dBm country code question (CH)

[blinton]

Dear all,

For channels 36 - 64 (5150 - 5350 MHz) for CH it is allowed to use 23 dBm (200 mW) for indoor use according to this link (p9):

factsheet_wlan.pdf

However, in openwrt I can set 23 dBm for channels 36-48, but only 20 dBm for channels 52-64.
I found this link for openwrt which is different to the link from the CH governmental standards.
https://git.kernel.org/pub/scm/linux/kernel/git/sforshee/wireless-regdb.git/tree/db.txt?id=HEAD

Did I miss something or can I switch to another country to be able to set 23 dBm but still being within country standards (I live in) ?

Thanks in advance ! and Cheers, Blinton

[brada4]

Rather interesting, also UK adds some freedoms to ETSI guaranteed minimums
Either way you should communicate here:
https://wireless.docs.kernel.org/en/latest/en/developers/regulatory/wireless-regdb.html#sending-updates-to-the-regulatory-database

Indoor/outdoor is determined by 3rd letter of country code
CH - indoor or outdoor
CHI - indoor
CHO - outdoor
XXX - special value where channel map in supposedly international waters/airspace is given by AP

If you really have outdoor (weatherproof) AP you must set CC3 to O and get the ETSI base 20dBm.

Probably worth mailing/calling them whether extra power is intended.

[janh]

@blinton

but only 20 dBm for channels 52-64.

These channels (or specifically the frequency range 5250-5350 MHz) only allow the highest transmit power if TPC (Transmit Power Control) is used. Otherwise it has to be reduced by 3 dB (see section 6.1 of the document you linked).

As far as I know, TPC is not implemented, so wireless-regdb has to choose the second option.

@blinton

Did I miss something or can I switch to another country to be able to set 23 dBm but still being within country standards (I live in) ?

So the answer to that is no.

Also, be aware that the selected country code is included in the beacons sent by the access point.