Radio Equipment Directive Host Integration Testing Procedures and Technical File Assembly
CE module approvals do not cover host integration; host manufacturers must execute physical delta testing and compile a full RED Technical File.
Field Strength Limits
Meaning
Statutory boundaries on electromagnetic radiation levels prevent telecommunication transceivers, intentional radiators and digital computing devices from causing unmanaged interference across adjacent radio spectrum. Prescribed field strength limits define maximum allowable microvolts per meter or equivalent power densities across calibrated measurement distances from the equipment under test. Regulatory commissions enforce these values across designated commercial, industrial and residential operating bands to protect licensed communications services.
The restriction governs radiating antennas, trace leakage, enclosure seam emissions and peripheral cables, stopping where electromagnetic compatibility rules yield to biological exposure limits governed by specific absorption rate thresholds.
Radiated Boundary
Regulatory frameworks distinguish between intentional emissions produced inside operating channels and spurious harmonics escaping the chassis. Inside passbands, field strength limits permit higher power levels to establish wireless link connectivity over required working distances. Spurious radiated boundaries apply stringent attenuation curves, often capping emissions above one gigahertz at fifty-four decibels microvolt per meter at three meters distance.
Shielding effectiveness across housing seams and connector cutouts determines whether high-speed memory buses and digital display lines remain within legally compliant emission profiles.
Receiver Degradation
Unchecked field emission disrupts nearby cellular, satellite navigation and industrial sensor operation. Radiated harmonic energy originating from unscreened microcontroller clocks can couple into sensitive radio receiver antennas sharing the same printed circuit assembly. When emission boundaries are exceeded, receiver noise floor levels rise, triggering packet retransmissions and lowering communication data rates.
Hardware engineers place planar ground planes, surface mount ferrites and stamped metal cans over high-speed clock circuitry to suppress parasitic emissions before external testing occurs.
Compliance Margin
Certification reports document radiated emission profiles obtained inside anechoic chambers across three-meter or ten-meter calibrated baselines. Test engineers verify peak, quasi-peak and average detector values against the applicable normative curve. Maintaining a six-decibel margin beneath the legal emission envelope provides sufficient headroom to cover standard manufacturing variations and component tolerances across high-volume production.
Failure to meet these legal thresholds prevents equipment distribution and can trigger mandatory recall orders from national spectrum authorities.