user: Question: What is the Ch1 in the region served by Central Tablelands?
Columns: ['Region served', 'ch 1', 'On-air date', 'Analogue Power', 'Digital Power', 'Analogue HAAT', 'Digital HAAT', 'Transmitter Location']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Canberra', '31 ( UHF )', '31 March 1989', '600 kW', '50kW', '362 m', '362 m', 'Black Mountain']
SQL:

assistant: SELECT "ch 1" FROM "Table" WHERE "Region served" = 'Central Tablelands';