Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_1949746_1 ( call_sign VARCHAR, frequency VARCHAR )

### Question ###
When 1180 am is the frequency how many call signs are there?

### Accurate SQL ###

SELECT COUNT(call_sign) FROM table_1949746_1 WHERE frequency = "1180 AM"