according ar9331 datasheet, if we can't use HT40 it means we can't
achieve 150 Mbps data rate and only use data rate
from legacy (b/g). it is right ?

thanks for you link but I don't know if on this atheros chip is wired
for only one antenna but this link is interesting
(http://www.spinics.net/lists/linux-wireless/msg93735.html).
If we look pcb from mr3020 we can see that there is (maybe) 3 ground
antenna connected to J1, J4 and J2.

can we use it ?



> 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/ 
> <http://blog.eikeland.se/2012/09/15/better-wr703n-antenna-mod/>> 
> https://apollo.open-resource.org/lab:argus#modifications 
> <https://apollo.open-resource.org/lab:argus#modifications>


> On Fri, Nov 20, 2015 at 4:01 AM, Asriadi N <riyadi08 at gmail.com 
> <https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-users>> 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
<http://r-ol.blogspot.co.id/2012/12/piratebox.html>
*>>* CMIIW*
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