[OpenWrt-Devel] ath9k: Max 3 dBi gain for FCC (365-ath9k-adjust-tx-power-reduction-for-US-regulatory-do.patch)

[Sven Eckelmann]

On Dienstag, 31. Juli 2018 10:57:03 CET Sven Eckelmann wrote:
> Hi,
> 
> I've just checked the FCC "antenna reduction workaround" patch [1] in ath9k. 
> The code uses twicepower (.5 dB unit used by QCA) and uses 6 (3dBi) as allowed 
> gain for FCC. The comment also states "FCC allows maximum antenna gain of 
> 3 dBi".
> 
> Where does the 3dBi come from? 15.247(b)(4) talks about 6 dBi [2]:
> 
> > (4) The conducted output power limit
> > specified in paragraph (b) of this section
> > is based on the use of antennas
> > with directional gains that do not exceed
> > 6 dBi. Except as shown in paragraph
> > (c) of this section, if transmitting
> > antennas of directional gain greater
> > than 6 dBi are used, the conducted
> > output power from the intentional radiator
> > shall be reduced below the stated
> > values in paragraphs (b)(1), (b)(2),
> > and (b)(3) of this section, as appropriate,
> > by the amount in dB that the
> > directional gain of the antenna exceeds
> > 6 dBi.
> 
> Btw. I am not sure whether all countries which use the FCC DFS rules also use 
> the same antenna gain limits. But let us assume for now that this is ok.
> 
> Kind regards,
> 	Sven
> 
> 
> [1] https://github.com/openwrt/openwrt/blob/81542331cb1827650f3abd69375d964d0ce2d050/package/kernel/mac80211/patches/365-ath9k-adjust-tx-power-reduction-for-US-regulatory-do.patch
> [2] https://www.gpo.gov/fdsys/pkg/CFR-2013-title47-vol1/pdf/CFR-2013-title47-vol1-sec15-247.pdf

Ping

Kind regards,
	Sven
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: This is a digitally signed message part.
URL: <http://lists.infradead.org/pipermail/openwrt-devel/attachments/20181128/38b0c8e9/attachment.sig>
-------------- next part --------------
_______________________________________________
openwrt-devel mailing list
openwrt-devel at lists.openwrt.org
https://lists.openwrt.org/mailman/listinfo/openwrt-devel