Hi,

sorry, no answere to your question but very interested about where you
get a orion board.
Is there a way to get them without the rest of the anan hardware?

You can build one yourself: like the dc6ny
http://www.hamsdr.com/data/GlobalFileUploads/9636__RF%20Sampler%20for%20Pre.pdf
Flat freq. response (<1dB), 50Ohm's, set the attenuation to your need etc.