How to achieve 2MHz bandwidth for FCC unmodulated test using radio_test

RE: How to achieve 2MHz bandwidth for FCC unmodulated test using radio_test

KF_HK — Thu, 28 May 2020 04:42:37 GMT

Hi Andreas,

I wanna to have your help

How can I modify to achieve ~3MHz 99% OBW?

RE: How to achieve 2MHz bandwidth for FCC unmodulated test using radio_test

amarchand — Thu, 05 Mar 2020 14:12:14 GMT

Thank you Andreas. Our Compliance team was incorrect in thinking the unmodulated needed to occupy a 2MHz bandwidth. This is not an issue.

Best Regards,

Drew

RE: How to achieve 2MHz bandwidth for FCC unmodulated test using radio_test

Andreas — Thu, 05 Mar 2020 09:46:59 GMT

Hi Drew,

Not quite sure what you are testing against here, in which clause is this a requirement? Normally 6dB bandwidth is against a >500kHz requirement, to pass this you need to use the 1Mbps BLE mode (not 1Mbps NRF mode). If you are using an older SDK (v15.0 or earlier) this by default uses NRF mode, you need to change that in the source or use a newer version. The 1Mbps BLE mode also has a ~1MHz 99% bandwidth, to increase to 2MHz you need to use 2Mbps BLE mode.

Still, this is only with a modulated carrier, an unmodulated carrier is just a tone with BW << 1MHz.

Best regards,

Andreas