Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_2638104_1 (signal_power VARCHAR, callsign VARCHAR)
### Question:
What is the signal power for JOAB-DTV?
### Answer:
SELECT signal_power FROM table_2638104_1 WHERE callsign = "JOAB-DTV"