[riot-notifications] [RIOT-OS/RIOT] drivers/mrf24j40 : lower TX power on modules with PA/LNA enabled to s… (#16549)

Carton32 notifications at github.com
Wed Jun 16 09:46:29 CEST 2021

We should not allow the use of channel 26 for all MRF24J40 modules. It's clearly stated in the datasheets for MRF24J40MB/MC and I noticed this channel is still out of ISM band at my notified body FAR for MRF24J40MD at some TX power levels. Contrary to MRF24J40MB/MC, nothing is stated in MRF24J40MD/ME datasheet to keep radio conformity (RED or FCC) but, still, not ok for channel 26.

Now, as nothing is stated about TX power in MRF24J40MD/ME datasheet to keep conformity during use, and I didn't measured the TX power before lowering the setting in RFCON3. I can just say that my MRF24J40MD test in FAR with RFCON3 = 0x38 (17.9dBm theoretically) gives a measured Perp of 10.73dBm. I don't know if we can compare both values as I'm not an expert in this field.

So maybe, the easiest way to "fix" this situation is : 
- to ignore MRF24J40MB/MC models as they are either "End of life" or "Not recommended for new designs" since a long time. Maybe we could also add a warning about this in a comment ?
- adapt `dbm_to_tx_pow` for MRF24J40MD/ME models if needed as you suggest
- disallow usage of channel 26

What do you think ?

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