Solla-topee wrote

  Hi @nyonyo 

If possible, when test the speed,  it is recommended to locate router and Range extender are on the same floor. 

They are on the same floor

 

5Ghz due to its higher frequency, the Wi-Fi range is shorter than 2.4Ghz, the 5Ghz signal can be weak if the extender is very far from the dual-band router. 

You could also try a different 5Ghz channel like channels 36/40/44/48 or select a relatively clean channel and see if that makes any difference. 

The RE200 is only 15 ft away from the router

 

Test on different network client like a laptop/ computer. 

I have tested on 2 cellphones and a tablet, don't have laptop at this moment

 

If still the same, can you test how much 5Ghz speed from router at the location where the extender sits. 

Approximately full speed +/-30Mbps

 

What is the 5Ghz speed of Extended network and 5Ghz link speed. 

The extender 5GHz speed is 433Mbps and the link speed/network speed i got on my cellphones is full 433Mbps, it is the internet speed (download) that drops drastically, upload is still about the same +/-10Mbps

 

Can I know the network topology as well, thank you. 

Router in the bedroom and extender in the living room, internet speed was measured next to the extender with the bedroom door wide open

 

  @nyonyo 

5GHz

2.4GHz

Solla-topee wrote

• You could also test a different 5Ghz channel on the Wi-Fi router and see if that makes any difference.
• how to change channel?
• 
• Please confirm RE200 is on the latest firmware : select hardware version and check if there is newer firmware 

https://www.tp-link.com/support/download/re200/

I already have the latest firmware, I did it via Tether, it is even newer than the latest on the web 

Firmware version: 1.0.8 Build 20210916 Rel. 59255

Hardware version: RE200 v.4.0

Initially the default firmware didn't support onemesh, but after I upgraded it works just fine with Archer C80

 

To look into this further, can you share a photo of the 5Ghz speed of router at the location of range extender as well

Router ZTE 670L 5GHz exactly at where the RE200 sits

May I know the model of router & the network map : e.g. do you have ISP

Router/modem: ZTE 670L, ISP: indihome, I live in Indonesia

-- router model X <wireless> RE200 ? 

Firmware & hardware version of the RE: 

Firmware version: 1.0.8 Build 20210916 Rel. 59255

Hardware version: RE200 v.4.0

Btw,  when did you purchase the RE200, did the 5Ghz Wi-Fi speed work fine as before?  

I used to give the same name for 2.4 & 5 GHz so I don't know whether I was connected to 2.4GHz or 5GHz

  @Solla-topee Sorry to say but this is the fact, after changing the channel to 36, the RE200 works just fine, but another problem arises, besides RE200 I also have Archer C54 set as a range extender, the Archer C54 worked very well when the router was on auto channel, I got full 30 Mbps 50 ft from it, after I changed the router's channel to 36 the RE200 works fine, but the Archer C54 drops speed, just like the RE200 did when the router was on auto channel, very confusing, why the two behave differently to different channels 

I always get the full 30Mbps wirelessly connected to the router 5GHz, whether it is on auto or channel 36