CREATE TABLE table_name_41 (frequency_mhz VARCHAR(255), city_of_license VARCHAR(255), erp_w VARCHAR(255))
What is the total Frequency MHz Port Charlotte, Florida, which has an ERP W larger than 10, has?
    
SQL: SELECT COUNT(frequency_mhz) FROM table_name_41 WHERE city_of_license = "port charlotte, florida" AND erp_w > 10