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CC1120: FCC: please give me your thoughts what I should care about

GGA
Genius 3985 points
Part Number: CC1120


Hi,

using CC112x (434MHz band, in TI standard schematic) since years in EMEA I had no problems, to mark the CE according to the ENxxx rules on our RF modules.
These modules operate in the default 'silly' mode just as a modem: a max. 4kHz data signal modulates an GFSK RF <-> and vice versa for the receiver.

Now a customer wants us to go for FCC, using Part90 mobile land, 460Mhz band. Means we will get an FCC marking through a US testhouse, and customer will declare on his electronic 'contains FCC part90 device'.

I'm pretty far in that process and got an overview of what the US will measure:

Required Tests using TIA/EIA 603 as a guide:

2.1046 (RSS-GEN 6.12 and RSS-119)         RF Conducted Pout

2.1047                                                                  Modulation Characteristics

2.1049 (RSS-GEN 6.7 and RSS-119)            Occupied Bandwidth

2.1051 (RSS-GEN 6.13 and RSS-119)         Antenna Conducted Spurious Emissions

2.1053 (RSS-GEN 6.13 and RSS-119)         Field Strength of Spurious Emissions

2.1055 (RSS-GEN 6.11 and RSS-119)         Frequency Stability (over voltage and temperature)

Not such a big deal, I thought, compared to the RED EN300.220. But then I got the ANSI C63.26 document, read through it and now I'm unsure if this could be an issue.

This is quite a large document with very in-depth regulations, just e.g. on Transient measures, which goes beyond the comparable CE-section..

My question: if I have been fine within CE AND using TI defaults, do I have to go through all this documentation OR will such a module simply pass the FCC tests?

thx. a lot in advance

  • 0
    TI__Guru**** 317180 points

    ETSI and FCC are two different standards that focus on slightly different things. Meaning that a design that pass one of them doesn't automatically comply with the other. 

    I have looked at the TX mask in part90 but not the rest of the requirements. For the most part I have looked at part15. Normally I look into https://www.ecfr.gov/current/title-47/chapter-I to get a overview and if something is unclear, go into the other documentation available. In other words, read the documents and paragraphs that gives the best overview first. Did the lab point you to the documents you are currently looking into? The lab should know what they need to test and hopefully it will be possible to get a guideline on what you need to test for pre-compliance.