Bluetooth Certification in korea

[zcmm]

Hi，

I have the following setup

Chip: nrf51822 chip
SoftDevice: S110
Firmware: dtm exmaple.

I use device test Bluetooth certification in korea(RF output from our device attanna from L1)， but the lab give me this clusion:

Unnecessary emissions should be less than -30 dBm when measured at 100 kHz resolution bandwidth at frequencies outside the frequency range.

The intensity of the radio wave emitted from the receiving equipment is the same as that of the receiving antenna.

It shall be less than or equal to -54 dBmW when measured using a pseudo-aerial circuit.

How do I solve this issue?

[bjorn-spockeli]

The measurement is performed at the wrong point in the RF circuit. The harmonics are filtered by C5, C4, L2 and C6, thus it is no wonder that the measured values are to high.

Inform the test lab that the measurement should be done at the C6/C4/L3 - junction and not the L1/L6- junction.

Best regards

Bjørn

[zcmm]

thank you very much.