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[Solved] 2.4 GHz WiFi no signal on 3 routers

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  • Level 16  
    Hello
    The problem with WiFi 2.4Ghz, after moving to a new apartment there was a problem with WiFi, but only 2.4GHz - 5GHz always works without a problem.
    The problem is that the TV (android) and two laptops only support 2.4GHz, if not for that, I wouldn't struggle with this WiFi.

    The first router "TP-LINK TD-W9980 N600", in the previous apartment worked without problems in both 2.4 and 5 networks after connecting in a new location for the first few moments (maybe 30 min) shows the 2.4 network, but in most cases it is impossible to connect it after which the network disappears (it doesn't send anything in the 2.4 band) - a reset to factory settings doesn't give anything.

    WiFi Analyzer (Android) shows neighbors 2.4 GHz networks (all packed on channel 11) and 5GHz networks together with my 5GHz network, the same inSSIDer running on Win10 with the "TP-LINK Archer T9E AC1900 Dual Band" card. I found that maybe during the move somehow the router was damaged (although it is only about 18 months old), I connected the never used ASUS RT-N66U via WAN to this TP-link, turned off WiFi in the TP link and everything started to work both Asus networks visible, can be connected to them, I found time for a new router. I bought TP-LINK Archer VR2800 and this is where the stairs start.

    After connecting a new router, both networks work, the router automatically assigns channel 11 for 2.4GHz, so I changed to a less loaded channel 2 and the network has been reset to factory settings and the same 5GHz problem works, 2.4GHz does not work - firmware update does not improve anything. Several times reset to factory settings and some time 2.4 is finally visible, or after the night in the morning I can see the 2.4 network on the phone - I found out from the fact that I am unlucky and just the equipment is damaged - I replaced it with exactly the same router and the problem remained. The router also has a problem with 2.4GHz, which at the end of the time the 2.4 network shows up and I can connect to it.

    In the meantime, when I replaced the router, I plugged the ASUS back in and the 2.4 GHz network died - the same case as with the TP link repeatedly resets and the ON / OFF network finally visible (but the problem is with the connection) as soon as I try to connect the network disappears.

    I have turned off everything in the whole house - cordless telephone - all BT devices, even power strip - filtering (it is already old) Routers are standing in an empty room away from any other devices, I turned off the fridge for a moment to make sure that it is not sifting any interference , the problem remained. I wonder if by chance all these routers are not damaged in some way at the moment (only what they would do) - I will try to connect the router in the garage today to check what is happening with this 2.4GHz.

    If any of the forum members have any suggestions, I would be grateful. I found the following information on the internet

    "Old TVs

    Not only new gadgets can generate interference. Fun fact from the UK: Internet service provider had to buy a TV for one man. It turned out that his old CRT TV was blocking the Wi-Fi signal for the whole area. The culprit was mainly the power supply from the TV, but you could not simply replace the power supply. The signal was blocked within a 200-meter radius. "

    I'm fed up with old-fashioned neighbors on both sides, but do I have such bad luck? on the other hand, I can see 2.4 GHz networks from neighboring buildings, screaming Screenshots after returning home

    The whole thing happens in the UK, street of "semi-detached" houses
  • Moderator of Networks, Internet
    Show those measurements you made, also upload a description of which router.
  • Level 16  
    TP-LINK Archer VR2800
    after a few hours there was a 2.4GHz network - and I could easily connect to it
    2.4GHz
    2.4 GHz WiFi no signal on 3 routers
    5GHz
    2.4 GHz WiFi no signal on 3 routers
    settings on the router
    2.4 GHz WiFi no signal on 3 routers
    2.4 GHz WiFi no signal on 3 routers

    as soon as I change the channel or anything in the 2.4 GHz WiFi network is lost
    2.4 GHz WiFi no signal on 3 routers
    2.4 GHz WiFi no signal on 3 routers

    I do not know if this is the case but after the reset the router sets to Auto (6) selects channel 6 and on this channel (as well as on any other than 11) the network never appeared - only when the router switches itself to AUTO (11) then 2.4GHz on CH11 is available

    Router settings (current) - 2.4GHz network has appeared on CH11
    2.4 GHz WiFi no signal on 3 routers 2.4 GHz WiFi no signal on 3 routers 2.4 GHz WiFi no signal on 3 routers
    2.4 GHz WiFi no signal on 3 routers 2.4 GHz WiFi no signal on 3 routers 2.4 GHz WiFi no signal on 3 routers 2.4 GHz WiFi no signal on 3 routers
  • Moderator of Networks, Internet
    Set a specific channel on the router, e.g. 1 no and 40MHz channel width. The fewer "auto" settings the better.
  • Level 16  
    I agree with them AUTO, the better - but with the CH1 CH2 or any other setting, there is no chance for 2.4GHz WiFi, even if the CH11 setting is fixed, I can wait 5 hours and this network will not appear - only appears when Router is set to AUTO (6) and changes itself to AUTO (11)

    ASUS and the other TP -LINK probably do the same.
  • Moderator of Networks, Internet
    I have no idea what's going on there.
  • Level 16  
    after I experimented a bit with the channels and it looks like the lower 2.4 band is something disturbed

    CH09- Channel Width: AUTO
    2.4 GHz WiFi no signal on 3 routers
    CH10 - Channel Width: AUTO
    2.4 GHz WiFi no signal on 3 routers
    CH12- Channel Width: AUTO
    2.4 GHz WiFi no signal on 3 routers
    CH13- Channel Width: AUTO
    2.4 GHz WiFi no signal on 3 routers
    CH13- Channel Width: 40MHz
    2.4 GHz WiFi no signal on 3 routers

    the moment it wants to set something below CH9 the network is raining - it is not on CH1-CH8

    there are no high / low voltage lines in the area, but there is a railway line - I know some of the traction is run down the UK in the rail, can it be affected? WiFi is quite high frequency
  • Helpful post
    Moderator of Networks, Internet
    If the wifi network behaves identically on these 3 routers (I think you have checked) then you need to look now for what generates these interference. Start with home devices and turn them off from power one after the other, then check with the scanner whether anything appears,
  • Level 16  
    That was my first approach, I turned off dosing everything, all the lighting, the fridge, everything after BT, a mobile phone, it did not work, it must be quite a big disturbance in the lower 2.4 GHz band it will be hard to determine. For now, the network is flying on channel 13 with 40MHz width and when I turn it on I turn off the router, it appears immediately, as soon as I go lower than CH9 2.4GHz it rains. Unless someone from the neighbors actually has some old TV that is sucked well, but I don't think I will knock from door to door because I don't get what I'm talking about. What kind of sade would I have to capture in a spectrum analyzer - if it exists? I have access to an analyzer up to 30 GHz.
  • Helpful post
    Level 27  
    Not only WiFi devices can work in the 2.4 GHz band. The spectrum analyzer will prove this to you.
    In the area you have ISM or video monitoring or radio links in the band. Since all WiFi is cut in several channels, the signal from these devices is strong, it works more than one in neighboring channels.
    Make and upload scans.
    Adjacent WiFi devices do not cause such problems. In WLANs there are mechanisms of competition for access to media, transfer / connection can be limping but something will always work. WLAN with another radio device does not get along.
  • Level 16  
    Unfortunately, it was not possible to track what the WiFi signal is interfering with, I chose to ch13 and to this day there are no problems with it - the topic is closed