CC1200: PSD test in FCC is not working

Hi,

Please could you give details of your test procedure (test setup, which applicable test method you are using, ect.)? Could you attach a screenshot of your measurement(s) as well if possible?

Regards,

Zack

we are performing fcc part 15 sub part C  PSD test on CC1200 . according to FCC our Specs. for PSD should be less than 8dBm/3kHz over Occupied bandwidth more than 500kHz. we are able to meet Occupied band width specs. but not able to meet PSD specs.

Thanks for the information.

Without knowing more about the PHY being used, ect. - have you looked at SWRA123 (CC11xx Settings for FCC 15.247 Solutions): https://www.ti.com/lit/swra123 to get an overview of the expected performance for a range of preferred settings?

Regards,

Zack

Hi, 

we have looked in SWRA123 PDF and used below specs in spectrum analyzer

here we have kept data rate as 19.2 kbps and in CC1200, we don't have PATABLE register.

Is there any register settings for CC1200 that affects PSD test. 

To get a 500 kHz bandwidth you want higher datarate. Have you looked at https://e2e.ti.com/support/wireless-connectivity/other-wireless-group/other-wireless/f/other-wireless-technologies-forum/267014/cc112x-or-cc1200-fcc-15-247-compliance and https://e2e.ti.com/support/wireless-connectivity/other-wireless-group/other-wireless/f/other-wireless-technologies-forum/305047/cc1200-settings-to-meet-fcc-15-247-wideband-modulation-requirements ? 

Also the flatness of the spectrum is given by the modulation factor so playing a bit with the deviation for a given datarate would be a good idea.