Yep. I've seen the recorders. Unfortunately the ones that are able to record two channels simultaneously can only record channels from the internal tuner. With two external signals it's unfortunately still no go. I guess getting a receiver should be fine as well if it's able to perform the desired task.
It's the same with some dvd's that actually have a dvb-t receiver. You can record two channels at the same time but it has to be two channels from the internal tuner...
Thank you anyway.
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3D:100" passive projector polarized setup + 22" IZ3D