Doubts about Archer C7 v2

Im not sure. On 2.4Ghz it is, in iperf, half of 5ghz net. But if i try do download from a fast FTP i get 200Mbit down, dosent matter 5 or 2.4Ghz.


Finally saturday I installed LEDE firmware in my Archer C7 v2.
Rigth now everything seems to work fine, but the wifi gave me more speed in the official TP-Link firm that in the LEDE firmware.

I tested the wifi speed before changing to LEDE, and now it's just a little slower than before.
I'll continue testing my wifi over the week to be sure of that "lost" of speed.

For me it's not a problem, but I think is good no know it.

Thanks a lot,

The "lost" of speed it was about a bad configuration on my router (my mistake).
Now AC Wifi is on 80 Mhz. and working like a charm!!!


On the 2.4 Ghz. wifi interface I had to add the option noscan '1' to make it work at 40 Mhz.
By default was working at 20 Mhz. instead of 40 Mhz. I had configured on the interface.

I think that's and old bug reported.


Hmmm, we have to set this noscan option? Anything else?

Thats what i see with noscan 1. Without there are no changes??

root@Archer-Lede:/etc/config# iwinfo wlan1 info
wlan1     ESSID: "just2confuse"
          Access Point: E8:DE:**********
          Mode: Master  Channel: 6 (2.437 GHz)
          Tx-Power: 23 dBm  Link Quality: 70/70
          Signal: -38 dBm  Noise: -92 dBm
          Bit Rate: 41.1 MBit/s
          Encryption: WPA2 PSK (CCMP)
          Type: nl80211  HW Mode(s): 802.11bgn
          Hardware: unknown [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy1

On the 2.4 Ghz. wifi interface I had to add the option noscan '1' to make it work at 40 Mhz.
By default was working at 20 Mhz. instead of 40 Mhz. I had configured on the interface.

I think that's and old bug reported.

It's not a bug.

According to the IEEE 802.11 specification, one has to scan for neighbouring Access Points prior to enabling 40 MHz channel width. If a neighbouring Access Point is found which might be negative affected by using 40 MHz width channels, it will not be enabled.

With noscan you are disable this check. Might give you more speed but most likely cause issues for surrounding wireless networks. Long story short: Don't do this, don't be a d***head!

Already with HT20 only four 2.4GHz channels can be used without having overlapping issues. With HT40 only two channels are left. Head to for a more detailed explanation.

What i do not understand atm. 70Mbit on 2.4Ghz are ???good??? I did not get more - tested with iperf3 and 2 Wlan clients. If start 2 oder Option "P" i stand at 70Mbit as max.

My computers on the 20 Mhz. were connected to 65 Mb., and changing to 40 Mhz. now are connecting to 150 Mb.
Tecnhically maybe is better to be on the 20 Mhz., I can't discuss that (I'm not an expert), but, if have a computer/mobile... capable to be working at 150 Mb. by wifi, is "stupid" going at 65 Mb.

That's my opinion, of course.

I get the info from here:

Forcing HT40 in the presence of other overlapping networks is not only creating problems for those networks, but also for yourself. HT40 is more fragile than normal 20 MHz wide channels, so the interference you inevitably receive from your environment has a much higher chance to introduce link disruptions than without it.

Every device working at 150 Mb. seems to be working fine right now (48 hours later).

If I detect some problems I'll post it here.

You need to be aware of the RF environment surrounding you. I live in a rural area, so there are no adjacent access points. If you live in town/city, you'll have neighbors whose access points may interfere.

My favorite tool for an RF survey is WiFi Analyzer from farproc. Free install from Android store. (Regrettably, iOS doesn't appear to allow the low-level access to the RF hardware to produce a similar tool without jailbreaking...)

Still working like a charm in the 40 Mhz. channels.
I will stay in the 40 Mhz. channels, no problems after more than a week on it.

Guys, I'm new to flashing routers and I just got LEDE on my Archer c7 so I can use openVPN. What other optimizations should I look into to increase speed/range of my router?

There is no need to touch anything else. If you stay in the 20 Mhz. without changing to 40 Mhz. will work fine indeed.
I changed to 40 Mhz. just for testing.

Wow, started to answer this long ago and got distracted.

Without buying better antennas and such, playing around with placement and adjusting the existing antennas on both ends is about all you can do. Use a good monitor as mentioned, go to your lowest interference channel option, and move around on both ends for best strength and speed.

If you try different antennas it's worth knowing that in the US at least, TP-LINK changed from the original internal 2.4Ghz and external 5Ghz antennas, to dual external ones. I have both. Opening the case will tell you. You'd want to buy 5Ghz only, or dual band ones, depending. Also, if you have the internal/external model, only moving the case will adjust the 2.4G, moving the externals will mostly affect the 5Ghz. Though at these short frequencies, many things nearby can effect the pattern.

I used openwrt trunk builds before and 5GHz was unstable compared to stock. Then I shifted to ubiquiti gear for a while. A week ago I installed LEDE 17.01.2 and it seems rock solid. I am using 20MHz on 2.4GHz and 40MHz on 5GHz. My speeds are as below, note that I am using my laptop which is only a 2x2 (Archer C7 v2 itself is 3x3 I think, I need a better wifi card in my laptop to extract more speed here, I guess):

[ 4] 0.00-30.00 sec 885 MBytes 248 Mbits/sec 0 sender
[ 4] 0.00-30.00 sec 883 MBytes 247 Mbits/sec receiver

2.4Ghz (highly congested in a 18 floor apartment!)
[ 4] 0.00-30.00 sec 317 MBytes 88.6 Mbits/sec 38 sender
[ 4] 0.00-30.00 sec 314 MBytes 87.7 Mbits/sec receiver

Hi @malahal,

Now I'm using the @r00t firmware and is working great!!

Take a look here:

Besides Qualcomm FastPath is included in the firmware (with many other improvements). You'll get better performance on Wifi/LAN speed.

Can I set the WiFi transmit power above 100mW with this firmware(s)?
The hardware can handle it?

As far as I know the wifi power is limited by the country settings.
I don't know if there is any way to bypass the limitation.