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_name_52 (frequency__mhz_ VARCHAR, type VARCHAR, call_letters VARCHAR)

### Question ###
Frequency (MHz) that has a Type of primary, and a Call letters of ktbb-fm has what total number?

### Accurate SQL ###

SELECT COUNT(frequency__mhz_) FROM table_name_52 WHERE type = "primary" AND call_letters = "ktbb-fm"