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What is the correct Tx mode for FCC 15.247 tests?

cleidigh
Prodigy 140 points

I am working on a CC2520-CC2591 design and trying to do bench tests for pre-compliance testing.  In review of AN0065 and AN0032 it is not clear to me if the conducted (and radiated) spurious emissions test are done with a modulated or non-modulated signal.  Figure 7.1 of AN0065 looks like it was modulated signals.  My test results are fairly close to the TI EM board results if I use modulated.  If I do the test unmodulated then the results are resonably worse.

 

Does anyone have any info on appropriate test setups for the FCC tests.  AN0032 is still not very clear on some of these things.

 

Thanks in advance,

 

Chrisotpher

  • 0
    Intellectual 740 points

    I am pretty certain that the certification process relates to the modulated spectrum, as this is the characteristics of the signal that is intentionally transmitted when the device is in operation normally.  Also, within the FCC regulations the output power and spectral measurement requirements are specific to the modulated spectrum (spread spectrum operation).

     

  • 0 in reply to RFCE
    Intellectual 805 points

    Normal transmissions should be used, no test signal. That is, transmit your normal application packets, with normal output power and modulation.