C15 on the poorly performing modules is either bad or misvalued, I don't have a capacitance meter with enough resolution at home to check what the values are but if C15 is removed the units with poor performance get back to full speed albeit with slightly spotty reception, so clearly a replacement v...

Bit of an update, about half of the units with low speed responded positively to having the Flash reset to cause an RF recalibration but the half is stubbornly refusing to play ball and remain at the slow speed, I will try the idea mentioned about swapping CPU's from a good board to a bad board to s...

Ohh, almost forgot, I am working in the PlatformIO Arduino environment, any way to get the Audrino implementation to force a calibration on every re-boot?

Hurray! I erased the devices Flash to force an RF calibration and job done, all the bad units are now performing at full speed. Thank you very much people, excellent diagnostic skills and thank you for a pleasant support experience, staffers and dedicated enthusiasts alike well done. Thanks for all ...

Hi Angus, Thank you for that reply, I'll get right on the calibration option, never even knew that was a thing, so I am crossing my fingers that's it, I'll get the Raw Wifi capture environment setup today. The SD card write gets skipped over if the unit does not detect the SD card but I have physica...

From the Wireshark log it looks like for the good one the ack is coming in a few ms but the other the ack is taking 100ms possibly due to retries. Have you reproduced this with different access point types? Also does your test firmware do full rf calibration every boot? Hi WiFive, Yes I have variou...

I did a quick check of power, both good and bad pull ~150mA when receiving, but I will put the LDO through its paces and check for ripple and transients. I'll see if Angus has any more thoughts after reading my posts and then get to more... old school methods, your idea about swapping the esp chips ...

Great idea WiFive, sadly no clock issues with good or bad modules, generated a 10Khz, 100Khz, 10Mhz and 40Mhz pwm they are all rock solid and spot on frequency wise.

Cheers I'll give that a try and scope the output, I guess the bigger issue is, is this going to be a pre-screening requirement for large production runs, the additional hands-on cost of pre-qualifying modules manually and the additional time that may incur due to moisture control considerations coul...

Just realized I missed a question regarding reflow, we used the recommended profile as per the espressif esp-wroom-32 module datasheet in a HELLER 1826MK5 for the 10 test boards, the other 100 tested were done without reflowing and just placed in an esp32 module test jig in the same faraday enclosur...