There were some replies to this, but I just noticed that the mailing list somehow got dropped. Bringing the discussion back to the list. On Mon, Feb 13, 2017 at 02:58:28PM +0100, Matthias May wrote: > On 07/02/17 15:04, Seth Forshee wrote: > > On Tue, Feb 07, 2017 at 08:52:30AM +0100, Johannes Berg wrote: > >> On Mon, 2017-02-06 at 14:50 -0600, Seth Forshee wrote: > >>> + (5150 - 5250 @ 80), (23), AUTO-BW > >> > >> For 20 MHz this is right, since the document says: > >> > >> The maximum e.i.r.p. shall not exceed 200 mW or 10 + 10 log10 B, > >> dBm, whichever power is less. B is the 99% emission bandwidth in > >> megahertz. The e.i.r.p. spectral density shall not exceed 10 dBm in > >> any 1.0 MHz band. > >> > >> However, for < 20 MHz, like 5 or 10, which we in theory do support, you > >> can't use that much due to the spectral density requirement. It seems > >> possible that that's where the 17 dBm came from, since 10 + 10 log10(5) > >> is about 17. > > > > Yes, thanks. I had forgotten to consider bandwidths less than 20 MHz. > > > > Seth > > > > _______________________________________________ > > wireless-regdb mailing list > > wireless-regdb at lists.infradead.org > > http://lists.infradead.org/mailman/listinfo/wireless-regdb > > > > According to .../include/net/cfg80211.h > > >static inline int > >ieee80211_chandef_max_power(struct cfg80211_chan_def *chandef) > >{ > > switch (chandef->width) { > > case NL80211_CHAN_WIDTH_5: > > return min(chandef->chan->max_reg_power - 6, > > chandef->chan->max_power); > > case NL80211_CHAN_WIDTH_10: > > return min(chandef->chan->max_reg_power - 3, > > chandef->chan->max_power); > > default: > > break; > > } > > return chandef->chan->max_power; > >} > > This looks to me like it already handles the reduction of power > according to bandwidth. Johannes, just wanted to confirm that based on this you no longer have any objection to the changes. Thanks, Seth
