What is the signal power for JOAB-DTV?
CREATE TABLE table_2638104_1 (
    signal_power VARCHAR,
    callsign VARCHAR
)
SELECT signal_power FROM table_2638104_1 WHERE callsign = "JOAB-DTV"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the signal power for JOAB-DTV? ### Input: CREATE TABLE table_2638104_1 (
    signal_power VARCHAR,
    callsign VARCHAR
) ### Response: SELECT signal_power FROM table_2638104_1 WHERE callsign = "JOAB-DTV"