BCD436HP P-25

I am trying to listen to Polk County Texas, I know that everybody says P-25 is a P-25 system no matter who makes it. Polk Couty Texas is a ICOM P-25 system and they are garbled, I can program a motorola P-25 system and everything is fine. What do I need to do to be able to monitor a Icom P-25 system with my BCD436HP ???



Thanks Much