BLE occupied bandwidth too small

RE: BLE occupied bandwidth too small

AmbystomaLabs — Fri, 14 Jul 2017 11:55:38 GMT

Ok. Your testlab should have known the correct settings for the test. You might want to familiarize yourself with how the tests should look. You can download the test report for anything shipping product from the FCC website. Here: apps.fcc.gov/.../GenericSearch.cfm

And for your reference, excluding pathloss offsets, the trace should look something like this: 6dB Bandwidth

RE: BLE occupied bandwidth too small

Hunor Makkai — Fri, 14 Jul 2017 07:48:20 GMT

We are using SDK version 12.1 and S132 softdevice with uint8_t mode = RADIO_MODE_MODE_Nrf_1Mbit; I try to modify mode to RADIO_MODE_MODE_Ble_1Mbit and i send feedback to test lab to change RBW and VBW parameters of correct values. Thanks

RE: BLE occupied bandwidth too small

AmbystomaLabs — Thu, 13 Jul 2017 20:43:13 GMT

Also, your test lab seems to be testing to the wrong standard. BLE is tested as DTS and the bandwidth requirement is greater than 500kHz (not 1MHz) for RBW/VBW of 100kHz/300kHz not 30k/100k as shown in your plot.

RE: BLE occupied bandwidth too small

AmbystomaLabs — Thu, 13 Jul 2017 20:33:03 GMT

Which SDK are you using the radio_test example out of? And,did you change the default modulation to BLE from Nordic Proprietary? Near top of main.c: static uint8_t mode_ = RADIO_MODE_MODE_Ble_1Mbit;

As for your waveform above, it doesn't even look like a BLE waveform. This subject has come up before with people testing 6dB bandwidth and the solution is always using the correct software.