LilacSat-2 – Linux Live CD for Telemetry Decoding

Artists impression of LilacSat-2 in orbit

Artists impression of LilacSat-2 in orbit

LilacSat-2 (CAS-3H) was launched along with eight other XW-2/CAS-3 amateur radio satellites on Saturday, September 19, 2015 at 23:01:14 UT on Beijing’s new Chang Zheng 6 (CZ-6) rocket from the Taiyuan Satellite Launch Center. The satellite, built by students at the Harbin Institute of Technology, has an APRS digipeater and a V/U FM voice transponder which can transmit telemetry data at the same time as voice by using sub-audible tones.



Note: The FM transponder and APRS downlink is 437.200 MHz not that given in the XW-2/CAS-3 Frequency Chart. There is also a telemetry downlink on 437.325 MHz. Further information is given on the LilacSat-2 website Radio Info page.

LilacSat-2 is scheduled to switch on the FM transponder at about 2200 UT each Monday, Wednesday and Friday.

Remember the Doppler shift on the downlink during a pass will be about +/- 10 kHz. If your radio has selectable FM filters use the wider filter designed for 5 kHz deviation FM, sometimes referred to as a 25 kHz channel spacing filter.

LilacSat-2 was deployed into a 528 km by 551 km 97.5 degree inclination orbit. The NASA Orbital Lifetime Software indicates the satellite might remain in orbit for 18 years before reentry into the Earth’s atmosphere.

First LilacSat-2 infrared image Sept 24, 2015

First LilacSat-2 infrared image Sept 24, 2015

Wei Mingchuan, BG2BHC provides this report on the first 16 hours in space:

During the first 16 hours in orbit, we have received nearly 1000 packets of LilacSat-2 from Harbin (BY2HIT), Shihezi (B0/BY2HIT), Nanjing (BI4ST), Xian (Northwestern Polytechnical University) and Singapore (9V1SV). Many thank to all!

Now we have a Linux LiveCD for telemetry decoding released.

We have support for FCDPP, USRP and RTL-SDR. Not hard to edit the GRC flowcharts to support other devices.

It can be burned into a USB stick to boot a computer directly, run from a virtual machine or installed into a hard disk. The User manual is also included.

It can be downloaded from:

LilacSat-2 Live CD also has a magnet link with the help of M6SIG:

More details:

Wei Mingchuan, BG2BHC

Telemetry decoder software on GitHub

Harbin Institute Of Technology Amateur Radio Club BY2HIT
Web in Google English:

Information on the XW-2 (CAS-3) satellites is at

Online orbital predictor (select LilacSat-2)

Satellite tracking information

Adding new satellites to SatPC32, Gpredict and Nova

How to Work FM Satellites