DTM without external clock source

RE: DTM without external clock source

sage — Tue, 04 Oct 2016 09:42:03 GMT

I have just submitted a support case with the hardware design files. please take a look at it and let me have your opinion as soon as possible. Thanks alot

RE: DTM without external clock source

sage — Tue, 04 Oct 2016 07:50:20 GMT

we are using nRF51822 extended temp version

RE: DTM without external clock source

sage — Tue, 04 Oct 2016 07:48:23 GMT

Yes, it is a requirement from KC program. we'll open a ticket in the support site rather than open our design file.

RE: DTM without external clock source

FormerMember — Tue, 04 Oct 2016 06:19:36 GMT

Okay, I see. Are you testing against the Korean teleregulatory requirements? Which chip do you use, nRF51 or nRF52?

I could be very useful to see your schematic and layout (altium or gerber files). Could you upload it here (if it is okay to make it public) or create a new support case from www.nordicsemi.com and refer to this thread?

Note: For testing the radio it is easier to use the radio test example in the SDK.

RE: DTM without external clock source

sage — Tue, 04 Oct 2016 01:26:48 GMT

Hi, The reason why Jake asked this question is due to the spurious emission fail. We are under certification testing but failed. the test item is measuring the spurious emission during RX mode. the specification requests -54dBmW however, my board shows -52.28dBmW@channel 0(2402MHz). the testing was conducted using DTM firmware with nRFgo studio application. we set the TX power @ 4dBm

Could you please give us any tip on this?

RE: DTM without external clock source

FormerMember — Mon, 03 Oct 2016 08:40:51 GMT

The LFCLK (32 kHz clock) is not used when using the DTM example in the SDK. Therefore, no modifications to the code are needed when using the internal 32 kHz RC oscillator.