TP-Link Archer C9 Thread

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MolaMola
DD-WRT User


Joined: 07 Mar 2013
Posts: 63

PostPosted: Mon Mar 25, 2019 7:57    Post subject: Re: C9v1 what settings in Wireless are recommended? Reply with quote
boris03 wrote:
There are settings for explicit beamforming, implecit beamforming, TurboQam, Currently all deactivated.

What is supported by this device and what should I activate?

Thanks

You can enable all of those although beam forming doesn't make a measurable difference in my case.

There's a lot of misinformation and misconception around beam forming. Many sources claim it does something with the direction of the radio signal as in it would somehow reshape the spherical distribution of the transmission out of every antenna. Of course this is bogus because omni directional antennas are just that and nothing in their construction allows that to be changed by software alone. Rather beam forming has something to do with changes in phase and polarity differences between 2 or more antennas effectively changing the interference pattern. This technique has been in use in large specialist radio stations for decades. It's only fairly new stuff in the wifi domain. It might make a difference in your situation so I'd just give it a try.

I have my 3 antennas pointing perpendicular to each other, effectively as the x, y and z axis of a Cartesian system, by simply pointing the 2 outer antennas outwards so they are in a 90 degree angle from each other, and the middle antenna pointing forward and perpendicular to the 2 outer antennas. This seems to help more than any changes in the software. Perhaps beam forming requires all antennas to be in parallel but I don't know enough about it to make any valid claims. But enabling all these features doesn't seem to do any harm anyway so go ahead and try all of them.


Last edited by MolaMola on Mon Mar 25, 2019 8:10; edited 1 time in total
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boris03
DD-WRT User


Joined: 17 Jan 2019
Posts: 92

PostPosted: Mon Mar 25, 2019 8:09    Post subject: Reply with quote
That sounds reasonable, thanks a lot for this summary. I played around already and also noticed not a big difference with these options on or off, maybe this explicit bf was increasing WiFi when further away.
But adjusting antennas is best. I changed left and right to 45 degree, this definitely improved the 90 degrees I cannot use- my wife says looks stupid Very Happy
MolaMola
DD-WRT User


Joined: 07 Mar 2013
Posts: 63

PostPosted: Mon Mar 25, 2019 8:14    Post subject: Reply with quote
Welcome. Besides.. antennas have a swivel for a reason. Very Happy
fhcat9
DD-WRT Novice


Joined: 03 Apr 2019
Posts: 2

PostPosted: Wed Apr 03, 2019 3:05    Post subject: Reply with quote
I have a TP LINK Archer C9 and flashed it to : DD-WRT v3.0-r29409 std. It works fine but the USB storage function is not quite working. No matter what USB stick I plug in, it does not recognize it. And I have tried both USB 3.0 and USB 2.0 ports with no luck.

Does any one have any suggestions?
fhcat9
DD-WRT Novice


Joined: 03 Apr 2019
Posts: 2

PostPosted: Tue Apr 09, 2019 17:49    Post subject: Reply with quote
Just to answer my own question, I upgraded the router to latest DD-WRT build 10.10.2018 and it works fine with my USB sticks. I am not sure it was the upgrade or the reboot fixed the USB issue though.

fhcat9 wrote:
I have a TP LINK Archer C9 and flashed it to : DD-WRT v3.0-r29409 std. It works fine but the USB storage function is not quite working. No matter what USB stick I plug in, it does not recognize it. And I have tried both USB 3.0 and USB 2.0 ports with no luck.

Does any one have any suggestions?
Gradius
DD-WRT Novice


Joined: 11 May 2013
Posts: 38

PostPosted: Fri May 03, 2019 5:31    Post subject: Reply with quote
Hi,

I'm using DD-WRT v3.0-r39654 std (04/25/19) and I'm getting very SLOW speeds on internal tests.

The test I performed between my workstation PC <> firewall <> Archer C9 v1 <> Galaxy S8.

I have turned off the firewall on Archer (for obvious reasons), and put my REAL firewall into DMZ on TP-Link.

I remember to get over 500Mbit/s, now I just can't pass 250Mbit/s mark.

Using UDP I managed to get around 400Mbit/s.

Of course, I'm using AC band and 80MHz (VHT80), Ch 149.

Also, I'm using the same software I used years ago:
https://bitbucket.org/pzolee/tcpserver/downloads/

On Android:
https://play.google.com/store/apps/details?id=com.pzolee.android.localwifispeedtester

Check it out.
jansen_al
DD-WRT Novice


Joined: 15 May 2019
Posts: 1

PostPosted: Wed May 15, 2019 18:13    Post subject: Very Slow Wifi and Lan tests for internet speed.... Reply with quote
Hi Gradius,

Having the same very slow local and wifi speeds with firmware: DD-WRT v3.0-r39572 (04/19/19) Archer C9V1.
Tried almost everything. I"ll updated from stock to this build. I know it was fast on the stock firmware....
Been reading a day long in the forum and afraid to go back to stock and brick my router. Shocked
Btw the speed on Wifi as on cable is 9,33 mbps down and 9,33 mbps up? Confused Confused
Anyone having ideas how to fix this????
mosbz99
DD-WRT Novice


