Home Theater Questions? Ask a Technician for Answers ASAP
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Sorry to hear you’re having trouble.
Dave, in this case you can certainly use an external/aftermarket sat radio tuner. You are correct it won't have the 8 pin anymore.
It will still work with the red/white, it will still work in surround to all the speakers, but you won't have control over the stations from the denon remote (the sat tuner may have its own remote for tuning however) and it won't output any display (artist/album/track) to the tv unless the sat tuner also has a video (yellow) output cable.
I'm not sure what model denon you have, presumably a fairly old one though since it had the 8 pin.
What you might consider is upgrading to a newer denon model, which has a built in network based satellite ratio function (sirrius works through the internet, rather than a satellite antenna) and gives you full control over the stations, gives full display info, even control from your smartphone/tablet. I can advise on some options there, if you'd like.