Identical hardware, but different maximum transmit power - Why?

In all of EU 80MHz channels:
CH36 - 23dBm
Ch52 - 20dBm dfs
Ch100 - 26dBm dfs
Ch116 - 26dBm dfs
...
Others - 13dBm
You can verify using iw list

Channel 157 is 5775 to 5795 MHz (or even wider depending on selected BW). That is not in your table. Trust me the lack of power is because of legal limits in your country.

In the selection box above where you select the power you can select the channel. Put that to 36 or maybe 116. Save and Apply. Then try to change it again

It is in the iw reg get 25mW 13dBm
Enjoy connection 1m from router when air is dry.

Yes, so change channel and the limit will go up


It is actually the case that access points in AUTO mode always select channels that are limited to 13dB.

I have now set channels 100, 108, 116, 124, 132... now ALL have 26dB.

Is there anything wrong with these channel settings?

The option channels '36 100 108 116 124 132' can be saved in config/wireless
You need one non-dfs fallback orcidentical AP in 2.4GHz band.

Yes, 26dBm (400mW) is too loud. Most endpoints would have transmit powers closer to a max of 16-20dBm (40mW-100mW.)

As signal propagation doubles with each quadrupling of output power (6dB increase), your AP will have 2-4x the coverage distance of your endpoints, almost certainly resulting in generally poor performance and - if you're using multiple APs - significant problems in roaming between APs.

If you're not getting enough coverage when setting the APs somewhere around the 18-21dBm transmit power range, consider adding more APs rather than bumping up power.

(Edit: I should probably say 18-21dBm EIRP, which would translate to 12-15dBm transmit power, considering the 6dBi 5GHz antenna in an AP55C.)

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Could this be the cause? - When I stream small videos, they stop after a few seconds, then it takes longer (5-10 seconds) for them to reload and continue playing. This was not the case before the conversion to OpenWRT... with the same hardware and full reception on the end device

run tcpdump/wireshark , does not sound like wifi problem.

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