The Pinnacle PCTV Sat is a card that is supported in linux for long time. LibreELEC didnt support it. Seems like drivers are missing.
This are the things that have to be loaded to support the card:
DVB-S – wiki.archlinux.de
both drivers does not seem to be activated for example here:
LibreELEC.tv/linux.x86_64.conf at 3fb896a3b8c59048b71c68c148c4a35c813ee540 · LibreELEC/LibreELEC.tv · GitHub
Please enable those 2 drivers so the card can be used with libreelec.