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This is the CXADC Wiki written and maintained by Harry Munday (harry@opcomedia.com), Inside this wiki and its pages, you will find general information alongside technical guidance and notations for modifying CX Cards, and obtaining effective captures of signals with them.
Takes the cheap and common Conexant CX2388x series of video decoder/encoder chips found on PCI/PCIe TV/Capture cards and turns them into an SDR capture card via simple driver replacement.
At default, this is 28.6msps stock with 40msps possible on almost all cards via replacing a simple timing crystal (up to 54msps possible).
Crystal Mhz = Max MSPS rate. (2x MSPS = 1Mhz of bandwidth)
These CX Chips have a testing mode called RAW16 that allows continuous raw samples to be output to file this is how they are used as an SDR alongside their wide input range ment for CVBS/Broadcast signals.
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FM Media Capture
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SDR Radio
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Software Ossiliscope
The driving force behind the continued development of the CXADC driver and testing/modifying of new PCIe cards is due to the VHS-Decode, LD-Decode and HiFi-Decode project's capturing raw FM signals off analogue media for full lossless archival.
This driver is currently limited to 256 CX Cards per system.
The Driver supports both 8-bit and 16-bit sampling (10-bit ADC)
Signal centring or DC offset control is supported.
Windows support, currently, there is only a raw driver for Linux, but we hope to make a version for Windows in the near future.