This is my first post at this Forum. Hopefully someone can help/support me with this urgent issue.
The problem is that the module shows a lot of unwanted transmissions during start-up, causing the FCC certification to fail.
As the attachment shows, the transmissions are unexpected and not inside the FCC regulations. According the FCC, transmissions outside the blue lines are not allowed.
> I'm using the ESP-WROOM-02 module.
> Latest SDK (also tried previous versions)
> Even deleted every WiFi SDK link, without success
> Try starting up with WiFi disabled, no success
> Tried different power supplies, no success
> The phenomenon is also visible during a restart from deep sleep
> After restart, so from the first line of the initialization/setup(), I have full control without issues.
At this moment I'm out of ideas how to solve this problem. I expect it's a ESP hardware issue, but not sure.
Is there anyone who can help me with this or is there anyone who have seen this problem before?
You can download and test the "ESP8266 Certification and Test".
It happens only at startup. Just a fraction of time, after that there is no problem. The time is that short, that the spectrum analyzer not always captures the signal.
The problem occurs before the user_rf_pre_init. I commented everything out in the user_rf_pre_init, user_init and the init_done. Strange btw is that after this, I got more debug info on my serial line
Code: Select all
ets Jan 8 2013,rst cause:2, boot mode:(3,0)
load 0x4010f000, len 1384, room 16
rf cal sector: 508
freq trace enable 0
rf : 00
rf : 00
rf : 00
SDK ver: 2.1.0(deb1901) compiled @ Oct 23 2017 17:58:03
phy ver: 1136_0, pp ver: 10.2
mode : null
I still have the problem.
There are several APIs like
But if the problem occurs before user_rf_pre_init this is a case for a github issue for sure.
Did you flash the latest esp_init_data_default.bin?
Recently they changed something, so there is a new version "8":
https://github.com/espressif/ESP8266_NO ... master/bin
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