Interpretation of RF test items in CE certification of analog walkie-talkies

    At present, the common analog walkie-talkies on the market generally use FM modulation, with an operating frequency of more than 100 MHz and more than 400 MHz, and a maximum power of approximately 5 W. The relevant personnel of Moore Lab briefly explain the common RF test methods for analog walkie-talkie products in CE certification based on actual test cases.

    The radio frequency (RF) standard for analog walkie-talkies in CE is: EN 300086-2.

    1. Transmitter part

      1.1 Frequency Error

        1.1.1 Test layout:         1.1.2 Test limits:
 

        1.1.3 Test case display:

      1.2 Transmitter Power (Conducted)

        1.2.1 Test layout diagram:

        1.2.2 Test limits:

        At normal temperature and pressure, it is ±1.5dB of the rated power, and the extreme conditions are between -3dB and +2dB of the rated power.

        1.2.3 Test case display:

      1.3 Adjacent and alternate channel power

        1.3.1 Test layout diagram:

   

        1.3.2 Test limits:

        The difference between adjacent channels is greater than 60dB, and the absolute value is less than -37dBm;
        the difference between alternate channels is greater than 70dB, and the absolute value is less than -37dBm;

        1.3.3 Test case display:

      1.4 Unwanted emissions in the spurious domain

        1.4.1 Conducted Spurious Emissions

          1.4.1.1 Test layout diagram:

      

          1.4.1.2 Test limits:

          1.4.1.3 Test case presentation:

  

        1.4.2 Spurious radiation

          1.4.2.1 Test layout diagram:

      

          1.4.2.2 Test limits:

          1.4.2.3 Test case presentation:

  

    2. Receiver part

      2.1 Maximum usable sensitivity (conducted) Maximum usable receiving sensitivity

        2.1.1 Test layout diagram:
 

        2.1.2 Test limits:

        The sensitivity must be less than or equal to EMF 6dBμV at normal temperature and pressure;

        Under extreme conditions, the sensitivity must be less than or equal to EMF 12dBμV;

        2.1.3 Test case presentation:

    

      2.2 Co-channel rejection

        2.2.1 Test layout diagram:

        2.2.2 Test limits:

        The limit of 12.5KHz channel width is -12dB ~ 0dB;

        The limit of 25KHz channel width is -8dB ~ 0dB;

        2.2.3 Test case presentation:

      2.3 Adjacent channel selectivity

        2.3.1 Test layout diagram:

        2.3.2 Test limits:

        2.3.3 Test case display:

      2.4 Spurious response rejection

        2.4.1 Test layout diagram:

  

        2.4.2 Test limits:

        The spurious response suppression ratio cannot be less than 70dB.

        2.4.3 Test case presentation:

      2.5 Intermodulation response rejection

        2.5.1 Test layout diagram:

  

        2.5.2 Test limits:

        The intermodulation response suppression ratio cannot be less than 65dB.

        2.5.3 Test case presentation:

      2.6 Blocking or desensitization

        2.6.1 Test layout diagram:

  

        2.6.2 Test limits:

        The blocking level cannot be less than 84dB.

        2.6.3 Test case presentation:

      2.7 Spurious radiations

        2.7.1 Test layout diagram:

        2.7.2 Test limits:

    

        2.7.3 Test case presentation:

    The above are the main contents of the RF test items involved in the CE certification of analog walkie-talkies. It should be noted that the transmission power of walkie-talkies is relatively large, and necessary attenuators must be used in the test.