802.11n operation with a single antenna is still possible, i.e. higher data rates. Just the spatial and frequency multiplexing aren't available (hence HT20 only).
Here is more info about the PCB inside those TP-Link travel routers, for illustration. You can see photos of the MR3020 PCB with pads for a second antenna, but no parts populated. http://blog.eikeland.se/2012/09/15/better-wr703n-antenna-mod/ https://apollo.open-resource.org/lab:argus#modifications On Fri, Nov 20, 2015 at 4:01 AM, Asriadi N <[email protected]> wrote: > 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* > > > _______________________________________________ > openwrt-users mailing list > [email protected] > https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-users > > -- Ben West http://gowasabi.net [email protected] 314-246-9434
_______________________________________________ openwrt-users mailing list [email protected] https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-users
