Microwave Backward Wave Oscillator Tube from Mexico
Backward wave oscillator tubes generate tunable microwave signals for test equipment and radar. HTS 8540.89.00 includes these velocity-modulated tubes producing electromagnetic waves through backward wave interaction.
Duty Rate — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Frequency tuning range and output power specifications critical
• Magnetic field strength requirements for operation documented
• Avoid classification under signal generators (9030.82)