SM7WSJ
Well-Known Member
Det kommer en ny kinesisk satellit (som är frekvens koordinerad). Blir intressant med deras 2,4 GHz experiment.
New Chinese Satellite Completes Frequency Coordination
The satellite frequency coordination committee of the International AmateurRadio Union (IARU) on November 15 completed approval of frequency requestsfrom the Chinese Amateur Satellite Group (CAMSAT) for a new amateursatellite 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 powersupply is sufficient. Amateur radio enthusiasts around the world can use itfor two-way radio relay communication, data storage and forwardingcommunication, and receive satellite CW beacons.
The CAS-11 satellite will also be equipped with a 2.4 GHz multi-modeamateur radio satellite beacon transmitter, which is designed and built byuniversity students, high school students and primary school students fromBeijing Donggaodi Science and Technology Museum and Beijing University ofPosts and Telecommunications under the guidance of CAMSAT. This is anunprecedented satellite project in China. It has brought opportunities forlearning and practicing amateur radio and amateur satellites to students ofall grades from elementary school to university, and promoted theapplication of amateur radio in space. This 2.4 GHz experimental beacontransmitter 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 students’ knowledge, skills and interests inamateur radio satellites. All transmission modes operate at 2.4 GHz, andthe working modes are converted by the on-board computer program and groundremote control commands. It can work in the following modes: CW TelemetryBeacon, 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 theflash memory on the satellite. The builders have designed a simple remotecontrol system based on DTMF commands. Amateur radio enthusiasts around theworld can send DTMF commands to download the photo catalog and all photostaken by all cameras.
Anticipating a launch in September, 2025 into a 536 km polar orbit fromHaiyang Sea Launch Platform, Shandong, China.
New Chinese Satellite Completes Frequency Coordination
The satellite frequency coordination committee of the International AmateurRadio Union (IARU) on November 15 completed approval of frequency requestsfrom the Chinese Amateur Satellite Group (CAMSAT) for a new amateursatellite 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 powersupply is sufficient. Amateur radio enthusiasts around the world can use itfor two-way radio relay communication, data storage and forwardingcommunication, and receive satellite CW beacons.
The CAS-11 satellite will also be equipped with a 2.4 GHz multi-modeamateur radio satellite beacon transmitter, which is designed and built byuniversity students, high school students and primary school students fromBeijing Donggaodi Science and Technology Museum and Beijing University ofPosts and Telecommunications under the guidance of CAMSAT. This is anunprecedented satellite project in China. It has brought opportunities forlearning and practicing amateur radio and amateur satellites to students ofall grades from elementary school to university, and promoted theapplication of amateur radio in space. This 2.4 GHz experimental beacontransmitter 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 students’ knowledge, skills and interests inamateur radio satellites. All transmission modes operate at 2.4 GHz, andthe working modes are converted by the on-board computer program and groundremote control commands. It can work in the following modes: CW TelemetryBeacon, 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 theflash memory on the satellite. The builders have designed a simple remotecontrol system based on DTMF commands. Amateur radio enthusiasts around theworld can send DTMF commands to download the photo catalog and all photostaken by all cameras.
Anticipating a launch in September, 2025 into a 536 km polar orbit fromHaiyang Sea Launch Platform, Shandong, China.