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.
sub-1GHz Short Range Device
Meaning
Low-power radio frequency transmitters operating in unlicensed spectrum bands below 1 GHz support long-range, low-data-rate wireless communication links for industrial, scientific, and medical applications. A sub-1GHz short range device utilizes sub-gigahertz frequencies such as 868 MHz in Europe or 915 MHz in North America to achieve superior signal penetration through walls and obstacles compared to 2.4 GHz radios. These devices operate under strict duty cycle limitations or listen-before-talk protocols to ensure fair spectrum sharing among uncoordinated nodes.
Low-Frequency Propagation Characteristics
Sub-gigahertz signals experience reduced free-space path loss and favorable diffraction properties around obstacles. Designing a sub-1GHz short range device involves optimizing small antenna form factors, where physical dimensions are constrained relative to the longer wavelength. Module integrators balance antenna efficiency against compact PCB layout requirements to achieve optimal link margins in smart metering or sensor network deployments.
Duty Cycle Limit
Transmission time constraints restrict individual node duty cycles to small fractions of an hour.
Spectrum Access Regulation
Regional telecommunications authorities impose strict limits on effective radiated power and channel bandwidths. A sub-1GHz short range device must comply with regional harmonized standards to maintain operational authorization. Deploying non-compliant transmission power or violating spectrum access rules results in severe co-channel interference and regulatory enforcement action.