The S2DR HRTX from Augustus Aerospace Company is a Software Defined DVB-S2 Transmitter. It operates in the X-band from 8.025 to 8.4 GHz with optional S-band support from 2.2 to 2.3 GHz. This transmitter has symbol rates of up to 60Msym/s and supports data rates up to 267 Mbps in a 72MHz spectrum allocation. It is based on a powerful Xilinx ZYNQ 7035 SOC processor (dual ARM® 9 cores, Kintex® 7 FPGA) and has a serial flash memory capacity of 16 MB. The transmitter provides 28 modulation and coding schemes, enabling flexible link design and effective link robustness/link rate tradeoffs. It supports DVB-S2 waveform with powerful DVB-S2 multi-rate LDPC+BCH codes along with a variety of modulations (QPSK, 8PSK, 16APSK, 32APSK) that provide coded spectrum efficiencies of up to 4.4 b/s/Hz.
The S2DR HRTX provides an average transmit power of 1 W and has a typical Error Vector Magnitude (EVM) of less than 6%. It includes 25 pin micro-D interface connector for power, command and control UART, diagnostic UART and data interfaces and a micro-USB 2.0 interface for testing. This transmitter requires a DC power supply of 12 V and consumes 23 W of power. It is available in an enclosure that measures 10.0 x 10.0 x 2.614 cm and has NTIA-compliant emissions. The transmitter is ideal for applications such as high-rate LEO space-to-ground mission data links, high-rate inter-satellite links, and flexible/reprogrammable mission data transponders.
