dapu
Junior Member level 3
Sorry, it may be a little long post, please feel free to skip to next para. I have been learning electronics, and i came across a 2.4g RF module (XN97L) which got me interested in it. After working, and banging my head with google translate and chinese datasheet of this product, I finally feel confident that I have understood how to use it. Its very much similar to NRF24l01s out there, except it allows me to configure some BB_CAL, RF_CAL etc stuff. I initially started making a project on home automation using this, now after making some progress on it. I plan to use this and try my luck with selling some locally in my country, and in future maybe expand it to big startup. I understand that I need to meet regulations like FCC part 15, ETSI etc. for different countries for this transceiver module.
So what I was wondering is that will this module (XN297L), by any chance will qualify under FCC part 15.247? as GFSK is digital modulation, now given that this module supports "data-whitening/scrambling" and has maximum 13dbm of output power, and I plan to use no more than 8dbm, so no antenna gain is required either. I know it is not possible to say without proper tests and checking all technical stuff, but I am wondering if it will qualify under that digital modulation category, so I can get my product FCC certified in future by making small adjustments etc. In some papers I read online, they say that it is only valid for DSSS, whereas BLE also uses GFSK and it qualifies under digital modulation (not FHSS). Also page 4 of this paper here (https://www.semtech.com/images/datasheet/fcc_digital_modulation_systems_semtech.pdf), assuming same applies to 2.4G also. Please let me know, if I have not put forward my question correctly, and sorry for any mistakes in my understanding if any, as I am still learning about this.
Some details of that module :
So what I was wondering is that will this module (XN297L), by any chance will qualify under FCC part 15.247? as GFSK is digital modulation, now given that this module supports "data-whitening/scrambling" and has maximum 13dbm of output power, and I plan to use no more than 8dbm, so no antenna gain is required either. I know it is not possible to say without proper tests and checking all technical stuff, but I am wondering if it will qualify under that digital modulation category, so I can get my product FCC certified in future by making small adjustments etc. In some papers I read online, they say that it is only valid for DSSS, whereas BLE also uses GFSK and it qualifies under digital modulation (not FHSS). Also page 4 of this paper here (https://www.semtech.com/images/datasheet/fcc_digital_modulation_systems_semtech.pdf), assuming same applies to 2.4G also. Please let me know, if I have not put forward my question correctly, and sorry for any mistakes in my understanding if any, as I am still learning about this.
Some details of that module :
Operating frequency 2400 Mhx to 2483 MHz
Phase-locked loop frequency step 1 MHz
Crystal frequency 16 MHz
Data rate Min 0.25 Mbps Max 2 Mbps
Δf 250K Modulation Frequency Offset @ 250Kbps Typical 125 Khz Max 150 KHz
Δf 1M Modulation frequency offset @ 1Mbps Typical 160KHz Max 300 KHz
Δf 2M Modulation Frequency offset @ 2Mbps Typical 320 KHz Max 550 KHz
FCH250K Channel spacing @ 250Kbps 1 MHz
FCH1M Channel spacing @ 1Mbps 1 MHz
FCH2M Channel spacing @ 2Mbps 2 MHz
PRF Typical Output Power Min 2 dBm , Typical 8dBm , Max 13 dBm
PRFC Output power range Min -35dBm Max 13 dBm