Joined: 22 Jan 2019
Posts: 3

PostPosted: Thu May 23, 2019 16:25    Post subject: Re: Very Slow Wifi and Lan tests for internet speed.... Reply with quote
jansen_al wrote:
Hi Gradius,

Having the same very slow local and wifi speeds with firmware: DD-WRT v3.0-r39572 (04/19/19) Archer C9V1.
Tried almost everything. I"ll updated from stock to this build. I know it was fast on the stock firmware....
Been reading a day long in the forum and afraid to go back to stock and brick my router. Shocked
Btw the speed on Wifi as on cable is 9,33 mbps down and 9,33 mbps up? Confused Confused
Anyone having ideas how to fix this????


I happened to me, I did try another versions until fixing the speed.
mondc10
DD-WRT Novice


Joined: 28 Mar 2018
Posts: 10

PostPosted: Tue May 28, 2019 7:28    Post subject: is jffs working for v3 running on latest beta Reply with quote
Good day folks! I have archer c9 v3 and would like to use the ad blocking that is implemented via USB, however it entails to enable jffs.

My question is that is the issue mentioned on the c9 wiki for v3 devices still apply on the r39827 build? I am hesitant to try it as it is on bold letters

WARNING: Enabling JFFS bricks the router: "That seems to nuke all the way up to 0xFEFFFF in the SPI flash."

appreciate your feedback!
RyzenMonsenhor1984
DD-WRT Novice


Joined: 04 Jun 2019
Posts: 2

PostPosted: Wed Jun 05, 2019 0:31    Post subject: Reply with quote
Guys, i need a little help with my C9 V4.
I’ve been postponing this update for a while, just waiting for the warranty to expire on my C9, and i casually remembered doing this yesterday since the stock firmware on the router messed up after a power shortage and deleted the previous settings i already had.
Well, i already run a secondary router (D-Link DIR-868L) as a wireless AP with DD-WRT and it has been working very well for over a year and a half, turning it into a DD-WRT router was no hassle at all, i just followed the procedures on the wiki and its been perfect since, recently i learned about mesh networking with OLSR and i wanted to try it out.
I’ve been trying to pick the files from the device list which seems to be correct, but all i get when i try to flash this file is an “unable to upgrade” message on the stock UI.
I did notice one thing about this, my C9 is an american model which has a larger sized stock firmware in comparison with the one DD-WRT provides, which itself is similar in size to the european stock firmware.
Could that be the reason for me not being able to update the firmware?
I tried multiple versions as well, just to make sure and the same thing happens, reseted it via UI and doing the 30-30-30 method as well.
gspbeetle
DD-WRT Novice


Joined: 27 Sep 2017
Posts: 2

PostPosted: Sat Jun 15, 2019 11:00    Post subject: Reply with quote
Tried a lot of the new builds, but r35452 is still the most stable build for me, performance wise.
https://dd-wrt.com/support/other-downloads/?path=betas%2F2018%2F03-20-2018-r35452%2F
Any other build suggestions?
boris03
DD-WRT User


Joined: 17 Jan 2019
Posts: 92

PostPosted: Sat Jun 15, 2019 11:18    Post subject: Reply with quote
I am noticing wlan performance problems with r4... So went back to latest r3... Still wlan problems. Anyone else having this problems?
Mine is a c9 c1900
boris03
DD-WRT User


Joined: 17 Jan 2019
Posts: 92

PostPosted: Sun Jun 16, 2019 12:48    Post subject: Reply with quote
gspbeetle wrote:
Tried a lot of the new builds, but r35452 is still the most stable build for me, performance wise.
https://dd-wrt.com/support/other-downloads/?path=betas%2F2018%2F03-20-2018-r35452%2F
Any other build suggestions?


Wow, but this is really old from March 2018 quite old?
Did you really try all versions and how did you get your result?

Thanks
armin_maleki
DD-WRT Novice


Joined: 21 Jun 2019
Posts: 1

PostPosted: Fri Jun 21, 2019 17:53    Post subject: Archer c9 Reply with quote
Hi
today im install DD-WRT on my archer c9
in stock firmware i can see Speed in wifi adapter 1.3 GB but when im install DD-WRT v3.0-r37305 std (10/10/1Cool my wifi adapter show me maxumum 600 MB... what am i doing now?



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erilidon
DD-WRT Novice


Joined: 02 Apr 2013
Posts: 11
Location: Carrollton, GA

PostPosted: Wed Jun 26, 2019 10:11    Post subject: Reply with quote
RyzenMonsenhor1984 wrote:

I’ve been trying to pick the files from the device list which seems to be correct, but all i get when i try to flash this file is an “unable to upgrade” message on the stock UI.


I'm having the same issue. I have a US Archer C9 v4 with Stock Firmware "1.0.1 Build 20171219 rel.57874(5553)". When ever I go to flash "factory-to-ddwrt" I get the error "Unable to Upgrade."

I've read over several posts and can't find a solution, thanks for any help.
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