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For a university project (non commercial) I am designing a PCB that uses a nRF24L01P.

I read a number of forum threads (such as FCC certification for nrf24l01+) where the need of an FCC approval is discussed.

Needless to say, the band I'm using is the 2.4-2.4835GHz band.

My understanding is that this document https://www.ecfr.gov/current/title-47/chapter-I/subchapter-A/part-15 regulates transmission in the 2.4-2.4835GHz band, and §15.23 states that for home-built equipment no authorization is required (provided one designs using the best engineering practices).

I was wondering if a university project could still be considered as a "home-built" environment therefore §15.23 applies.

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    \$\begingroup\$ Close enough for Gov't Rules. For bonus points you could include a way to measure degradation of SNR on BT or Wifi as I once did with an XP wireless radar app that measured the Wifi signal in dBm and SNR on any Wifi signal thru the RSSI in the modem. \$\endgroup\$
    – D.A.S.
    Commented Nov 12 at 21:01
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    \$\begingroup\$ A spectrum analyzer a scope probe will tell you how much radiation you have from your power supply, and ARM clock etc. \$\endgroup\$
    – D.A.S.
    Commented Nov 12 at 21:13
  • \$\begingroup\$ thanks a lot man! it's actually a full fledged cross-university project, not just a class project, but I can definitely implement your suggestions as that's going straight to my dissertation. You'll be mentioned in the acknowledgments "for the many fruitful discussions on RF engineering" :D \$\endgroup\$
    – Francesco Bernardini
    Commented Nov 13 at 4:03
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    \$\begingroup\$ You can even include properties of BER vs Bd rate vs SNR from distance r^2 or Ricean Fading which disperses faded delayed reflections off every surface that isn't free space. Then how to recover 3 dB just below threshold from antenna tuning and adding reflectors will improve your BER by decades. Even DIY antenna boosters on youtube. Gnd = 0V except when current passes thru ESL with the log (len/wid) ratio like 0.8 nH/cm +/-50% and 1 to 3 pF/cm for grounded traces. Tinned brass shields can be bought too will add pF like embedded coplanar waves. and reduce emissions. A probe measures V/m. \$\endgroup\$
    – D.A.S.
    Commented Nov 13 at 15:34
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    \$\begingroup\$ The FCC measures RF quasi-peaks with an LPF in the audio band, like 15 kHz for the video BW for sweeps, because it was all about audio interference back in my day. \$\endgroup\$
    – D.A.S.
    Commented Nov 13 at 15:38

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