Before you begin:
QMR-KWT 2, RS95S is the third satellite launched by Kuwait, with a 1U cube design. It was developed by Orbital Space.
The amateur radio FM repeater is its primary payload, using a downlink frequency of 436.950 MHz with GMSK modulation and a power output of 2 kW.
Software used: SDR#, Soundmodem, SatDecoder
How to identify the standard used by satellite remote sensing?
For example, this satellite uses GMSK (Gaussian Minimum Shift Keying) and the Sputnik protocol with a rate of 2k4.
Here's another example: ASRTU-1: BPSK (Binary Phase Shift Keying), 9.6 kbps (bit rate)
Many satellites add protocols or other sections to identify themselves or modify the effective data quantity in telemetry frames, making it easier for them to transmit data effectively.
Receive
Regardless of the specific method, an SDR (Software-Defined Radio) is essential. To decode digital telemetry, you need an SDR to record the baseband signal or directly decode it (or use a radio with a center frequency output).
As an accessory, it requires connection to at least one U3 unit, and should be a Yagi antenna (or an antenna with equivalent dBi value).
When you start receiving, you may not see any signals at first. The data packets will be transmitted in batches.
- Baseband signal playback received on 2026/01/18 at 10:05 BJT
Use software to decode
After the digital signal transmission is complete, open the recorded baseband file and set the mode to NFM.
Select the corresponding telemetry frames:
Ensure that NFM's bandwidth fully covers digital signals. Configure the Soundmodem to use GMSK with a data rate of 2k4.
Once the signal from Soundmodem has been decoded
Then, switching to SatDecoder will also allow you to view the decoded telemetry packets.
All telemetry data packets for the RS95S have timestamps, allowing you to see when each packet was transmitted and which data is currently valid.
The signal from this satellite is very strong. The U5 unit's measurement strength is almost as high as a lightning strike, and I am looking forward to the activation of the satellite's repeater!
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