Executing Class Two Permissive Changes for Substituted Host Antennas
Substituted host antennas qualify for Class II Permissive Changes only when peak gain stays below certified limits and radiative physical structure remains identical.
Simultaneous Transmission Sweep
Meaning
Testing procedures that measure the combined electromagnetic output of multiple radio transmitters operating at the same time identify potential interference and safety violations. A simultaneous transmission sweep is a requirement for devices like smartphones and gateways where Wi-Fi and cellular radios share a single enclosure. This analysis detects intermodulation products that fall into protected frequency bands or exceed maximum permissible exposure limits for human safety.
Harmonics Analysis
Radios operating together can create new signals at frequencies that neither radio uses on its own. These unwanted signals result from the mixing of the primary carrier frequencies in non-linear components.
Power Summation
Total radiated energy is the sum of the power from all active transmitters. Regulatory limits for human exposure are based on the aggregate energy levels. The test measures how much energy a user is exposed to when all radios are transmitting at maximum power.
Final results provide the necessary data for specific absorption rate calculations.
Interference Detection
Receiver sensitivity often drops when a second radio starts transmitting in the same device. This desensitization occurs because the high power of one transmitter leaks into the sensitive front end of another. Identifying these conflicts allows the software team to implement co-existence filters.