ESP32-C3 LNA

[Randy222]

ESP32-C3
Anyone know what the LNA can tolerate in terms of reflected power on Tx? Any documentation for it?

[Gribo]

Page 61 of the datasheet - Maximum RX power is 0dBm.

[Randy222]

I see that chart, some 802.11 modes are 5dbm, others 0dbm.
But maybe ESPRESSIF should put values into a "MAX" table into the "max" column and not the "typ" column. Would make more sense.

It can Tx 20dbm and tolerate 5dbm on reflection. 3:1 ceramic antennas are on verge of cooking the LNA end of the chip when max Tx pwr is set, and that's using the 5dbm max Rx !! On the 0db(max) freq the ceramic antenna has to be better than 1.58:1, yeah fat chance!

I did read a few online posts about bad wifi performance issues for ESP32-C3, I suspect maybe people are setting max pwr Tx and the LNA cooking to fail due to bad antenna.