How to connect spectrum analyzer with NRF52840-DK?

RE: How to connect spectrum analyzer with NRF52840-DK?

awneil — Wed, 17 Jul 2019 13:43:54 GMT

You're hijacking a 2-year-old thread with an unrelated question.

Start a new thread for a new question!

RE: How to connect spectrum analyzer with NRF52840-DK?

Ronald Reichmuth — Wed, 17 Jul 2019 13:30:07 GMT

Hello Jørn, if we connect a 50Ohm external Antenna to J1 do we need to cut the PCB antenna. Or what do you mean 'works as a switch' I would like to deactivate the PCB Antenna...

RE: How to connect spectrum analyzer with NRF52840-DK?

soumil — Mon, 25 Sep 2017 11:57:53 GMT

Thanks Sigurd.

RE: How to connect spectrum analyzer with NRF52840-DK?

Sigurd — Mon, 25 Sep 2017 11:53:22 GMT

Hi soumil,

In order to connect from SWF to BNC, you have to go through a SMA cable/connector, and then you need a SMA to BNC converter. SWF <-> SMA <-> BNC. See this page for the SWF/SMA probe, + need a SMA to BNC adapter.

But note that you should make sure that your oscilloscope actually support 2.4 GHz signal before buying any cables or adapters. Many BNC oscilloscope only support a couple hundred MHz, and is not in the GHz range.

RE: How to connect spectrum analyzer with NRF52840-DK?

soumil — Thu, 21 Sep 2017 13:58:32 GMT

Thanks Jorn. Do you have any suggestions on where can we find such connectors ? Since our oscilloscope has a BNC connector, we want to get a SWF to BNC connector.

RE: How to connect spectrum analyzer with NRF52840-DK?

Jørn — Thu, 21 Sep 2017 13:47:47 GMT

Hello Soumil

Yes you can use the J1 connector to connect the analyzer. It works as a switch and will disconnect the trace antenna when you connect to it. SWF and SMA are not quite the same as the SWF is smaller. Be sure to use cables and connectors designed with a characteristic impedance of 50 Ohm.

Best regards

Jørn Frøysa