SRRC Filing Timelines for a Product Entering China
SRRC radio type approval in China takes 8 to 16 weeks, requiring local agent representation, strict customs sample clearing, and accredited domestic lab scans.
Conducted RF Measurement
Meaning
Signal evaluation performed through a direct physical cable connection between the transmitter and the analyzer provides exact data on radio output. Every conducted rf measurement bypasses the variability of the antenna and the propagation environment to isolate board-level performance figures. This process captures metrics like output power, frequency stability and harmonic distortion directly from the terminal or test point.
Technicians use this method to verify that the core semiconductor module produces the power levels specified in the technical datasheet.
Physical Connection
Precision cables with specific impedance ratings connect the micro-coaxial connectors on the motherboard to high-grade signal analyzers. A conducted rf measurement eliminates the path loss errors associated with over-the-air testing in open labs. Attenuators are placed in the path to protect sensitive test equipment from saturation.
Calibration of these cables ensures the measured data accurately indicates the power at the component pin.
Diagnostic Value
Direct capture allows for the precise measurement of modulation quality without the influence of multipath fading. Engineers rely on conducted rf measurement during initial hardware bring-up to confirm that impedance matching networks are correctly tuned. Any discrepancies in wattage suggest a mismatch at the radio frequency connector rather than an antenna failure.
The signal purity found at the board level sets the maximum possible performance limit for the fully assembled product.
Standard Limit
Global regulatory bodies define power spectral density based on results from a standardized conducted rf measurement sequence. Testing documentation includes photographs of the test setup showing the cable type and the connector used. If values exceed specified limits at the cable head, they are unlikely to pass over-the-air tests.
Data logs from these sequences constitute the fundamental evidence for host integration filings.