Bill,
You are not getting any replies- here are some reasons:
The search function and database are your friends. Give them a shot.
This forum has a sticky that it is not for specific radios.
I am not in indep.mo nor do I own a PRS600 (have never heard or seen of such a radio) so cannot help you there either.
Seriously, you have a PSR600 there is a learning curve there so be patient, first try searching the Missouri Regional Forum, and then posting if you get no information of use to you. There is information in the database (checked for ya).
I am the nicest but will not the only one who will tell you these things so standby to get flamed if don't try to help yourself first. People here are far more likely to help if you have tried to help yourself first then ask outlining what you have done to find the answer on your own.
If I can be of less assistance, please hesitate to write.
Good luck & Godspeed.