005 km
Inclination	82.9°
Period	104.7 min
Launch vehicle	Cosmos C
Launch site	Plesetsk

---

End of life

Out of service

mid-October 1994

Technical data

---

Analog transponders and a digital signal processing (DSP) experiment. The DSP experiment being a bit of a chameleon, can serve many different functions, one of them being an FM repeater, another being a mailbox experiment like the Pacsat's.

---

Transponder 1:

Mode B up	435.102 - 435.022 MHz
Mode B down	145.852 - 145.932 MHz
Beacons	145.822 MHz CW, 145.952 MHz 1100 bps PSK

---

Transponder 2:

Mode B up	435.123 - 435.043 MHz
Mode B down	145.866 - 145.946 MHz
Beacons	145.948 MHz CW, 145.838 MHz 1100 bps PSK

---

RUDAK Transponder:

Uplink 1	435.016 MHz 1200 bps Manchester FSK + FM repeater input frq.
Uplink 2	435.155 MHz 2400 bps BPSK
Uplink 3A	435.193 MHz 4800 bps RSM NRZI
Uplink 3B	435.193 MHz 9600 bps RSM NRZI
Uplink 4	435.041 MHz Digital Signal Processor input

Downlink	145.987 MHz
Mode 1	Pacsat / FO-20 compatible
Mode 2	AO-13 400 bps BPSK compatible
Mode 3	AO-13 RUDAK I compatible
Mode 4	4800 bps
Mode 5	9600 bps
Mode 6	CW
Mode 7	FSK (F1 or F2B) RTTY, FAX, SSTV, etc.
Mode 8	FM using D/A converter and DSP output

---