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CAS-9 XW-3 launch Dec 26 2021

CAS-9 XW-3

Updated info 22 dec from Alan Kung, BA1DU:

Hello OM,
The CAMSAT XW-3 (CAS-9) amateur radio satellite will be launched at UTC 03:11:31 on 2021-12-26 , and will be deployed at 98.858° east longitude and 28.413° north latitude at UTC 03:35:58, location close to Western Australia.

Radio amateurs will receive CW beacon and GMSK telemetry signals approximately 38 seconds after the satellite is separated from the launch vehicle, and then the linear transponder will be put into use after approximately 49 seconds.

Attached is the launch schedule and the Two-Line Orbital Element file.



73!
Alan Kung, BA1DU

XW-3(CAS-9)
1 99999U 21360.14997609 .00000032 00000-0 10363-4 0 00007
2 99999 098.5836 072.3686 0004232 307.2415 261.3002 14.38559758000156

This is an example how a pass can look like over north NA and EU:


According to info from ANS-353 and BA1DU, Alan Kung, CAMSAT XW-3(CAS-9) amateur radio satellite will be launched by Chinese CZ-4C Y39 launch vehicle on December 25, 2021 from the Taiyuan Satellite Launch Center in China. XW-3(CAS-9) satellite will be piggybacked on the rocket with primary payload ZY-1(02E) satellite.

The satellite orbit is a circular sun-synchronous orbit with an altitude of 770.1 kilometers and an inclination of 98.58 degrees, the running cycle is 100.14 minutes. The functions of XW-3(CAS-9) satellite include UHF CW telemetry beacon, GMSK telemetry data transmission, V/U mode linear transponder, a visible light band space camera and an experimental thermoelectric generator for high school students. After the satellite completes the in-orbit test and works normally, the space camera photo download will be open to amateur radio enthusiasts all over the world.

When the relevant remote control command is received by the satellite, the GMSK telemetry channel will be used to downlink the photo storage information and photo data, and the telemetry data will stop sending at that time.

XW-3(CAS-9) satellite adopts a 6U CubeSat structure with a mass of about 10kg, an onorbit envelope size of 340.5×121.76x998mm with four solar array panels and a threeaxis stabilized attitude control system is used, long-term power consumption is about 15.2 Watts.

Technical specifications:
● VHF antenna: 1/4 wavelength whip antenna
● UHF antenna: 1/4 wavelength whip antenna
● CW telemetry beacon:
Frequency: 435.575MHz RF power: 20dBm CW rate: 22wpm
● GMSK telemetry:
Frequency: 435.725MHz RF power: 23dBm Data rate: 4800bps
● V/U mode linear transponder:
Uplink frequency: 145.870MHz
Downlink frequency: 435.180MHz
RF power: 20dBm Bandwidth: 30kHz Spectrum inverted

By SM0TGU

Webmaster and member of the AMSAT-SM steering group.

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