if this device can only HT20 modes, it means this device can't operate
at 802.11n mode with higher data rate?

I found that carambola using same SoC but it looks can use HT40.
http://r-ol.blogspot.co.id/2012/12/piratebox.html

CMIIW


> My understanding is that device has only one antenna, or at least the
> atheros chip is wired for only one antenna, meaning only HT20 modes.

> The PCB itself may have pads for two antennas depending on hardware
> revision (similar for product TL-WN703), but I've only seen parts populated
> for one antenna on the units I've opened up.  Probably because the device's
> plastic enclosure is too small for correct spacing between two antennas.


> On Thu, Nov 19, 2015 at 12:17 PM, Asriadi N <riyadi08 at gmail.com 
> <https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-users>> wrote:

>* Hello all....
*>>* I have read AR9331 data sheet and found several facts like Tx can one
*>* spatial data stream and Rx can two spatial streams for 802.11n. So I
*>* configure wireless radio like below :
*>>* config wifi-device 'radio0'
*>*     option type 'mac80211'
*>*     option channel '11'
*>*     option hwmode '11n'
*>*     option htmode 'HT40-'
*>*     list ht_capab 'SHORT-GI-20'
*>*     list ht_capab 'SHORT-GI-40'
*>*     list ht_capab 'TX-STBC1'
*>*     list ht_capab 'RX-STBC12'
*>*     list ht_capab 'DSSS_CCK-40'
*>*     option txpower '15'
*>*     option country 'US'
*>>>* But when I excute 'iw list' there is no TX-STBC1 but in data sheet show TX
*>* can send one spatial stream and RX can receive 2 spatial stream so I write
*>* TX-STBC1 and RX-STBC12 adjust with hostapd.conf for options at ht_capab.
*>>* am I wrong ? or there is opinion/advice for this case ?
*>>>* Sincerely
*>>* Riyadi*
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