For starters, welcome aboard
The version of RSRDC you're looking for is RSRDC_TMO_V502, and you can download it
here
Regarding calculating and plotting manual torpedo solutions and such, make sure you check RockingRobbins's "
Sub Skipper's Bag of Tricks--Techniques, tactics, tutorials, videos " thread, found
here. I found his video explaining the Cromwell Targeting method extremely useful.
As for radio stations, I'm afraid I can't help. The man you need to ask (our resident radio DJ, if you will) is fred8615. Try asking in his Radio Stations mod thread, found
here.