EWC29 CLASS 3 (& CLASS 2) is a reliable, high performance & low power consumption S-band transponder, which was developed by CNES (French Space Agency) and Syrlinks for medium-size platforms. The 1st Generation of SYRLINKS S Band transceiver is named EWC15 and was co-designed with CNES in 1997, based on a innovative and reliable concept using qualified COTS and stressing tests on Qualification Model units. EWC15 has been already launched in numerous and famous missions, such as ROSETTA, DEEP-IMPACT, DEMETER, PARASOL, ... Up to day, more than 20 missions and LEO FM units.
Since 2014, Syrlinks offers a 2nd generation of S Band transceiver and transponder, named EWC29, based on space qualified components and fully compliant to ECSS-Q-ST-60C CLASS 3 standard.
Doppler (Coherent Mode) and Ranging features are available as options.
For the transmit section, EWC29 operates in the 2200–2290MHz range. The RF output power can be adjusted from +27 to +37 dBm with data rate from 10kbps to 5 Mbps (options). For the receiver section, EWC29 operates in the 2025–2110MHz frequency range at a data rate which can be selected in the range from 8 to 256kbps.
Design of product includes independent internal parts:
- Transmitter (TeleMetry - TM),
- Receiver (TeleCommand - TC) and duplexer.
Both functions are independent and include each one an isolated DC-DC converter with a 22/37V input range. Some “electronic fuses” are also implemented on board in order to switch-off some power lines in case of latch-up – or over current consumption – due to space radiations.

Parameter Name	Parameter Value
Network	RF FM satellite
Applications	telemetry tracking
Other characteristics	high-performance compact low-power