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Can't get 5 GHz back on E4200

Discussion in 'Tomato Firmware' started by ithrowpicks, Dec 4, 2011.

  1. ithrowpicks

    ithrowpicks Networkin' Nut Member

    I am not sure when the problem first occurred but I am going to assume it was after I tried to add a guest network on my E4200. Prior to this I was successfully using a single 5 GHz SSID for all 3 wireless devices in my home (laptop with Intel wifi 5300, Android cell phone, DLink DAP-1522 bridge mode)

    When it was working the router was using channel 149 (Auto setting) because there are no other wireless N devices near my home. A site survey showed only wireless G access points on the usual lower channels

    Now no matter what I do to force the 'Radio Band' option to 5 GHz it goes right back to 2.4 and channels 1, 6, or 11

    When I configured the networks I used a different SSID for each with different passwords but both used WPA2+AES.

    The attached screenshot show all the current settings
  2. ithrowpicks

    ithrowpicks Networkin' Nut Member

    Not sure what the problem was but I did an NVRAM reset and then installed the latest build and all is well now...

    One thing I did notice before the new flash was on eth2 2.4 only channels 5-11 showed up after doing a scan. Channels 1-4 would not show up.

    I think I am going to back down the transmit power from 60 to 42 just to be safe.
  3. Dr Strangelove

    Dr Strangelove Networkin' Nut Member

    Running Tomato Firmware v1.28.2492 MIPSR2-Toastman-VLAN-RT-N K26 USB VPN on a Linksys E4200v1.

    2.4Ghz and 5Ghz both seem to operating fine using 60mW.

    The gains at 60mW from 42mW are only in the range of +/-3dB

    For me there has been no noticeable changes in signal strength/throughput on the Linksys E4200 over the different Toastman versions.
    To be honest, I haven't always checked throughput on each version I've used.

    On 2.4Ghz @ 15m I get a consistent -63dB +/-3dB as seen by inSSIDer.

    Transfer rate of ~75Mbps on 2.4Ghz at 15m
    Transfer rate of ~55Mbps on 5Ghz at 15m

    These test were done using channels 1+5 (40Mhz) with overlap on channel 5 from a neighborhood router on channel 6 at -85dB.
    40Mhz 5Ghz with not another sole in sight. ;)

    As the Alienware notebook I use has a 2 wire built in antenna in the monitor housing the notebook needs to be positioned correctly for best reception when testing. Anything less than optimal the signal can drop by 5dB. Obviously using something like a 3 wire antenna and a Bigfoot Killer 1103 WiFi mini-card would vastly increase the signal/transfer rate of my WiFi to the Linksys E4200.

    Using a 'really' old Toshiba Portege with an external 802.11n 150Mbps USB thumb Wifi (which IS smaller than my thumb) and Netstumber we see peaks of -62dB and lows of -70dB at 15m with an approx average of around -68dB.

    HOWEVER, it we connect the USB WiFi thumb drive to a Targus passive 4 port external hub with the uplink cable coiled 4/5 times we see signal peaks of -58dB and an average of ~-65dB at 15m.

    Have an Android 802.11g phone which gets peaks of -68dB and lows of -80dB at 15m in the same location.
    Have a Samsung Cortex-A8 S5PV210 'Desktop' 802.11n Android coming which will be position at 15m too

    My testing layout is as seen below:


    My phone can detect my E4200 2.4Ghz signal ~60m down the street, thought this signal is not usable on the Android phone.

    On my Android devices I choose to use WiFi Analyzer 2.5.16 by Kevin Yuan.

    If one is monitoring WiFi signal strength and etc with inSSIDer consider the following:

    Don't do data transfer bench tests with inSSIDer running as it can reduce the transfer rate by 2/3.​
    This also applies to general usage. So don't leave inSSIDer running unless you're monitoring something.​

    Some times with inSSIDer running you may not be able to reconnect to a WiFi AP. In this case just close inSSIDer reconnect and then start inSSIDer again.​
  4. eahm

    eahm LI Guru Member

    Nothing personal but I've always had problems with Toastman and WiFi. Try Shibby mod
  5. pharma

    pharma Network Guru Member

    Trans power of 60 should be fine. I've been running mine at 59 for 7 months now with no problems. Below are some screen shots of my Advance wireless settings to give you an idea of areas you might want to tweak.
    Advanced wireless settings:
    2.4 ghz
    5 ghz

    Basic wireless settings:
    2.4 & 5 ghz
    I found playing with my channels (primarily 5 ghz) will affect signal strength for both 2.4 & 5 ghz radios.
    Hope this helps! :)

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