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WG3K > ANS 24.11.24 02:25l 58 Lines 2977 Bytes #152 (0) @ AMSAT
BID : ANS329.4
Read: GUEST
Subj: New Chinese Satellite Completes Frequency Coordination
Path: IZ3LSV<DB0ERF<DK0WUE<PI8ZTM<N9SEO<K5DAT<W0ARP<WW4BSA<N3HYM<WG3K
Sent: 241124/0114Z 10296@WG3K.#SMD.MD.USA.NOAM LinBPQ6.0.24
The satellite frequency coordination committee of the International Amateur
Radio Union (IARU) on November 15 completed approval of frequency requests
from the Chinese Amateur Satellite Group (CAMSAT) for a new amateur
satellite to be launched next year.
CAS-11, a 6U CubeSat will include:
- HF/UHF – H/U Mode Linear Transponder, with a bandwidth of 15kHz
downlink centered at 435.505 MHz, EIRP 24 dBm
Uplink 21.320 MHz +/- 7.5 kHz.
- VHF/UHF – V/U Mode Linear Transponder, with a bandwidth of 30kHz
downlink centered at 435.540 MHz, EIRP 24 dBm.
Uplink 145.860 MHz +/- 15 kHz.
- VHF/UHF – V/U Mode FM Transponder, downlink at 435.600 MHz, EIRP 24 dBm
Uplink at 145.925 MHz
- VHF/UHF – V/U Mode digital store-and-forward Transponder, downlink at
435.700 MHz, EIRP 24 dBm
Uplink at 145.895 MHz
- UHF – CW Telemetry Beacon and
- UHF telemetry beacon using AX.25 4.8k/9.6kbps GMSK at 435.570 MHz,
EIRP 23 dBm.
The above transponders and beacon will work 24/7 when the satellite power
supply is sufficient. Amateur radio enthusiasts around the world can use it
for two-way radio relay communication, data storage and forwarding
communication, and receive satellite CW beacons.
The CAS-11 satellite will also be equipped with a 2.4 GHz multi-mode
amateur radio satellite beacon transmitter, which is designed and built by
university students, high school students and primary school students from
Beijing Donggaodi Science and Technology Museum and Beijing University of
Posts and Telecommunications under the guidance of CAMSAT. This is an
unprecedented satellite project in China. It has brought opportunities for
learning and practicing amateur radio and amateur satellites to students of
all grades from elementary school to university, and promoted the
application of amateur radio in space. This 2.4 GHz experimental beacon
transmitter can switch to transmit five different modes of radio signals,
and it will work continuously when the satellite is fully powered.
This project aims to cultivate studentsâ€Ö knowledge, skills and interests in
amateur radio satellites. All transmission modes operate at 2.4 GHz, and
the working modes are converted by the on-board computer program and ground
remote control commands. It can work in the following modes: CW Telemetry
Beacon, FT8 Telemetry Beacon, PPM Telemetry Beacon, or USB/SSTV Robot36,
PD120 1. This beacon will transmit at 2405.500 MHz, EIRP 27 dBm.
CAS-11 carries three cameras, and the photos it takes are stored in the
flash memory on the satellite. The builders have designed a simple remote
control system based on DTMF commands. Amateur radio enthusiasts around the
world can send DTMF commands to download the photo catalog and all photos
taken by all cameras.
Anticipating a launch in September, 2025 into a 536 km polar orbit from
Haiyang Sea Launch Platform, Shandong, China.
[ANS thanks IARU and Alan Kung, BA1DU, of CAMSAT for the above information.]
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