Citizen CB1 Series Instruction Manual page 24

Notes on the time signal reception
Poor reception areas
It may be difficult to receive the time signal properly under certain environmental
conditions or in areas susceptible to radio noise.
• Extremely hot or cold locations
• Inside vehicles
• Near electrical equipment or office
appliances
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• Near high-tension electrical
lines, railway overhead wires or
communication facilities
• Inside reinforced concrete
buildings, between tall buildings,
mountains, or underground
• Near mobile phones that are in
use