[OpenWrt-Devel] QCA9994 outdoor 13km link

[Koen Vandeputte]

On 25.09.19 17:14, support at maxnet.al wrote:
> This is long distance, 5km with 4 dishes on each side. They are all 
> vertical and all chains have signal range -60 to -65.
>
> I don't have omni antennas. Is there a problem that i am using dishes?
>
>
I run dozens of long-range devices, and I'm seeing 2 issues in your setup:

1)

- Ack-to issues kick in starting from roughly 1000m.  When you cannot 
alter ack_to (coverage class), you will notice severe performance issues 
above 1000m

2)

- Using identical polarization on all chains is an absolute performance 
killer.

I have 2 devices,  both 2x2 802.11n, HT40 SGI, which are only 150m 
apart, all chains V polarized.

When running speedtests, inspecting ath9k rate control shows it is stuck 
at the max speed for 1 chain (iso 2)

In my case it means the absolute link rate is 130Mbit iso 270 in this 
configuration.

I can imagine using 4 chains will even reduce performance a lot more.

You should really try to use use H + V+ (-45) + (+45).

Also, ensure radio's at both sides have the chains on identical 
polarization. (Chain0 - V,  Chain1 - H, ..)


Regards,

Koen

>
> On Wed, Sep 25, 2019 at 5:11 PM +0200, "Ben Greear" 
> <greearb at candelatech.com <mailto:greearb at candelatech.com>> wrote:
>
>     Is this short distance or long?
>
>     Please try short distance with omni antenna first to make sure you are not hitting the delayed-ack issue
>     or problems with your antenna.
>
>     Change your antenna orientation so that they point in different directions.
>
>     Thanks,
>     Ben
>
>     On 9/25/19 6:49 AM, support at maxnet.al wrote:
>     > Hello,
>     > 
>     > Today i managed to connect the station wds at 80MHz channel. Signal is -56 and i have very low datarates. I have attached a photo.
>     > 
>     >   When station was ddwrt and AP openwrt the datarates were 866/433. TX won't do more than VHT-NSS 1 although RX it's not good either because it's a 4 chain 
>     > radio and it should do VHT-NSS4.
>     > 
>     > Thank you,
>     > Klevis
>     > 
>     > 
>     > 
>     > 
>     > On Mon, Sep 23, 2019 at 6:36 PM +0200, "Ben Greear" > wrote: > > Weeks or months or whenever I have time, and maybe
>     sooner if someone > wants to sponsor it. Please understand I, and
>     probably everyone else working > on OpenWRT, am busy with lots of
>     other projects and community work often > gets pushed to the back
>     burner. > > Thanks, > Ben > > On 9/23/19 8:18 AM,
>     support at maxnet.al wrote: > > Hi Ben, > > > > When do you think you
>     might be able to make those changes to your driver? > > > >
>     Thanks, > > Klevis. > > > > > > > > On 2019-09-20 13:00, Ben
>     Greear wrote: > >> On 9/20/19 12:55 PM, Vincent Wiemann wrote: >
>     >>> Hi Klevis, > >>> > >>> have you tried it with a short
>     distance? > >>> If you did you should better ask Ben Greear
>     directly. > >> > >> I asked him to post publicly so that others
>     can help answer and that > >> my own answers might > >> help
>     someone else. > >> > >> I have some patches that should enable
>     coverage class settings for > >> wave-2, but I am too busy > >>
>     with other things right now to port them to my ath10k-ct
>     driver/firmware. > >> > >> Thanks, > >> Ben > >> > >>> > >>> By
>     the way ath10k gen 2 chipsets don't work very well with long
>     distance links without a > >>> special feature which
>     implementation is only available to companies like Ubiquiti and
>     very few > >>> people who have an own reverse-engineered
>     implementation. > >>> It works on IPQ401X, QCA9886 and QCA9888
>     based chips only. > >>> > >>> And it is not possible to set a
>     coverage class for gen 2 devices, yet as far as I know due to
>     missing > >>> documentation and implementation (correct me if that
>     information is outdated). > >>> Furthermore a high channel width
>     often results in problems > >>> due to lower receiver sensibility.
>     > >>> We have better experiences with lower channel widths and
>     sometimes get more throughput with that. > >>> > >>> Actually I
>     think this does not explain your connection issues as 13 km is not
>     that much. > >>> > >>> Regards, > >>> > >>> Vincent Wiemann > >>>
>     > >>> On 20.09.19 18:30, support at maxnet.al wrote: > >>>> Hello
>     everyone, > >>>> > >>>> I am trying to setup a custom made outdoor
>     link with Apu2d2 board devices and QCA9994 cards from compex.
>     After i installed openwrt and ath10k ct driver, > >>>> kmod ath10k
>     and board-2.bin the device can run a 80MHz channel in WDS AP. The
>     problem is that it won't run as station or station wds. It can
>     scan > >>>> the SSIDs but won't connect them. > >>>> > >>>> Any
>     suggestion? > >>>> > >>>> Thank you! > >>>> Klevis > >>>> > >>> >
>     >>> _______________________________________________ > >>>
>     openwrt-devel mailing list > >>> openwrt-devel at lists.openwrt.org >
>     >>> https://lists.openwrt.org/mailman/listinfo/openwrt-devel > >>>
>     > > > > > -- > Ben GreearCandela Technologies Inc
>     http://www.candelatech.com > -- Ben Greear Candela Technologies
>     Inc http://www.candelatech.com
>
>
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