How can I get my new receiver to decode the AC-3 s

I am back... My friend sais you will need the RF adapter. He has a Kenwood 990D player that has a coaxial output like a DVD player (also the RF). So he does not need the adapter. Pioneer made a few later players this way also. If you don't want to spend the $100 for the RF adapter you could look on eBay for another machine.

Also Pioneer currently makes a DVD/LD combination player. The regular DVD coax output works for laserdiscs also.

Thank you to everybody who responded, you have all been most helpful.

For future reference, this is a great explanation

http://www.precisionlaserdisc.com/newfaq.html