I recently began scanning in Philadelphia and seem to be having trouble picking up the Ambulance-Hospital reports. My scanner (WS1065) is receiving signal from the city trunked system as I am picking up police/fire dispatch fine, but for ambulance reports, there is essentially nothing coming through. Given the amount of time the scanner has been on, a lack of activity is very unlikely to be the explanation. I double-checked the frequencies and talk groups and they are correct based on the RR database. The database also indicates that these talk groups are not encrypted. Do I need to include any frequencies besides the control frequencies? Any suggestions would be appreciated!