I hadn't thought of trying a high-speed VHF/UHF modem :) Maybe that's because I live away from what most people call civilization and there aren't many VHF/UHF signals around here.
I'd figured on using a CPU personality for overall control, and doing the "work" in hardware. Is the Spartan-3E starter kit (Digilent/Xilinx) the one you're using? 73, - ps John B. Stephensen wrote: > The ADC and DAC are certainly adequate for audio so it will work. > > I've been interested in VHF and UHF high-speed modems so I have > a starter kit outfitted with a high-speed ADC and DAC that plug into J3. > So far I've tested the DDS and am in the middle of testing the second > version of a 16-bit soft MCU. After that, I have a lot of Verilog code > imported from a Spartan-3 project and converted from ISE 7 to ISE > 10 that needs to be integrated and tested. That should eventualy result > in an OFDM modem that operates at up to 2 Mbps. Real-time signal > processing is done in dedicated modules for filtering, FFT and CORDIC, > but in this design the soft processor is to handle everything between > the FFT and the Ethernet port. Think of it as an Intersil HSP50214 plus > an FFT and MCU in one FPGA. > > The soft MCU would probably be enough to process 8 ksps audio for a > modem as it has a MAC instruction. 3 or 4 would fit in an XC3S500E. > > 73, > > John > KD6OZH
